| Cu—Ni—Al形状记忆合金形变、相变以及裂纹形核的相互关系 |
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| 引用本文： | 陆永浩,乔利杰,褚武扬. Cu—Ni—Al形状记忆合金形变、相变以及裂纹形核的相互关系[J]. 金属学报, 2001, 37(7): 686-690 |
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| 作者姓名： | 陆永浩 乔利杰 褚武扬 |
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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： | 国家重点基础研究专项课题 G1990650，国家自然科学基金19891180资助项目 |
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| 摘 要： | 采用金相显微镜和扫描电镜原位拉伸技术研究了Cu-Ni-Al形状记忆合金中的马氏体形变、马氏体相变以及微裂纹形核三者之间的关系。结果表明，拉伸时缺口前方首先形成可逆变的马氏体而不出现滑移带，微裂纹沿马氏体和母相界面形核，只有当裂纹扩展－段距离且应力集中足够大后，才有可能出现形变带，此时微裂纹将沿形变带和马氏体界面交替形核。
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| 关 键 词： | Cu－Ni－Al合金 原位拉伸 裂纹 马氏体 形变带 |
| 文章编号： | 0412-1961(2001)07-0686-05 |
| 修稿时间： | 2000-11-30 |
THE RELATIONSHIP BETWEEN MARTENSITIC TRANSFORMATION, DEFORMATION AND MICROCRACK NUCLEATION IN Cu-Ni-Al ALLOYS |
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| LU Yonghao,QIAO Lijie,CHU Wuyang. THE RELATIONSHIP BETWEEN MARTENSITIC TRANSFORMATION, DEFORMATION AND MICROCRACK NUCLEATION IN Cu-Ni-Al ALLOYS[J]. Acta Metallurgica Sinica, 2001, 37(7): 686-690 |
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| Authors: | LU Yonghao QIAO Lijie CHU Wuyang |
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| Abstract: | The relationship between martensitic transformation, deformation and microcrack nucleation was investigated using in situ straining methods under optical microscopy and scanning electron microscopy. The results indicated that the reversible martensite rather than slip bands first formed ahead of the notch during loading, and the microcracks nucleated along martensite/parent interface. Only after the crack propagsted a definite distance and the stress concentration was large enough, the slip bands formed. In this condition the microcracks nucleated alternatively along martensite/parent interface and slip bands. |
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| Keywords: | Cu-Ni-Al alloy in situ tension crack martensite slip band |
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