Effect of γ precipitates on martensitic transformation and magnetic properties in aged Mn–Ni–Ga alloys

Effect of γ precipitates on martensitic transformation and magnetic properties in aged Mn–Ni–Ga alloys
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γ析出相对时效Mn-Ni-Ga合金马氏体相变和磁性能的影响

DOI:
10.1063/1.2943661
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发表时间:
2008-06
影响因子:
4
通讯作者:
--
中科院分区:
物理与天体物理2区
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--
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时效Mn50Ni25Ga25合金的差示扫描量热曲线观察到多个马氏体相变峰,相变温度随时效温度的变化而变化。在磁转变温度以上时效,磁性和矫顽力均得到增强。在873K时效时,合金的最大磁化强度可达54emu∕g,两相之间的磁化差为28emu∕g。而573K时效合金的矫顽力高达1.2kOe,具有较高的饱和场,这可以从畴壁钉钉的角度来理解。
Multiple martensitic transformation peaks were observed from differential scanning calorimetry curves in aged Mn50Ni25Ga25 alloys in which transformation temperature varied with aging temperature. The magnetization and coercivity were enhanced as a result of aging above magnetic transition temperature. A maximum magnetization up to 54emu∕g and a magnetization difference between two phases of 28emu∕g was achieved in the alloy aged at 873K. However, coercivity as large as 1.2kOe was obtained in 573K aged alloy, with a high saturation field, which can be understood in terms of domain wall pinning.
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