Titanium alloy of low young's modulus

Abstract

A titanium alloy contains vanadium, from 10 to 20% by weight; aluminum, from 0.2 to 10% by weight; and a balance essentially titanium, and the alloy has a microstructure including a martensite phase. Alternatively, the titanium alloy contains vanadium, from 10 to 20% by weight; aluminum, from 0.2 to 10% by weight; and a balance essentially titanium, and the alloy has a microstructure including a β phase capable of transforming into a martensite phase by cold working or cooling under a room temperature.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[FIG. 1] is a process chart showing a treatment treated for working examples and comparative examples.

[FIG. 2] is an optical microscopic photograph of a titanium alloy of a working example 1.

[FIG. 3] is an optical microscopic photograph of a titanium alloy of a working example 2.

[FIG. 4] is an optical microscopic photograph of a titanium alloy of a working example 7.

[FIG. 5] is an optical microscopic photograph of a titanium alloy of a working example 9.

[FIG. 6] is an optical microscopic photograph of a titanium alloy of a working example 11.

[FIG. 7] is an optical microscopic photograph of a titanium alloy of a working example 13.

[FIG. 8] is a graph showing X-ray diffraction results of the working example 2 and the working example 11.

[FIG. 9] is a graph showing X-ray diffraction results of the working example 13 and the working example 14.

Claims

1. A titanium alloy, comprising: vanadium, from 10 to 20% by weight;aluminum, from 0.2 to 10% by weight; anda balance essentially titanium,the alloy having a microstructure including a martensite phase.

2. The titanium alloy of claim 1, further comprising: one or more elements selected from the group of stannum, silicon and indium, the elements being from 0.01 to 10% by weight.

3. The titanium alloy of claim 1, wherein the titanium alloy is treated with a solution treatment at a β transus temperature or higher and cold working after the solution treatment.

4. The titanium alloy of claim 1, wherein the alloy is worked to plastically deform in a specific direction, the martensite phase includes an α′ phase and an α″ phase, and diffraction intensities of the alloy by a X-ray diffraction method satisfies any one or more inequalities selected from the group of, (Iα″(002)⊥/Iα″(111)⊥)/(Iα″(002)∥/Iα″(111)∥)≦1, and(Iα′(002)⊥/Iα′(101)⊥)/(Iα′(002)∥/Iα′(101)∥)≦1,where Iα″(002)⊥ represents a diffraction intensity from a (002) face of the α″ phase in a section perpendicular to the specific direction,Iα″(111)⊥ represents a diffraction intensity from a (111) face of the α″ phase in a section perpendicular to the specific direction,Iα″(002)∥ represents a diffraction intensity from a (002) face of the α″ phase in a section parallel to the specific direction,Iα″(111)∥ represents a diffraction intensity from a (111) face of the α″ phase in a section parallel to the specific direction,Iα′(002)⊥ represents a diffraction intensity from a (002) face of the α′ phase in a section perpendicular to the specific direction,Iα′(101)⊥ represents a diffraction intensity from a (101) face of the α′ phase in a section perpendicular to the specific direction,Iα′(002)∥ represents a diffraction intensity from a (002) face of the α′ phase in a section parallel to the specific direction, andIα′(101)∥ represents a diffraction intensity from a (101) face of the α′ phase in a section parallel to the specific direction.

5. A titanium alloy having a microstructure, comprising: vanadium, from 14 to 20% by weight;aluminum, from 0.2 to 10% by weight; anda balance essentially titanium,the alloy having a microstructure including a β phase capable of transforming into a martensite phase by cold working or cooling under a room temperature.

6. The titanium alloy of claim 5, further comprising: one or more elements selected from the group of stannum, silicon and indium, the elements being from 0.01 to 10% by weight.

7. The titanium alloy of claim 5, wherein the titanium alloy is treated with a solution treatment at a β transus temperature or higher and cold working after the solution treatment.

8. The titanium alloy of claim 5, wherein the alloy is worked to plastically deform in a specific direction, the martensite phase includes an α′ phase and an α″ phase, and diffraction intensities of the alloy by a X-ray diffraction method satisfies any one or more inequalities selected from the group of, (Iα″(002)⊥/Iα″(111)⊥)/(Iα″(002)∥/Iα″(111)∥)≦1, and(Iα′(002)⊥/Iα′(101)⊥)/(Iα′(002)∥/Iα′(101)∥)≦1,where Iα″(002)⊥ represents a diffraction intensity from a (002) face of the α″ phase in a section perpendicular to the specific direction,Iα″(111)⊥ represents a diffraction intensity from a (111) face of the α″ phase in a section perpendicular to the specific direction,Iα″(002)∥ represents a diffraction intensity from a (002) face of the α″ phase in a section parallel to the specific direction,Iα″(111)∥ represents a diffraction intensity from a (111) face of the α″ phase in a section parallel to the specific direction,Iα′(002)⊥ represents a diffraction intensity from a (002) face of the α′ phase in a section perpendicular to the specific direction,Iα′(101)⊥ represents a diffraction intensity from a (101) face of the α′ phase in a section perpendicular to the specific direction,Iα′(002)∥ represents a diffraction intensity from a (002) face of the α′ phase in a section parallel to the specific direction, andIα′(101)∥ represents a diffraction intensity from a (101) face of the α′ phase in a section parallel to the specific direction.