Ni—Ti-based alloy material, method for producing Ni—Ti-based alloy material, and wire or tube including Ni—Ti-based alloy material
AssigneesFurukawa Techno Material Co., Ltd., Furukawa Electric Co., Ltd.
InventorsFumiyoshi Yamashita, Sumio Kise, Kenji Uruma
Life of this patent
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Abstract
A Ni—Ti-based alloy material includes a matrix phase consisting essentially of a Ni—Ti-based alloy and having a B2 type crystal structure. A nonmetallic inclusion is present in the matrix phase, in which 99% by mass or more of the nonmetallic inclusion is a TiC-based inclusion having a NaCl type crystal structure, the TiC-based inclusion has a lattice misfit (δ) in a range of 0.4238 or more and 0.4259 or less. The lattice misfit (δ) is represented by Expression δ=(a1−a2)/a2, where a1 is a lattice constant (Å) of the TiC-based inclusion and a2 is a lattice constant (Å) of the matrix phase.
Claims14
A Ni—Ti-based alloy material comprising:
- a matrix phase consisting essentially of a Ni—Ti-based alloy and having a B2 crystal structure;
- and
- a nonmetallic inclusion present in the matrix phase, wherein
- 99% by mass or more of a totality of nonmetallic inclusions is a TIC inclusion having a NaCl crystal structure,
- the TiC inclusion has a lattice misfit (δ) in a range of 0.4238 or more and 0.4259 or less, the lattice misfit (δ) being represented by Expression (1) below,
- δ
- =
- (
- a
-
-
- 1
- -
- a
-
-
- 2
- )
- /
- a
-
-
- 2
- Expression
-
-
- (
- 1
- )
- a1 is a lattice constant (Å) of the TiC inclusion and a2 is a lattice constant (Å) of the matrix phase,
- the Ni—Ti-based alloy is free of Ti4Ni2Ox, and
- the Ni—Ti-based alloy material has a ratio ([C]/[O] ratio) of a carbon concentration ([C]) to an oxygen concentration ([O]) in a range of 0.8 or more and less than 1.4.
Dependencies are inferred from the claim text.