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《Transactions of Materials and Heat Treatment》 2006-03
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Martensitic and magnetic transition of Ni_(54)Al_(25)Fe_(21-x)Co_x alloy

LUO Feng-hua~1,CHEN Jia-yan~2,OIKAWA Katsunari~3,ISHIDA Kiyohito~3(1.State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China;2.Central Iron and Steel Research Institute,Beijing,100081,China;3.Department of Materials Science,Graduate School of Engineering,Tohoku University,Sendai 980-8579,Japan)  
Ni-Al-Fe alloy with a β phase crystal structure is a conventional shape memory alloy.The alloy exhibits ferromagnetic characteristics with the increasing of Fe element concentration and thus it is a promising ferromagnetic shape memory alloy.The influence of cobalt concentration x on martensitic transformation temperature and Curie point of Ni_(54)Al_(25)Fe_(21-x)Co_x alloys were investigated by optical micrography,SEM,DSC and VSM and EDX analysis.It is found that the martensitic transformation temperatures of Ni_(54)Al_(25)Fe_(21-x)Co_x alloys are linealy increased with the increasing of Co concentration x.1% Co can increase the martensitic transition temperature by 30K for the alloys quenched from 1623K and by 38K for the alloys quenched from 1373K.Martensitic transformation temperature and Curie point decrease quickly for the alloys quenched at lower temperature.With the increasing of Co concentration x,the influence of quenching temperature on martensitic transformation temperature and Curie point is weakened.No significant influence of Co concentration on Curie point is observed.A T_c peak exists on T_c-x curves.For example,the maximum value of T_c is 256K for Ni_(54)Al_(25)Fe_(19)Co_2 alloy quenched from 1623K.Martensitic transformation temperatures of the alloys are discussed by average s+d electron concentration(e/a),meanwhile,their Curie points are explained by the combined effects of Al content and crystal structure ordered degree of β phase at first time.
【Fund】: 教育部留学回国人员科研启动基金资助项目
【CateGory Index】: TG139.6
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