The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 2008
Filed:
Mar. 18, 2004
Katsunari Oikawa, Shibata-gun, JP;
Kiyohito Ishida, Sendai-shi, Miyagi-ken, JP;
Ryosuke Kainuma, Natori, JP;
Yuuki Tanaka, Sendai, JP;
Masahiro Ohta, Wako, JP;
Toru Sukigara, Wako, JP;
Katsunari Oikawa, Shibata-gun, JP;
Kiyohito Ishida, Sendai-shi, Miyagi-ken, JP;
Ryosuke Kainuma, Natori, JP;
Yuuki Tanaka, Sendai, JP;
Masahiro Ohta, Wako, JP;
Toru Sukigara, Wako, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Other;
National Institute of Advanced Industrial Science & Technology, Tokyo, JP;
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.