EP2027946A1 - Method for manufacturing bands and films from TiA/6V4 - Google Patents

Abstract

The method for the production of superplastically deformable strip or foil out of alloy of titanium, aluminum and vanadium (TiAl6V4) with a thickness of more than 0.9 mm, comprises hot-rolling the strip with a forming grade of 30-80% at 800-1000[deg] C, thermally pretreating the hot-rolled strip at 700-800[deg] C under high vacuum of more than 13.3 mPa, and cold-rolling the hot-rolled and thermally pre-treated strip with a forming grade per single stitch of 3-7 %. The forming grade per single stitch is 1-15% to the strip or foil with a thickness of more than 0.9 mm. The method for the production of superplastically deformable strip or foil out of alloy of titanium, aluminum and vanadium (TiAl6V4) with a thickness of more than 0.9 mm, comprises hot-rolling the strip with a forming grade of 30-80% at 800-1000[deg] C, thermally pretreating the hot-rolled strip at 700-800[deg] C under high vacuum of more than 13.3 mPa, and cold-rolling the hot-rolled and thermally pre-treated strip with a forming grade per single stitch of 3-7 %. The forming grade per single stitch is 1-15% to the strip or foil with a thickness of more than 0.9 mm. After the hot-rolling, the TiAl6V4 alloy comprises a composition of aluminum (5.5-6.0 wt.%), vanadium (3.5-4.2 wt.%), nitrogen (less than 0.02 wt.%), carbon (less than 0.05 wt.%), oxygen (less than 0.15 wt.%), hydrogen (less than 0.01 wt.%), iron (less than 0.15 wt.%) and remnant of unavoidable pollutants and titanium. A mechanical pre-treatment of the hot-rolled strip is carried out before, simultaneous or after the thermal pre-treatment and comprises degreasing with a degreasing agent. The hot-rolled strip has a thickness of 1 mm. The cold-rolling comprises cold-rolling the hot-rolled and thermally treated strip with the forming grade of 30%, where the forming grade per single stitch is 1-15% to the strip or foil with a thickness of more than 0.9 mm, intermediate annealing the strip at 650-850[deg] C and cold-rolling the strip with the forming grade of 10-40%, where the forming grade per single stitch is 0.1-10 %. The final thickness of the strip and/or the foil is 0.1-0.3 mm after the cold-rolling process. An independent claim is included for a superplastically deformable strip or foil.

Description

The present invention relates to a process for producing a superplastic forming tape or a superplastic formable film of TiA16V4 having a thickness of not more than 0.9 mm.

Due to their good performance properties, such as very low density, high strength and excellent corrosion resistance, titanium alloys, such as TiA16V4, in many industries, such as aerospace, in the chemical industry, in medical technology and mechanical engineering, used. Depending on the use, different specific properties are required of the titanium alloys. However, the processability of materials made of TiA16V4 are limited, because TiA16V4, which consists of a mixture of the α- and the β-phase, has an extremely poor cold workability.

Materials made of TiA16V4 are often brought into the desired final shape by superplastic forming. Depending on the desired final thickness of the material more or less thick starting materials are required for this. However, TiA16V4 tapes or TiA16V4 foils less than 1 mm thick are not commercially available. In addition, the known methods for producing such TiA16V4 tapes or TiA16V4 films are very rote and associated with more or less major disadvantages.

From the US 4,838,337 For example, a method for producing titanium alloy films is known in which a powder having the desired composition is first plasma sprayed onto a metal foil before the formed titanium alloy deposit is separated from the metal foil, for example, by dissolving the metal foil in a nitric acid solution.

In the US 4,805,294 discloses a process for producing titanium alloy thin films by first plasma-spraying a powder of the desired composition onto a metal foil before separating the formed titanium alloy deposit from the metal foil and rolling the separated titanium alloy deposit is to reduce their thickness and improve the smoothness of the surface. However, this method is very expensive. In addition, this method can only be used to produce very small formats with partly faulty microstructures.

The object of the present invention is therefore to provide a method for producing tapes or films of TiA16V4 having a thickness of not more than 0.9 mm, which is quick and easy to perform and also superplastic well formable tapes or films with a uniform thickness and with a non-porous and smooth surface.

