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

Structural transition of Ni-Mn-Ga ferromagnetic shape memory alloy particles prepared by ball milling
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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. The size, crystal structure and phase transformation of Ni49.8Mn28.sGa21.7 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 pm and 40 pm. 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 30μm. 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 aider annealing at 600 ℃ for 1 h, for the severe lattice distortion induced in the VBM process is not eliminated entirely.
作者 陈枫 田兵 李莉 郑玉峰
机构地区 Center for Biomedical Materials and Engineering
出处 《中国有色金属学会会刊：英文版》 CSCD 2007年第A02期614-617,共4页 Transactions of Nonferrous Metals Society of China
关键词 形状记忆合金 制备方法 球磨 结构转变 镍锰镓合金 Ni-Mn-Ga alloy particles structural transition phase transformation ball milling
分类号 TG115 [金属学及工艺—物理冶金]
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参考文献15

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中国有色金属学会会刊：英文版
2007年 第A02期

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