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采用电弧熔炼法制备Co38Ni34Al27Mn1磁控形状记忆合金,并对合金进行热处理。采用金相显微镜、X射线衍射仪及振动样品磁强计等研究热处理工艺对Co38Ni34Al27Mn1合金显微组织、相结构及磁性能的影响。研究结果表明:1573 K加热冰水淬火后得到β相和γ相,而1623、1673 K加热冰水淬火后合金中可观察到板条状马氏体,且β相、γ相和马氏体相共存。随着热处理温度的提高,合金晶粒长大,γ相体积分数减小,马氏体含量增加,饱和磁化强度从42.51 emu.g-1增加到45.43 emu.g-1,矫顽力从48 Oe减小到30 Oe;在1673 K淬火,随加热保温时间的增加合金晶粒变大,饱和磁化强度从44.31 emu.g-1增加到47.29 emu.g-1。
The Co38Ni34Al27Mn1 magnetron shape memory alloy was prepared by electric arc melting and the alloy was heat-treated. The effects of heat treatment on the microstructure, phase structure and magnetic properties of Co38Ni34Al27Mn1 alloy were investigated by metallographic microscope, X-ray diffraction and vibrating sample magnetometer. The results show that β-phase and γ-phase are obtained after 1573 K heated ice-water quenching, while lath martensite is observed in the alloy quenched by 1623 and 1673 K heated ice-water, and the β phase, γ phase and martensite Co-existence. With the increase of the heat treatment temperature, the grain size of the alloy grows, the γ phase volume fraction decreases, the martensite content increases, the saturation magnetization increases from 42.51 emu.g-1 to 45.43 emu.g-1, and the coercivity increases from 48 Oe decreased to 30 Oe. At 1673 K quenching, the alloy grain became larger with the increase of heat holding time, and the saturation magnetization increased from 44.31 emu.g-1 to 47.29 emu.g-1.