Structural transition of Ni-Mn-Ga ferromagnetic shape memory alloy particles prepared by ball milling

摘要：

The size,crystal structure and phase transformation of Ni49.8Mn28.5Ga21.7 alloy particles prepared by planetary ball milling (PBM) and vibration ball milling (VBM) were investigated by SEM,XRD and DSC.The results show that the particles milled by PBM for 4 h exhibit irregular polyhedron,with the size distribution between 5 μm and 40 μm.These particles present disordered fct structure with no phase transformation behaviour.When annealed at 600 ℃ for 1 h,the crystal structure of the particles evolves from disordered fct to Heusler completely.The particles milled by VBM for 4 h exhibit flaky shape,with the size distribution from 3 μm to 30 μm.The particles present disordered fcc structure with no phase transformation behaviour.However the crystal structure of these particles doesn’t transform from disordered fcc to Heusler completely after annealing at 600 ℃ for 1 h,for the severe lattice distortion induced in the VBM process is not eliminated entirely.

关键词： Ni-Mn-Ga alloy particles structural transition phase transformation ball milling

作者: CHEN Feng TIAN Bing LI Li ZHENG Yu-feng

作者单位: Center for Biomedical Materials and Engineering,Harbin Engineering University,Harbin 150001,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）