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研究了细晶LC_4铝合金在400—520℃温度范围内,初始应变速率为10~(-2)—10~(-4)S~(-1)条件下拉伸时的力学行为及显微空洞的变化。结果表明材料呈现出良好的各向同性。平行及垂直于轧向拉伸到相同应变时空洞分布相同,并且空洞总是沿平行于拉仲轴的方向排列。进一步分析可以说明空洞不是在形变热处理当中大的Fe,Si夹杂物处形核,空洞形核主要发生在超塑变形中。
The mechanical behavior and microstructure of fine grained LC_4 aluminum alloy under tension at the temperature range of 400-520 ℃ and initial strain rate of 10 ~ (-2) -10 ~ (-4) S ~ (-1) Void changes. The results show that the material exhibits good isotropy. The distribution of holes is the same for parallel and perpendicular stretches to the same strain in the rolling direction, and the voids are always arranged parallel to the drawing axis. Further analysis shows that the void is not nucleation of large Fe and Si inclusions in the heat treatment of the deformation, and the void nucleation mainly occurs in the superplastic deformation.