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Shape memory effect of an antiferromagnetic Mn–9.5 at.% Fe–5.0 at.% Cu alloy

✍ Scribed by J.H. Zhang; W.Y. Peng; J.J. Zhang; Zuyao (T.Y. Hsu) Xu

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
422 KB
Volume
481-482
Category
Article
ISSN
0921-5093

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✦ Synopsis

This paper mainly presents the shape memory effect in a Mn-rich antiferromagnetic Mn-9.5 at.% Fe-5.0 at.% Cu alloy. The fcc-fct martensitic transformation takes place following an antiferromagnetic transition, and (0 1 1) twin boundaries of fct martensite are formed. When the M s temperature of the fct martensitic transformation and the Néel point of the antiferromagnetic transition approach each other, a coupling between the second-order antiferromagnetic transition and the first-order martensitic transformation occurs. In this case the thermo-hysteresis of the transformation decreases, or even disappears. The temperature-dependent shape memory effect in the alloy was measured with a dilatometer using pre-compression loading followed by heating (from room temperature to 523 K) and cooling and monitoring the associated shape change. The characteristics of the hysteresis-free or very little thermo-hysteresis property are also discussed in relation to thermodynamic properties.

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