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Thermal arrest analysis of thermoelastic martensitic transformations in shape memory alloys

Published online by Cambridge University Press:  19 May 2011

Qinglin Meng
Affiliation:
School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Western Australia 6009, Australia
Hong Yang
Affiliation:
School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Western Australia 6009, Australia
Yinong Liu*
Affiliation:
School of Mechanical and Chemical Engineering, The University of Western Australia, Crawley, Western Australia 6009, Australia; and Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China
Tae-hyun Nam
Affiliation:
School of Materials Science and Engineering, Gyeongsang National University, Jinju, Gyeongnam 660-701, Korea
F. Chen
Affiliation:
Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

This study investigated a fundamental aspect of thermoelastic martensitic transformations in different shape memory alloys by means of interrupted thermal analysis technique using differential scanning calorimetry (DSC). The objective of this study was to determine the true transformation temperature interval. It also provides the opportunity to further the discussion of time dependence of the transformations. The study applied a technique of thermal arrest amidst phase transformations. The transformation temperature intervals were found to be 8.4 and 12.9 K for the forward and reverse B2↔B19′ martensitic transformation in a near-equiatomic Ti-50.2 at.% Ni alloy and 14.7 and 12.8 K in a Ni-rich Ti-50.8 at.% Ni alloy and 7.3 and 9.1 K for the L21↔orthorhombic transformation in a Ni43Co7Mn39In11 alloy. These values were significantly smaller than those commonly reported in the literature. The experimental evidences also demonstrated that the apparent time dependences of the martensitic transformations manifested in DSC analysis were artifacts caused by instrumental thermal inertia.

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Articles
Copyright
Copyright © Materials Research Society 2011

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