Martensitic transformation in constrained films

被引：81

作者：

Roytburd, AL ^{[1
]}

Kim, TS ^{[1
]}

Su, QM ^{[1
]}

Slutsker, J ^{[1
]}

Wuttig, M ^{[1
]}

机构：

[1] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

来源：

ACTA MATERIALIA | 1998年 / 46卷 / 14期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S1359-6454(98)00165-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A thermodynamic analysis is presented for the martensitic transformation in a constrained film upon cooling and heating. It is shown that this transformation proceeds with a variable self-strain corresponding to a variable polydomain structure of the martensite phase. Even the equilibrium microstructure develops irreversibly with changing temperature, i.e. the microstructure evolution paths for the direct and the reverse transformations are different. During the reverse transformation the stressed austenite, incompatible to martensite. is formed. The theory predicts a considerable shift of the temperature interval of transformation and its broadening due to the constraint. Experimental studies of the stress evolution with changing temperature in NiTi polycrystalline films on Si substrates support the principal thermodynamic conclusions. (C) 1998 Acta Metallurgica Inc. Published bf Elsevier Science Ltd. All rights reserved.

引用

页码：5095 / 5107

页数：13

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