1. a) Warmwalzen eines Blechs aus TiA16V4,
2. b) thermische Vorbehandlung des warmgewalzten Blechs bei einer Temperatur zwischen 650 und 850 °C und
3. c) Kaltwalzen des warmgewalzten und thermisch vorbehandelten Blechs mit einem Umformgrad von wenigstens 30 %, wobei der Umformgrad pro Einzelstich zwischen 1 und 15 % beträgt, zu einem Band oder einer Folie mit einer Dicke von nicht mehr als 0,9 mm,

wobei das kaltgewalzte Band oder die kaltgewalzte Folie nicht endgeglüht wird.According to the invention, this object is achieved by a method for producing a superplastic-formable strip or a superplastic-formable film of TiA16V4 having a thickness of not more than 0.9 mm, which comprises the following steps:

1. a) hot rolling a sheet of TiA16V4,
2. b) thermal pre-treatment of the hot-rolled sheet at a temperature between 650 and 850 ° C and
3. c) cold rolling the hot-rolled and thermally pretreated sheet having a degree of deformation of at least 30%, wherein the degree of deformation per single stitch is between 1 and 15%, to a tape or a sheet having a thickness of not more than 0.9 mm,

wherein the cold-rolled strip or the cold-rolled foil is not finally annealed.

This solution is based on the surprising finding that a strip or strip is first hot-rolled by a process in which first a sheet of TiA16V4 is thermally pretreated and then cold-rolled to a thickness of not more than 0.9 mm with a specific degree of deformation ., a film of TiA16V4 is obtained, which (s) has an excellent superplastic formability, a uniform thickness and a non-porous and smooth surface. This was unexpected especially because TiA16V4 materials are known to have extremely poor cold workability. Furthermore, the tapes or films of TiA16V4 which can be produced according to the invention have a homogeneous microstructure. In addition, it has unexpectedly been found that the tapes or films of TiA16V4 which can be produced according to the invention are not enriched on their surface with the α-phase as much as the TiA16V4 materials known from the prior art. Thus, on the surface of the strips or films made of TiA16V4 according to the invention, no pure α-phase or only a thin, approximately 1 to 2 μm thick α-phase enriched zone (so-called "α-case") is visible. Another advantage of the method according to the invention is that it dispenses with a final annealing of the produced strip or the produced film of TiA16V4, so that an additional Absorption of oxygen into the material, as inevitably takes place in a final annealing, which leads to formation of an α-case and to a reduction or even a loss of ductility, is reliably prevented.

In principle, the method according to the invention is not limited with regard to the exact process parameters of hot rolling. Hot rolling in the sense of the present invention may comprise one or more hot rolling steps. Good results are obtained, in particular, when hot rolling in process step a) is carried out at a temperature of between 800 and 1050 ° C., and particularly preferably between 800 and 1000 ° C. If two or more hot rolling steps are performed, the last hot rolling step may be performed even at a temperature lower than the lower limit of the aforementioned temperature ranges.

Furthermore, it has proven to be advantageous to carry out the hot rolling with a degree of deformation between 20 and 90% and particularly preferably between 30 and 80%.

In principle, the method according to the invention can be carried out with a known TiA16V4 alloy, these being between 5.5 and 6.75% by weight of aluminum, between 3.5 and 4.5% by weight, as listed in DIN ISO 5832-3. % Vanadium, less than 0.3 wt% iron, less than 0.2 wt% oxygen, less than 0.08 wt% carbon, less than 0.05 wt% nitrogen, less than or equal to zero , 0 15 wt .-% hydrogen and the rest may have titanium.

• 5,5 bis 6,5 Gew.-% Aluminium,
• 3,5 bis 4,3 Gew.-% Vanadium,
• weniger als 0,02 Gew.-% Stickstoff,
• weniger als 0,05 Gew.-% Kohlenstoff,
• weniger als 0,15 Gew. -% Sauerstoff,
• weniger als 0,01 Gew.-% Wasserstoff,
• weniger als 0,2 Gew.-% Eisen und
• Rest unvermeidbare Verunreinigungen und Titan.

According to a preferred embodiment of the present invention, the TiA16V4 alloy of the sheet used has, after hot rolling, ie after the implementation of step a), the following composition:

• 5.5 to 6.5% by weight of aluminum,
• 3.5 to 4.3% by weight of vanadium,
• less than 0.02% by weight of nitrogen,
• less than 0.05% by weight of carbon,
• less than 0.15% by weight of oxygen,
• less than 0.01% by weight of hydrogen,
• less than 0.2% by weight of iron and
• Rest inevitable impurities and titanium.

