Internal friction associated with the structural phase transformations in Ni-Mn-Ga alloys

被引:75
作者
Cesari, E [1 ]
Chernenko, VA [1 ]
Kokorin, VV [1 ]
Pons, J [1 ]
Segui, C [1 ]
机构
[1] INST MAGNETISM,UA-252680 KIEV,UKRAINE
关键词
D O I
10.1016/S1359-6454(96)00244-3
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A double peak in the temperature dependence of internal friction (IF) and elastic modulus in some off-stoichiometric Ni2MnGa shape memory alloys has been observed both on cooling and heating between the parent and martensite phases. Transmission electron microscopy (TEM) observations have shown that these anomalies are related to structural transformations from the parent cubic phase (P) to an intermediate cubic modulated phase (I) and from the I phase to the martensitic one (M). As for the IF results, the I to M transformation has the characteristics of a first-order phase transition, whereas the P to I transformation shows some distinctive Features, such as no temperature-rate dependence. Copyright (C) 1997 Acta Metallurgica Inc he.
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页码:999 / 1004
页数:6
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