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本文通过拉伸试验研究了供应状态的LD10铝合金经简单预处理后所表现出的超塑性变形特性。在温度420～460℃,初始应变速率1.67—8.33×10~(-3)s~(-1)的范围内,可获得300％以上的延伸率。最佳变形温度为460℃,在此温度下以8.33×10~(-3)s~(-1)的初始应变速率变形时,延伸率达448.5％,流动应力为11MPa,m值为0.49。扫描电镜观察表明变形过程中空洞的长大与连接是导致拉伸试样断裂的直接原因。
In this paper, the superplastic deformation behavior of LD10 aluminum alloy supplied by simple pretreatment was studied by tensile test. In the temperature range of 420 ~ 460 ℃ and the initial strain rate of 1.67-8.33 × 10 ~ (-3) s ~ (-1), the elongation of 300% can be obtained. The optimum deformation temperature is 460 ℃. At this temperature, the elongation reaches 448.5% with the initial strain rate of 8.33 × 10 -3 s -1. The flow stress is 11 MPa and the m value is 0.49. Scanning electron microscopy observation shows that the growth and connection of voids during the deformation process are the direct causes of tensile specimen fracture.