In the context of the present invention, it has been found that with a hot-rolled sheet with the abovementioned composition, after the subsequent thermal pretreatment and the final cold rolling, an outstandingly superplastic-formable strip or film of TiA16V4 is obtained.

• 5,5 bis weniger als 6,0 Gew.-% Aluminium,
• 3,5 bis 4,2 Gew.-% Vanadium,
• weniger als 0,02 Gew.-% Stickstoff,
• weniger als 0,05 Gew.-% Kohlenstoff,
• weniger als 0,15 Gew.-% Sauerstoff,
• weniger als 0,01 Gew. -% Wasserstoff,
• weniger als 0,15 Gew.-% Eisen und
• Rest unvermeidbare Verunreinigungen und Titan.

In a further development of the inventive concept, it is proposed that the TiA16V4 alloy after hot rolling according to step a) has the following composition:

• 5.5% to less than 6.0% by weight aluminum,
• 3.5 to 4.2% by weight of vanadium,
• less than 0.02% by weight of nitrogen,
• less than 0.05% by weight of carbon,
• less than 0.15% by weight of oxygen,
• less than 0.01% by weight of hydrogen,
• less than 0.15% by weight of iron and
• Rest inevitable impurities and titanium.

The thermal pretreatment in step b) can be carried out at any temperature between 650 and 850 ° C, with particularly good results are achieved when the temperature in the thermal pre-treatment between 700 and 800 ° C.

The thermal pretreatment is preferably carried out in a high vacuum in order to completely or at least almost completely avoid oxygen uptake into the surface of TiA16V4, so that an accumulation of the α-phase at the surface is avoided. For example, the thermal pretreatment for 0.5 to 2 hours at a temperature between 700 and 800 ° C in a high vacuum, preferably for 1 hour at 760 ° C in a high vacuum, be performed, the sheet after the thermal pretreatment preferably slowly, for example, with a cooling time of between 10 and 24 hours, and preferably between 12 and 20 hours. For the purposes of the present invention, a high vacuum refers to a pressure which is at most 13.3 mPa or 10 ^-4 Torr.

In addition to the thermal pretreatment, mechanical pretreatment of the hot-rolled sheet can also be carried out between process steps a) and c), wherein the mechanical pretreatment can be carried out before, simultaneously or after the thermal pretreatment according to process step b).

For example, the mechanical pre-treatment step may include or consist of grinding the surface of the hot-rolled sheet.

As an alternative to, or in addition to, grinding the surface of the hot rolled sheet, the optional mechanical pretreatment may include dry cleaning, preferably degreasing with a degreaser.

Preferably, the hot-rolled sheet used in the step c) has a thickness of at least 1 mm.

• (Ausgangsdicke des Blechs vor dem Kaltwalzen - Enddicke des Bandes nach dem Kaltwalzen)/Ausgangsdicke des Blechs vor dem Kaltwalzen).

According to the invention, the cold rolling of the hot-rolled and thermally pretreated sheet is carried out to the strip or sheet having a thickness of not more than 0.9 mm with a degree of deformation of at least 30%, wherein the degree of deformation per single stitch is between 1 and 15%. The degree of deformation is calculated according to the present invention by the following equation:

• (Initial thickness of the sheet before cold rolling - final thickness of the strip after cold rolling) / initial thickness of the sheet before cold rolling).

The cold rolling is preferably carried out in process step c) with a degree of deformation of between 30% and 80% and particularly preferably with a degree of deformation of between 45 and 60%.

Furthermore, it is preferred that the cold rolling in the process step c) with a degree of deformation per single stitch between 2 and 10%, and preferably is carried out with a degree of deformation per single stitch between 3 and 7%.

According to the invention, method step c) may consist of a cold rolling step comprising a plurality of individual passes or may comprise two or more cold rolling steps each interrupted by an intermediate annealing step. While a cold rolling step is usually sufficient for strips to be produced having a final thickness of between 0.4 and 0.9 mm, for strips to be produced having a final thickness of less than 0.4 mm, it is necessary to carry out two or more, one by one Zwischenglühschritt interrupted cold rolling steps proved advantageous.

