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本文展示出 LC4铝合金在500℃下,以不同应变速率和给定不同应变量后的超塑装形电子衍衬象。对微观形貌的综合分析表明:该合金的超塑变形机制为 Gifkins 模型。晶界滑移由品界位错协词:大块化合物与基体界面间的变形,由大块化合物周围的位错协凋。试验中发现的蛇形流纹、“Z”字形位错和位错环,证明了该合金中同时存在着扩散蠕变的协调作用。
This article shows the superplastic shape of an LC4 aluminum alloy at 500 ° C with different strain rates and given varying amounts of strain. The comprehensive analysis of the microstructure shows that the superplastic deformation mechanism of the alloy is Gifkins model. The grain boundary slip is caused by the dislocation co-words in the product boundary: the deformation between the interface of the bulk compound and the matrix, and the dislocation around the bulk compound. The serpentine pattern, “Z” -shaped dislocation and dislocation loops found in the test proved the simultaneous coordination of diffusion creep in this alloy.