定向生长Ni_(50-x)Mn_(29+x)Ga_(21)(x=0～4)合金的相变与磁感生应变  

Phase Transformation and Magnetic-Field-Induced Strain in Ni_(50-x)Mn_(29+x)Ga_(21)(x=0-4) Alloys

作　　者：薛双喜[1] 冯尚申[1] 蔡培阳[1] 李勤涛[1] 吴建波[1] 周英[1] 陈卫平[1] 

机构地区：[1]台州学院,浙江台州318000

出　　处：《稀有金属材料与工程》2010年第10期1764-1768,共5页Rare Metal Materials and Engineering

基　　金：浙江省科技厅重点项目(2006C21085);台州市科技计划项目(08KY11)

摘　　要：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。Ni50-xMn29+xGa21(x=0-4) polycrystalline alloys were prepared by the technique of directional solidification and the effect of the component on the martensitic transformation temperature and magnetic properties of the alloys was analyzed. The results show that the martensitic transformation temperatures (M-s) increase and the martensitic transformation hysteresis (Delta T) decrease with increasing of x when x <= 3. When x=3, M-s is increased to 309.6 K and the Curie temperature T-c is 360 K. But with x increasing continuously to 4, M-s decreases to 283.2 K and T-c is 362 K. The Ni47Mn32Ga21 alloy exhibits a large saturated magnetic-induced strain of -700x10(-6) without stress at room temperature, whose corresponding magnetization intensity is 4.5x10(5) A/m.

关 键 词：定向生长 合金组分 马氏体相变温度 磁感生应变 相变滞后 升高 居里温度 多晶合金 定向凝固 磁场强度 应变值 下测量 磁性能 应力 样品 室温 结果 法制 饱和 

分 类 号：TG139.6[一般工业技术—材料科学与工程]