• c₁) Kaltwalzen des warmgewalzten und thermisch vorbehandelten Blechs aus dem Schritt b) mit einem Umformgrad von wenigstens 30 %, wobei der Umformgrad pro Einzelstich zwischen 1 und 15 % beträgt, zu einem Band oder einer Folie mit einer Dicke von nicht mehr als 0,9 mm,
• c₂) Zwischenglühen des in dem Schritt c₁) erhaltenen Bandes bzw. der Folie bei einer Temperatur zwischen 650 und 850 °C und
• c₃) Kaltwalzen des in dem Schritt c₂) erhaltenen Bandes bzw. Folie mit einem Umfonngrad zwischen 10 und 40 %, wobei der Umformgrad pro Einzelstich zwischen 0,1 und 10 % beträgt, auf das Endmaß.

According to the latter embodiment, the cold rolling in method step c) preferably comprises the following steps:

• c ₁ ) cold rolling the hot-rolled and thermally pretreated sheet from step b) with a degree of deformation of at least 30%, wherein the degree of deformation per single pass is between 1 and 15%, to a tape or a film having a thickness of not more than 0, 9 mm,
• c ₂ ) intermediate annealing of the strip or foil obtained in step c ₁ ) at a temperature between 650 and 850 ° C and
• c ₃ ) cold rolling of the strip or film obtained in step c ₂ ) with a degree of thickening between 10 and 40%, the degree of deformation per individual pass being between 0.1 and 10%, to the final dimension.

Also in this embodiment, the degree of deformation in the method step c ₁ ) is preferably between 30% and 80% and more preferably between 45 and 60%, wherein the degree of deformation per single stitch is preferably between 2 and 10% and more preferably between 3 and 7%.

The intermediate annealing in process step c ₂ ) can be carried out at any temperature between 650 and 850 ° C, with particularly good results are achieved when the temperature in the intermediate annealing between 700 and 800 ° C.

Preferably, the intermediate annealing is carried out in a high vacuum in order to completely or at least almost completely avoid oxygen uptake into the surface of TiA16V4, so that an accumulation of the α-phase at the surface is avoided. For example, the intermediate annealing for 0.5 to 2 hours at a temperature between 700 and 800 ° C in a high vacuum, preferably for 1 hour at 760 ° C in a high vacuum, be performed, the material after the intermediate annealing preferably slowly, for example with a cooling time of between 10 and 24 hours, and preferably between 12 and 20 hours.

In a further development of the inventive concept, it is proposed to carry out the cold rolling in process step c ₃ ) with a degree of deformation of between 15 and 30%, wherein the degree of deformation per single pass is preferably between 0.5 and 5%.

Regardless of whether one, two, or more than two cold rolling steps are performed, cold rolling preferably occurs with rolls a multi-roll mill, and particularly preferably carried out with a four-high mill.

In principle, the method according to the invention can be used to produce superplastic-formable tapes or superplastic-formable films of TiA16V4 with an arbitrary thickness of not more than 0.9 mm. In particular, the inventive method is suitable for the production of superplastic forming tapes or superplastic formable films of TiA16V4 with an (end) thickness of less than 0.7 mm, preferably less than 0.5 mm, more preferably less than 0.4 mm , most preferably between 0.1 and 0.3 mm and most preferably about 0.2 mm.

Another object of the present invention is a superplastic formable film of TiA16V4 having a thickness of not more than 0.9 mm, which or which is obtainable by the inventive method described above.

The tape or film according to the invention is characterized by an excellent superplastic formability. In addition, the tape or film according to the invention has a homogeneous structure, a uniform thickness and a non-porous and smooth surface. Furthermore, the tapes or films of TiA16V4 according to the invention on their surface are not so much enriched with the α-phase as the known from the prior art TiA16V4 materials. Thus, no α-case or only a 1 to 2 μm thick α-case is visible on the surface of the tapes or films of TiA16V4 according to the invention by light microscopy.

• 5,5 bis 6,5 Gew. -% Aluminium,
• 3,5 bis 4,3 Gew.-% Vanadium,
• weniger als 0,02 Gew.-% Stickstoff,
• weniger als 0,05 Gew. -% Kohlenstoff,
• weniger als 0,15 Gew.-% Sauerstoff,
• weniger als 0,01 Gew.-% Wasserstoff,
• weniger als 0,2 Gew. -% Eisen und
• Rest unvermeidbare Verunreinigungen und Titan.

According to a preferred embodiment of the present invention, the tape or film according to the invention has the following composition:

• 5.5 to 6.5% by weight of aluminum,
• 3.5 to 4.3% by weight of vanadium,
• less than 0.02% by weight of nitrogen,
• less than 0.05% by weight of carbon,
• less than 0.15% by weight of oxygen,
• less than 0.01% by weight of hydrogen,
• less than 0.2% by weight of iron and
• Rest inevitable impurities and titanium.

