利用OM, SEM, EDX, XRD, DSC和VSM研究了用Sb替代Al对Co41Ni32Al27合金马氏体相变和磁性的影响. 结果表明Co41Ni32Al26Sb1合金仍然生成L10型马氏体, 其马氏体相变温度和Curie点与淬火温度成正比关系, 淬火温度每升高10 K, 马氏体相变温度约提高9 K, 而Curie点约提高7.5 K. 相同淬火温度下Co41Ni32Al26Sb1合金的马氏体相变温度比Co41Ni32Al27合金约高70 K, 而Curie点也高出15 K. Co41Ni32Al26Sb1在1623 K热处理时出现共晶组织,发生部分熔化现象. 特别重要的是Co41Ni32Al26Sb1合金的马氏体相变温度范围大幅度缩小, 为20—28 K, 只有Co41Ni32Al27合金的一半, 有利于获得大磁致应变. 用平均s+d总电子浓度和平均磁价电子数分别解释了马氏体相变温度和Curie点的变化.
Influence of 1 at.% Sb addition on martensitic transformation and Curie point of Co41Ni32Al27 alloy is investigated for the first time by optical metallograph, SEM, EDX, XRD, DSC and VSM methods. The results show that martensitic crystal structure of Co41Ni32Al26Sb1 alloy is still L10 type. Both martensitic transformation temperature Tm and Curie point Tc is linear relation to quenching temperature. Tm increase 9K and Tc increase 7.5K for every 10K increasing in quenched temperature. Quenched from same temperature, Tm of Co41Ni32Al26Sb1 alloy is higher than that of Co41Ni32Al27 alloy by 70K，meanwhile Tc is higher by 15K. The melting point of Co-Ni-Al alloy decreases by the Sb addition, eutectic structure appears in Co41Ni32Al26Sb1 alloy annealed at 1623K, indicated that the alloy is partial melted. The martensitic transformation temperature range of Co41Ni32Al26Sb1 alloy is 20-28K, less than half that of Co41Ni32Al27 alloy. This is a very important result to benefit the achievement of large magnetic field induced strain on Co-Ni-Al based alloy. The results of Tm and Tc were explained by total average s+d electron concentration and magnetic valence number Zm separately.
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