铁磁形状记忆合金Ni2MnGa多晶的磁-力学特性  

Magneto-mechanical characteristics of ferromagnetic shape memory alloy Ni_2MnGa polycrystals

作　　者：王省哲[1] 何宝明[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,土木工程与力学学院,甘肃兰州730000

出　　处：《功能材料》2008年第8期1272-1275,共4页Journal of Functional Materials

基　　金：国家自然科学基金(10502022);教育部新世纪优秀人才支持计划资助项目(NCET-050878)

摘　　要：对外加磁场、应力场共同作用下的铁磁形状记忆合金多晶的磁-力学特性进行了实验测试与研究,分别获得了两种组分Ni_(52)Mn_(27)Ga_(21)和Ni_(54)Mn_(25)Ga_(21)多晶样品在不同磁场倾角下、不同预加应力下的磁化曲线和磁滞回线;以及不同外加磁场及磁场倾角下的应力-应变曲线和磁致应变曲线等磁-力学特性曲线。结果表明铁磁形状记忆合金多晶沿样品轴向所测的饱和磁化强度随磁场倾角的增大而减小,施加预应力并不显著影响样品的磁化曲线和磁滞回线;各种角度时不同磁场对两种多晶样品的应力-应变关系影响均很小。The effects of applied axial pre-compressive stresses and magnetic fields on the magneto-mechanical characteristics of ferromagnetic shape memory alloys Ni52 Mn27 Ga21 and Ni, Mn25 Ga21 polycrystalline samples have been studied experimentally in present paper. The magnetization curves and magnetization hysteresis loops measured along axial direction of the two kinds of samples with different inclination angles of applied magnetic fields and axial pre-compressive stresses were obtained,as well as stress-strain loops and magnetostrain curves. The experimental results showed that the saturation magnetization values measured along axial direction of the samples decrease with the inclination angle of applied magnetic fields increases. The pre-compressive stresses have no obvious effect on the magnetization curve and magnetization hysteresis loop. The applied magnetic fields with different inclination angles show little effect on the stress-strain loop.

关 键 词：铁磁形状记忆合金 多晶样品 磁-力特性 磁滞回线 应力-应变回线 

分 类 号：TB381[一般工业技术—材料科学与工程]