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首页> 外文期刊>Materials transactions >Phase Equilibria and Phase Transformations in New B2-type Ferromagnetic Shape Memory Alloys of Co-Ni-Ga and Co-Ni-Al Systems
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Phase Equilibria and Phase Transformations in New B2-type Ferromagnetic Shape Memory Alloys of Co-Ni-Ga and Co-Ni-Al Systems

机译：Co-Ni-Ga和Co-Ni-Al系统的新型B2型铁磁形状记忆合金的相平衡和相变

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摘要

The phase equilibria, the martensitic and magnetic phase transformations in the beta (B2) phase region of the Co-Ni-Ga and Co-Ni-Al systems have been investigated. It is shown that some compositions in the range Co-(l5-30) at percent Ni-30 at percent Ga and Co-(30-40) at percent Ni-30 at percent Al exhibit both the beta to beta' (L1_0) thermoelastic martensitic transformation and the para/ferromagnetic transition. Some of these undergo the martensitic transformation from the paramagnetic beta to the ferromagnetic beta'. The introduction of a small amount of the gamma phase into the beta phase by heat treatment, based on the results of the beta/gamma phase equilibria study in these systems, is shown to significantly improve the ductility in both alloy systems. The new beta single phase and beta + gamma two-phase ferromagnetic shape memory alloys (FSMAs) of the Co-Ni-Ga and Co-Ni-Al systems hold great promise as new smart materials.
机译：研究了Co-Ni-Ga和Co-Ni-Al系统的β（B2）相区域中的相平衡，马氏体和磁性相变。结果表明，在Co-（15-30），Ni-30百分比，Ga百分比和Co-（30-40），Ni-30百分比，Al百分比范围内的某些成分同时具有β到β'（L1_0）热弹性马氏体转变和顺/铁磁转变。其中一些经历了从顺磁性β到铁磁性β'的马氏体转变。根据在这些系统中进行的β/γ相平衡研究的结果，通过热处理将少量的γ相引入β相，可显着改善两种合金系统的延展性。 Co-Ni-Ga和Co-Ni-Al系统的新型β单相和β+γ两相铁磁形状记忆合金（FSMA）有望作为新型智能材料。

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