Acoustic emission at the premartensitic and martensitic transitions of Ni2MnGa shape memory alloy

被引：0
|
作者：
Mañosa, L. [1 ]
Carrillo, L. [1 ]
Vives, E. [1 ]
Obradó, E. [1 ]
Gonzàlez-Comas, A. [1 ]
Planes, A. [1 ]
机构：
[1] Dept. d'Estructura i Constituents M., Facultat de Física, Universitat de Barcelona, Diagonal 647, ES-08028 Barcelona, Catalonia, Spain
来源：
Materials Science Forum | 2000年 / 327卷
关键词：
Acoustic emissions - Calorimetry - Martensitic transformations - Shape memory effect - Stoichiometry;
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摘要：
An Acoustic Emission (AE) study of the martensitic and premartensitic transitions in nearly stoichiometric Ni-Mn-Ga alloy is reported. By comparing the AE with calorimetric results, it is shown that AE is generated at both transitions. The AE intensity at the premartensitic transition is extremely weak, in accordance with its weakly first-order character. The amplitude distribution of the AE signals recorded during the martensitic transformation is a power law, with an exponent α = 2.2±0.1. This value is compared with recent results obtained in other shape-memory alloys.
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页码：481 / 484
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