Powder metallurgical process for producing a copper-based shape-memory alloy
US4410488A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1981 |
| Grant date | Oct 18, 1983 |
| Priority date | — |
| Expiry date | Jul 27, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/006
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Shape-memory alloys comprised of Cu/Al or Cu/Al/Ni are produced by a powder metallurgical process wherein a coarse-grained powder of pre-alloyed and/or pre-mixed powder alloys having a grain size of 0.05 to 0.8 mm is introduced into a metal container which is then evacuated, sealed, and hot isostatically pressed. The resulting billet is then hot worked. In another embodiment, the powder is first placed in a rubber tube and cold isostatically pressed. The billet is then placed in a cylinder having deformable walls, such as a copper cylinder, the cylinder is sealed, and the powder therein is then hot isostatically pressed, and the billet so prepared is subjected to a homogenization heat treatment and hot working.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.