• 5,5 bis weniger als 6,0 Gew.-% Aluminium,
• 3,5 bis 4,2 Gew.-% Vanadium,
• weniger als 0,02 Gew.-% Stickstoff,
• weniger als 0,05 Gew.-% Kohlenstoff,
• weniger als 0,15 Gew.-% Sauerstoff,
• weniger als 0,01 Gew.-% Wasserstoff,
• weniger als 0,15 Gew.-% Eisen und
• Rest unvermeidbare Verunreinigungen und Titan.

The tape or the film according to the invention particularly preferably has the following composition:

• 5.5% to less than 6.0% by weight aluminum,
• 3.5 to 4.2% by weight of vanadium,
• less than 0.02% by weight of nitrogen,
• less than 0.05% by weight of carbon,
• less than 0.15% by weight of oxygen,
• less than 0.01% by weight of hydrogen,
• less than 0.15% by weight of iron and
• Rest inevitable impurities and titanium.

In a further development of the concept of the invention, it is proposed that the thickness of the band or of the film is less than 0.7 mm, preferably less than 0.5 mm, particularly preferably less than 0.4 mm, very particularly preferably between 0.1 and 0.3 mm and most preferably about 0.2 mm.

In the following, the present invention is explained in more detail by means of two exemplary, non-limiting examples.

example 1

The starting material used was a hot rolled TiA16V4 sheet having a thickness of 1 mm, which (after hot rolling) had the following composition:
Al: 5.6%; V: 4.2%; N: <0.02%; C: <0.05%; O: <0.15%; H: <0.01%; Fe: 0.1%.

The sheet was cut into strips having a width of 120 mm. These strips were lightly ground and cleaned on the surface. Thereafter, the strips were subjected to high vacuum annealing for 1 hour at 760 ° C. Cooling to room temperature was carried out under high vacuum with an 18-hour cooling time. These strips were cold rolled in a single pass on a quarto mill from approx. 10% to approx. 2% to an intermediate dimension of 0.4 mm. In this intermediate measure, a trimming to 100 mm was performed on a circular knife shears. Subsequently, the pre-rolled material was cold rolled in single stitches from about 5% beginning to about 1.5% to an intermediate dimension of 0.25 mm. The rolled strip was degreased and trimmed to 90 mm on a circular knife shear. This was followed by an intermediate annealing for 1 hour at 760 ° C in a high vacuum. Cooling to room temperature was carried out under high vacuum with an 18-hour cooling time. The interannealed tape was then started with single stitches of about 3% up to approx. 0.5% finished with corresponding smoothing passes to the final dimension of 0.2 mm rolled finished.

In order to avoid tape breaks, a further intermediate seaming during intermediate rolling of 1 to 0.4 mm can be made if necessary.

The strip produced in this way was degreased and, in this rolling state, could be superplasticized in a relatively wide forming window.

Example 2

The starting material used was a hot rolled TiA16V4 sheet having a thickness of 1 mm, which (after hot rolling) had the following composition: $$\mathrm{al}:5.6\%;\mathrm{V}:4.2\%;\mathrm{N}:<0.02\%;\mathrm{C}:<0.05.\%;\mathrm{O}:<0.15\%;\mathrm{H}:<0.01\%;\mathrm{Fe}:0.1\%\mathrm{,}$$

The sheet was cut into strips having a width of 120 mm. These strips were lightly ground and cleaned on the surface. Thereafter, the strips were subjected to high vacuum annealing for 1 hour at 760 ° C, followed by 12 hours cooling to room temperature under high vacuum. On a four-high rolling mill, these strips were rolled in single passes from approx. 10% starting to approx. 2.5% ending with corresponding smoothing passes to the final dimension of 0.5 mm. The tape was degreased. In this rolling condition, the strip material could be superplastically formed in an adapted forming window.

