| 7475铝合金电致超塑性效应中位错运动的动力学分析 |
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| 引用本文： | 董晓华,侯东芳,李尧,王选择.7475铝合金电致超塑性效应中位错运动的动力学分析[J].装备环境工程,2004,22(1):37-40. |
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| 作者姓名： | 董晓华 侯东芳 李尧 王选择 |
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| 作者单位： | 三峡大学机械与材料学院，西安交通大学材料科学与工程学院，江汉大学机电与建筑工程学院，三峡大学机械与材料学院 湖北宜昌443002，陕西西安710049，湖北武汉430019，湖北宜昌443002 |
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| 基金项目： | 国家自然基金资助项目(59201010)，湖北省教委科研计划项目(98C099) |
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| 摘 要： | 在7475铝合金的超塑性变形过程中对试样通以脉冲电流,发现脉冲电流能提高该合金的超塑性变形性能,并使晶内位错呈顺电子流动方向排列的形态。分析认为这种位错形态产生于电子风力对位错运动的促进作用。对于位错电子风力的计算引入了两种方法,这两种计算方法所得出的位错电子风力都与电流密度成正比。
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| 关 键 词： | 超塑性成形 位错 脉冲电流 7475铝合金 |
| 文章编号： | 1000-8446(2004)01-0037-04 |
| 修稿时间： | 2003年9月16日 |
The Kinetic Analysis of Dislocation Movement in the Electro-superplastic Effect of 7475 Al Alloy |
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| DONG Xiao-hua,HOU Dong-fang,LI Yao,WANG Xuan-zhe.The Kinetic Analysis of Dislocation Movement in the Electro-superplastic Effect of 7475 Al Alloy[J].Equipment Environmental Engineering,2004,22(1):37-40. |
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| Authors: | DONG Xiao-hua HOU Dong-fang LI Yao WANG Xuan-zhe |
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| Institution: | DONG Xiao-hua~1,HOU Dong-fang~2,LI Yao~3,WANG Xuan-zhe~1 |
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| Abstract: | Current pulses were introduced into 7475 Al alloy when undergoing superplastic deformation. The currents were found to be able to strengthen its superplastic deformation ability, and enable the dislocations inside the deformed metals arranged along the direction parallel to the flowing direction of electrons. This unique dislocation morphology is considered coming from the electron-wind-force enhanced dislocation mobility. Two methods are adopted to calculate the electron-wind-force. Both approaches draw the same conclusion that the electron wind force is proportional to the electric density. |
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| Keywords: | superplastic deformation dislocation current pulse 7475 Al alloy |
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