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

Foreign code F110003514
File No. A282-11WO
Posted date Jun 28, 2011
Country United States of America
Application number 09202206
Gazette No. 20090242083
Gazette No. 8083990
Date of filing Nov 2, 2006
Gazette Date Oct 1, 2009
Gazette Date Dec 27, 2011
International application number JP2006321996
International publication number WO2007055155
Date of international filing Nov 2, 2006
Date of international publication May 18, 2007
Priority data
  • P2005-325393 (Nov 9, 2005) JP
  • 2006WO-JP321996 (Nov 2, 2006) WO
Title Iron-based alloy having shape memory properties and superelasticity and its production method
Abstract (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.
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • ISHIDA KIYOHITO
  • KAINUMA RYOSUKE
  • SUTOU YUJI
  • TANAKA YUUKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) CREST The Innovation of Simulation Technology and the Construction of Foundations for Its Practical Use AREA
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