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Iron-based alloy having shape memory properties and superelasticity and its production method

外国特許コード F110003514
整理番号 A282-11WO
掲載日 2011年6月28日
出願国 アメリカ合衆国
出願番号 09202206
公報番号 20090242083
公報番号 8083990
出願日 平成18年11月2日(2006.11.2)
公報発行日 平成21年10月1日(2009.10.1)
公報発行日 平成23年12月27日(2011.12.27)
国際出願番号 JP2006321996
国際公開番号 WO2007055155
国際出願日 平成18年11月2日(2006.11.2)
国際公開日 平成19年5月18日(2007.5.18)
優先権データ
  • 特願2005-325393 (2005.11.9) JP
  • 2006WO-JP321996 (2006.11.2) WO
発明の名称 (英語) Iron-based alloy having shape memory properties and superelasticity and its production method
発明の概要(英語) (US8083990)
An iron-based alloy having shape memory properties and superelasticity, which has a composition comprising 25-35% by mass of Ni, 13-25% by mass of Co, 2-8% by mass of Al, and 1-20% by mass in total of at least one selected from the group consisting of 1-5% by mass of Ti, 2-10% by mass of Nb and 3-20% by mass of Ta, the balance being substantially Fe and inevitable impurities, and a recrystallization texture substantially comprising a γ phase and a γ′ phase, particular crystal orientations of the γ phase being aligned, and the difference between a reverse transformation-finishing temperature and a martensitic transformation-starting temperature being 100° C. or less in the thermal hysteresis of martensitic transformation and reverse transformation.
特許請求の範囲(英語) [claim1]
1. An iron-based alloy having shape memory properties and superelasticity, which has a composition consisting of 25-35% by mass of Ni, 13-25% by mass of Co, 2-8% by mass of Al, and 1-20% by mass in total of at least one selected from the group consisting of 2-10% by mass of Nb and 3-20% by mass of Ta, optionally 0.001-1% by mass in total of at least one selected from the group consisting of B, C, Ca, Mg, P, S, Zr, Ru, La, Hf, Pb and a misch metal or 0.001-10% by mass in total of at least one selected from the group consisting of Be, Si, Ge, Mn, Cr, V, Mo, W, Cu, Ag, Au, Ga, Pd, Re and Pt, the balance being substantially Fe and inevitable impurities, and a recrystallization texture substantially composed of a gamma phase and a gamma ' phase, a frequency of a <100> direction of said gamma phase in a cold-working direction being 2 or more, and the difference between a reverse transformation-finishing temperature and a martensitic transformation-starting temperature being 100 deg. C. or less in the thermal hysteresis of martensitic transformation and reverse transformation.
[claim2]
2. The iron-based alloy according to claim 1, wherein 20% or more of the grain boundaries of said gamma phase are low-angle grain boundaries having orientation differences of 15 deg. or less.
[claim3]
3. The iron-based alloy according to claim 1, wherein the Ni content is 26-30% by mass.
[claim4]
4. The iron-based alloy according to claim 1, wherein the Al content is 4-6% by mass.
  • 発明者/出願人(英語)
  • ISHIDA KIYOHITO
  • KAINUMA RYOSUKE
  • SUTOU YUJI
  • TANAKA YUUKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
参考情報 (研究プロジェクト等) CREST The Innovation of Simulation Technology and the Construction of Foundations for Its Practical Use AREA
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