Phase diagrams in the Ni-Mn-Ga system under compression

被引：70

作者：

Chernenko, VA ^{[1
]}

Kokorin, VV ^{[1
]}

Babii, OM ^{[1
]}

Zasimchuk, IK ^{[1
]}

机构：

[1] Inst Magnetism, UA-252680 Kiev, Ukraine

来源：

INTERMETALLICS | 1998年 / 6卷 / 01期

关键词：

intermetallics; miscellaneous; shape-memory effects; phase diagram; thermodynamic and thermochemical properties;

D O I：

10.1016/S0966-9795(97)00050-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Some thermodynamic aspects of transformation behavior of two shape-memory and superelastic L2(1) ordered single-crystalline Ni-Mn-Ga alloys exhibiting martensitic transformation in the stress-free state at M-s = 287 K < T-c (alloy 1) and M-s = 428 K > T-c (alloy 2), where T-c is Curie temperature, was studied in compression (hydrostatic and/or uniaxial along [110] axis) tests. The uniaxial compression experimental results for alloy 1 which exhibits multiphase stress-induced transformation behavior as well as literature data were summarized in non-equilibrium sigma-T phase diagrams. The phenomenological treatment of the equilibrium high hydrostatic pressure versus transformation temperature data for alloys 1 and 2, i.e. p-T diagrams, was found to be useful in the framework of both the Clausius-Clapeyron relationship and Landau-type theory. Published by Elsevier Science Limited. All rights reserved.

引用

页码：29 / 34

页数：6

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