Claims (17)

Method of making a superplastic forming tape or a superplastic formable film of TiA16V4 having a thickness of not more than 0.9 mm, comprising the steps of: a) hot rolling a sheet of TiA16V4, b) thermal pre-treatment of the hot-rolled sheet at a temperature between 650 and 850 ° C and c) cold rolling the hot-rolled and thermally pretreated sheet having a degree of deformation of at least 30%, wherein the degree of deformation per single stitch is between 1 and 15%, to a tape or a sheet having a thickness of not more than 0.9 mm, wherein the cold-rolled strip or the cold-rolled foil is not finally annealed. Method according to claim 1,
characterized in that
the hot rolling in step a) at a temperature between 800 and 1050 ° C, preferably between 800 and 1000 ° C, is performed. Method according to claim 1 or 2,
characterized in that
the hot rolling is carried out with a degree of deformation between 20 and 90%, preferably between 30 and 80%. Method according to at least one of the preceding claims,
characterized in that
the TiA16V4 alloy after hot rolling according to step a) has the following composition: From 5.5 to 6.5% by weight of aluminum, 3.5 to 4.3% by weight of vanadium, less than 0.02% by weight of nitrogen, less than 0.05% by weight of carbon, less than 0.15% by weight of oxygen, less than 0.01% by weight of hydrogen, less than 0.2% by weight of iron and - Rest unavoidable impurities and titanium. Method according to claim 4,
characterized in that
the TiA16V4 alloy after hot rolling according to step a) has the following composition: From 5.5% to less than 6.0% by weight of aluminum, From 3.5 to 4.2% by weight of vanadium, less than 0.02% by weight of nitrogen, less than 0.05% by weight of carbon, less than 0.15% by weight of oxygen, less than 0.01% by weight of hydrogen, less than 0.15% by weight of iron and - Rest unavoidable impurities and titanium. Method according to at least one of the preceding claims,
characterized in that
the thermal pretreatment in step b) is carried out at a temperature between 700 and 800 ° C and preferably under high vacuum of not more than 13.3 mPa. Method according to at least one of the preceding claims,
characterized in that
before, simultaneously or after the thermal pretreatment according to step b) and before the cold rolling according to step c), a mechanical pretreatment of the hot-rolled sheet is carried out. Method according to claim 7,
characterized in that
the mechanical pretreatment comprises grinding the surface of the hot-rolled sheet. Method according to claim 7 or 8,
characterized in that
the mechanical pretreatment comprises a chemical cleaning, preferably a degreasing with a degreasing agent. Method according to at least one of the preceding claims,
characterized in that
the hot-rolled sheet used in the step c) has a thickness of at least 1 mm. Method according to at least one of the preceding claims,
characterized in that
the cold rolling in step c) is carried out with a degree of deformation between 30% and 80% and preferably with a degree of deformation between 45 and 60%. Method according to at least one of the preceding claims,
characterized in that
the cold rolling in step c) is carried out with a degree of deformation per single pass between 2 and 10% and preferably with a degree of deformation per single pass between 3 and 7%. Method according to at least one of the preceding claims,
characterized in that
the cold rolling in step c) comprises the following steps: c ₁ ) cold rolling the hot-rolled and thermally pretreated sheet from step b) with a degree of deformation of at least 30%, wherein the degree of deformation per single pass is between 1 and 15%, to a tape or a film having a thickness of not more than 0, 9 mm, c ₂ ) intermediate annealing of the strip or foil obtained in step c ₁ ) at a temperature between 650 and 850 ° C and c ₃ ) cold rolling of the strip or film obtained in step c ₂ ) with a degree of deformation of between 10 and 40%, wherein the degree of deformation per single pass is between 0.1 and 10%, to the final dimension. Method according to at least one of the preceding claims,
characterized in that
the final thickness of the strip or foil after the cold rolling step c) or after the cold rolling step c ₃ ) is less than 0.7 mm, preferably less than 0.5 mm, more preferably less than 0.4 mm and most preferably between 0.1 and 0.3 mm. Superplastic forming tape or superplastic forming film of TiA16V4 having a thickness of not more than 0.9 mm obtainable by a process according to any one of claims 1 to 14. Superplastic forming tape or superplastic forming film according to claim 15,
characterized in that
the tape or film has the following composition: From 5.5 to 6.5% by weight of aluminum, 3.5 to 4.3% by weight of vanadium, less than 0.02% by weight of nitrogen, less than 0.05% by weight of carbon, less than 0.15% by weight of oxygen, less than 0.01% by weight of hydrogen, less than 0.2% by weight of iron and - Rest unavoidable impurities and titanium. Superplastic forming tape or superplastic forming film according to claim 15 or 16,
characterized in that
this or this has a thickness of less than 0.7 mm, preferably less than or equal to 0.5 mm, more preferably less than 0.4 mm and most preferably between 0.1 and 0.3 mm.