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采用定向凝固方法制备Ni50-xMn29+xGa21(x=0～4)系列多晶合金,并研究合金组分对马氏体相变温度和磁性能的影响。结果表明,当x≤3时,合金的马氏体相变温度Ms随着x的增大而升高,而马氏体相变滞后△T随x的增大而减小;当x=3时,Ms升高到309.6K,居里温度Tc为360K;但是随着合金中Mn继续替代Ni,即x=4时,Ms降低到283.2K,Tc为362K。室温下测量Ni47Mn32Ga21样品的磁感生应变,无应力下其饱和磁感生应变值达到了–700×10-6,对应的磁场强度为4.5×105A/m。
The polycrystalline Ni50-xMn29 + xGa21 (x = 0 ~ 4) polycrystalline alloys were prepared by directional solidification and the effects of alloy compositions on the martensitic transformation temperature and magnetic properties were investigated. The results show that when x≤3, the martensite transformation temperature Ms of the alloy increases with the increase of x, while the martensite transformation delay ΔT decreases with the increase of x. When x = 3 , Ms increased to 309.6K and Curie temperature Tc was 360K. However, with the continuous substitution of Mn for Ni in the alloy, Ms decreased to 283.2K and Tc was 362K when x = 4. The magnetic induction strain of Ni47Mn32Ga21 sample was measured at room temperature, and the value of its saturation magnetization strain reached -700 × 10-6 under no stress. The corresponding magnetic field strength was 4.5 × 105A / m.