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通过单向温拉伸试验以及扫描电镜和透射电镜观察,研究了汽车用5182铝合金板在变形温度为323~573 K,应变速率为0.001~0.1 s-1条件下的流变行为及微观组织。结果表明,在变形温度≥448 K、应变速率.ε=0.001 s-1条件下,5182合金出现明显的峰值应力,而当应变速率0.01~0.1 s-1时,合金的流变应力呈现稳态;当应变速率.ε=0.001 s-1时,随着变形温度的升高,合金单向温拉伸断口由典型的混合型断裂特征演变成典型的韧性断裂特征,合金产生了动态再结晶。
The uniaxial tensile test, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate the rheological behavior and microstructure of 5182 aluminum alloy for automotive applications under the conditions of deformation temperature of 323-573 K and strain rate of 0.001-0.1 s-1 . The results show that the 5182 alloy exhibits obvious peak stress at deformation temperature ≥448 K and strain rate ε = 0.001 s-1, while the flow stress of the alloy exhibits steady state at the strain rate of 0.01-0.1 s-1 When strain rate ε = 0.001 s-1, with the increase of deformation temperature, the uniaxial tensile tensile fracture of the alloy evolves into a typical ductile fracture characteristic from typical mixed fracture characteristics, and the alloy has a dynamic recrystallization.