| Ni2MnGa铁磁形状记忆合金开裂的原位研究 |
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| 引用本文： | 沈连成,何健英,宿彦京,褚武扬,乔利杰.Ni2MnGa铁磁形状记忆合金开裂的原位研究[J].金属学报,2006,42(8):810-814. |
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| 作者姓名： | 沈连成 何健英 宿彦京 褚武扬 乔利杰 |
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| 作者单位： | 北京科技大学材料物理系,北京,100083 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 对Ni2MnGa铁磁形状记忆合金的缺口试样，通过在微分干涉相衬显微镜下原位拉伸，研究了裂纹形核、扩展和马氏体相变以及塑性变形的关系．结果表明，拉伸时首先形成马氏体，当裂尖应力集中足够大时就会在裂尖产生局部塑性区，微裂纹易于沿马氏体界面形核，但也可在塑性区中形核．随载荷升高，微裂纹沿马氏体不连续形核，通过韧带剪切连接，从而导致裂纹扩展阻力也随裂纹扩展而增大．
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| 关 键 词： | 原位拉伸 马氏体 裂纹形核 |
| 文章编号： | 0412-1961（2006）08-0810-05 |
| 收稿时间： | 2005-12-05 |
| 修稿时间： | 2005-12-052006-03-16 |
IN SITU STUDY OF MARTENSITE TRANSFORMATION , PLASTIC DEFORMATION AND CRACK NUCLEATION FOR NI2MNGA FERROMAGNETIC SHAPE MEMORY ALLOY |
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| SHEN Liancheng,HE Jianying,SU Yanjing,CHU Wuyang,QIAO Lijie.IN SITU STUDY OF MARTENSITE TRANSFORMATION , PLASTIC DEFORMATION AND CRACK NUCLEATION FOR NI2MNGA FERROMAGNETIC SHAPE MEMORY ALLOY[J].Acta Metallurgica Sinica,2006,42(8):810-814. |
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| Authors: | SHEN Liancheng HE Jianying SU Yanjing CHU Wuyang QIAO Lijie |
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| Affiliation: | Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083 |
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| Abstract: | The relationship between crack nucleation,martensitic transformation and plastic deformation of Ni_2MnGa ferromagnetic shape memory alloy has been studied in situ using a differ- ential interference contrast(DIC)microscopy.The result showed that martensites formed first during loading and then a plastic zone appeared when the stress was increased further.Microcrack initiated preferentially along the interface of martensite,but also initiated in the plastic zone.With increasing the load,microcracks initiated discontinuously along the martensites and connected through shear fracture of the ligaments. |
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| Keywords: | Ni2MnGa |
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