Magnetic and martensitic phase transitions in ferromagnetic Ni-Ga-Fe shape memory alloys
Magnetic and martensitic phase transitions in ferromagnetic Ni-Ga-Fe shape memory alloys
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DOI：
10.1063/1.1532105
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发表时间：
2002-12-30
影响因子：
4
通讯作者：
Ishida, K
中科院分区：
文献类型：
--
作者：
Oikawa, K;Ota, T;Ishida, K
研制了Ni-Ga-Fe系具有体心立方有序结构的铁磁形状记忆合金。合金成分范围为Ni 27 at. % Ga（20-22 at. %）Fe表现出从B2和/或L2（1）母体到马氏体相的热弹性马氏体转变，在铁磁状态下具有七层调制（14 M）和五层调制（10 M）结构。在冷却过程中，母相在970 K左右由B2转变为L2（1）结构，773 K退火使母相中L2（1）有序度增加，导致马氏体起始温度和居里温度升高。的.这些合金的延展性通过引入少量的γ相固溶体而得到改善。因此，我们可以得出结论，本合金是铁磁形状记忆合金的前景。(C)2002年美国物理学会。[DOI：10.1063/1.1532105]。
Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni-Ga-Fe system have been developed. The alloys with the composition range of Ni 27 at. % Ga (20-22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L2(1) parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the ferromagnetic state. The parent phase transforms from the B2 to the L2(1) structure at about 970 K during cooling, and the degree of the L2(1) order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The. ductility of these alloys is improved by introducing of a small amount of gamma-phase solid solution. Consequently, We can conclude that the present alloys are promising for ferromagnetic shape memory alloys. (C) 2002 American Institute of Physics. [DOI: 10.1063/1.1532105].