应变速率对7050铝合金塑性成形性能与动态再结晶的影响
Effects of Strain Rate on Plastic Formation and Dynamic Recrystallization of 7050 Aluminum Alloy
杨 平
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作者单位：重庆电子工程职业学院 机电工程系, 重庆 401331
中文关键字：应变速率； 7050铝合金； 动态再结晶； 晶粒尺寸
英文关键字：strain rate; 7050 aluminum alloy; dynamic recrystallization; grain size
中文摘要：利用刚粘塑性有限元与动态再结晶演化热力耦合的方法，进行了7050铝合金热压缩过程变形与动态再结晶的热力耦合模拟，讨论了应变速率对7050铝合金塑性成形与动态再结晶的影响。 模拟结果表明，热变形过程中，试样的各个部位的变形分布不均匀，心部的等效应变最大，变形的不均匀性随应变速率的增大而增大，但是变化的程度不大；试样内部各部位的应力大小分布不均匀，随应变速率的增大，最小应力值由自由变形的鼓形区域逐步向心部移动；动态再结晶晶粒尺寸标准偏差随应变速率的增加而减小。
英文摘要：The coupled thermo-mechanical simulation of deformation and dynamic recrystallization of 7050 aluminum alloy was carried out using coupled thermo-mechanical analysis method of rigid viscoplastic finite element and the evolution of dynamic recrystallization. The effects of strain rate on plastic formation and dynamic recrystallization of 7050 aluminum alloy were discussed. The results show that the deformation of the specimen is inhomogeneous, and the effective strain in the center of the specimen is maximum. The deformation inhomogeneity increases with the increase of strain rate. The effective stress of specimen is inhomogeneous. As the strain rate increases, the minimum stress value moves from the drum-shaped region to the heart of specimen. The standard deviation of dynamic recrystallization grain size decreases with the increase of strain rate.