A new quantitative approach to the thermoelastic martensitic transformation: The density of elastic states

被引：31

作者：

Rodriguez-Aseguinolaza, J. ^{[2
]}

Ruiz-Larrea, I. ^{[1
]}

No, M. L. ^{[1
]}

Lopez-Echarri, A. ^{[2
]}

San Juan, J. ^{[2
]}

机构：

[1] Univ Basque Country, Fac Ciencia & Tecnol, Dept Fis Aplicada 2, E-48080 Bilbao, Spain

[2] Univ Basque Country, Fac Ciencia & Tecnol, Dept Fis Mat Condensada, E-48080 Bilbao, Spain

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 20期

关键词：

Shape memory alloys; Adiabatic calorimetry; Martensitic transformation; Cu-Al-Ni; Optical microscopy;

D O I：

10.1016/j.actamat.2008.08.059

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A thermodynamic study, based on high-sensitivity adiabatic calorimetry, of the martensitic transformation undergone by Cu-Al-Ni shape memory alloys is presented. From the specific heat data, the thermodynamic function values, and in particular the crystal free energy, as functions of temperature have been obtained. These results have permitted a careful estimation of the phase transformation temperatures of each beta(3)' martensite plate as function of its stored elastic energy. Within this frame, the distribution density of the elastic energy states in the martensitic phase is directly derived from the specific heat data. It also permits a simple analysis of the nucleation processes and gives a convincing explanation of the temperature memory effects. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：6283 / 6290

页数：8

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