抄録
Shape memory alloys had been put to first practical use in toy as shape recoverable wire and are now highly-popularized in wide range of areas such as cars and electrical goods. Many applications necessitate an extension of usual definition of fatigue. Meanwhile, cycling effects are depend on surface condition of elements. In the case of Shape memory alloys, surface finishing are texture control, mechanical and chemical polishing. In specially, medical devices retained in the body should have good properties to the kink-resistance.
