Shape memory alloy and method for producing same
US7371295B2 · kind B2 · utility
1Cited by
1References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Mar 18, 2004 |
| Grant date | May 13, 2008 |
| Priority date | — |
| Expiry date | Dec 8, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A shape memory alloy comprises Co, Ni and Al with a two-phase structure comprising a β-phase having a B2 structure and a γ-phase having an fcc structure, at least 40% by area of crystal grain boundaries of the β-phase being occupied by the γ-phase. The shape memory alloy can be produced by a first heat treatment step comprising heating at 1200 to 1350° C. for 0.1 to 50 hours and cooling at 0.1 to 1000° C./minute, and a second heat treatment step comprising heating at 1000 to 1320° C. for 0.1 to 50 hours and cooling at 10 to 10000° C./minute.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.