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Anomaly of critical stress in stress-induced transformation of NiCoMnIn metamagnetic shape memory alloy

Appl. Phys. Lett. 95, 181905 (2009); doi:10.1063/1.3254250

Published 2 November 2009

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Xiao Xu,1 Wataru Ito,1 Rie Y. Umetsu,1 Ryosuke Kainuma,1 and Kiyohito Ishida2
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
2Department of Materials Science, Graduate School of Engineering, Tohoku University, Aoba-yama 6-6-02, Sendai 980-8579, Japan
Stress-induced martensitic transformation below room temperature for a Ni45Co5Mn36.1In13.9 single-crystal, in which no martensitic transformation occurs during cooling down to 4.2 K under zero stress, was investigated by using compression test. The equilibrium stress estimated from the critical stresses in stress-induced forward and reverse transformations decreased with decreasing temperature, while it became almost constant at temperatures below about 140 K. This anomaly can be explained by the abnormal temperature dependence of the transformation entropy change, which has also been detected by magnetization measurement. ©2009 American Institute of Physics
History: Received 10 September 2009; accepted 6 October 2009; published 2 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/181905/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.40.Lm
    Deformation, plasticity, and creep
  • 62.20.fg
    Shape-memory effect; yield stress; superelasticity
  • 64.70.kd
    Solid-solid transitions in metals and alloys
  • 75.60.Ej
    Magnetization curves, hysteresis, Barkhausen and related effects
  • 75.30.Kz
    Magnetic phase boundaries
  • 81.70.-q
    Methods of materials testing and analysis
  • 81.40.Jj
    Elasticity and anelasticity, stress-strain relations
  • 65.40.gd
    Entropy of crystalline solids
  • 81.30.Kf
    Martensitic transformations
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (15)
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