| 脉冲电流对Zn－22％Al合金组织及断裂行为的影响 |
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| 引用本文： | 李尧,宋子凯.脉冲电流对Zn－22％Al合金组织及断裂行为的影响[J].上海有色金属,1996(3). |
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| 作者姓名： | 李尧 宋子凯 |
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| 作者单位： | 湖北工学院机械系 |
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| 基金项目： | 国家自然科学基金,湖北省自然科学基金 |
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| 摘 要： | 本文借助于透射电镜和扫描电镜，观察了Ｚｎ－２２％Ａｌ合金超塑变形时，脉冲电流对其组织和断裂行为的影响。研究表明，施加脉冲电流，合金中各部分晶粒变形是不均匀的，局部发生动态回复和动态再结晶，同时保留着纤维状或放射状的变形组织。合金的断裂是通过晶界开裂、扩展、最终断裂，表现出沿晶断裂机制。
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| 关 键 词： | Zn－22％Al合金 脉冲电流 动态回复 动态再结晶 断裂 |
INFLUENCE OF IMPULSE CURRENT ON THE STRUCTURE AND FAILURE BEHAVIOR OF Zn-22% AI ALLOY |
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| Li Yao,Song Zikai.INFLUENCE OF IMPULSE CURRENT ON THE STRUCTURE AND FAILURE BEHAVIOR OF Zn-22% AI ALLOY[J].Shanghai Nonferrous Metals,1996(3). |
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| Authors: | Li Yao Song Zikai |
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| Abstract: | By the aid of transmission electrical lense and scanning lense, the influence of impulse current on the structure and failure behvior of Zn-22% Al alloy is surveyed while the alloy is under superplastic deformation, The study indicates that deformation of crystals in various parts of alloy is not uniform us impulse current is applied; dynamic restoration and dynamic recrystallization take place localy, as the fibric form and radiating form of deformation structure are remained simultaneously. The alloy is foiled by this way: micro-fractures rise firstly on the boundary of crystals, propagate then and fail at last. It seems that the mechanism of the failure is intergranulur. |
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| Keywords: | Zn-22% Al alloy Impulse current Dynamic restoration Dynamic recrystallizaton failure |
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