Effect of Ni excess on phase transformation temperatures of NiMnGa alloys

Effect of Ni excess on phase transformation temperatures of NiMnGa alloys
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Ni过量对NiMnGa合金相变温度的影响

DOI:
10.1016/s0921-5093(02)00288-5
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发表时间:
2003-02
期刊:
Mater Sci Eng A
影响因子:
--
通讯作者:
Xu HB
Xu HB
中科院分区:
其他
文献类型:
--
作者:
Jiang CB;Feng G;Gong SK;Xu HB

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在非化学计量比的NiMnGa合金中,系统地用Ni取代了Mn、Ga或同时替代了Mn和Ga。详细研究了Ni过量NiMnGa合金的成分、组织与马氏体相变温度之间的关系。从低于0°C到300°C,三个系列的马氏体相变温度几乎都随着Ni含量的增加而线性增加,马氏体相变温度的上升速度不同。Ni对Ga的替代作用较大,对Mn的作用较慢,对Mn和Ga的作用居中。认为尺寸因素和电子浓度对NiMnGa合金的马氏体相变温度有影响。所确定的关系对于设计合适的NiMnGa合金以及在特定温度下使用所需的马氏体相变温度具有重要意义。
A systematic substitution of Ni for Mn, Ga, or both Mn and Ga in the non-stoichiometric NiMnGa alloys is performed. The relationship among the composition, structure and martensitic transformation temperatures was studied in detail for the Ni excessive NiMnGa alloys. The martensitic transformation temperatures almost linearly increase with increasing Ni content in all the three series from lower than 0°C up to 300°C. The increases in rate of the martensitic transformation temperatures are different for the three cases. It is large for Ga substituted by Ni, slow for Mn and intermediate for both Mn and Ga. The size factor and electronic concentrations are thought to influence the martensitic transformation temperature in the NiMnGa alloys. The determined relationship will be significant for designing a suitable NiMnGa alloy with a required martensitic transformation temperature for application at a specific temperature.
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发表时间: 1999-09-01
影响因子: 2.1
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通讯作者: Kokorin, VV
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