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LF 6铝合金经大变形量冷轧、热轧及随后再结晶退火可得到均匀细小的晶粒组织。在最佳超塑温度和拉伸速度下,可呈现出较高的超塑性。试验中延伸率最高可达500%。研究了晶粒尺寸随变形温度和变形量及变形时间的变形关系。认为在变形量小于50%时,热效应引起的晶粒长大起主要作用;当变形大于100%时,由变形引起的晶粒长大超过热效应引起的晶粒长大,应变对晶粒的作用使得晶粒沿拉伸方向优先长大,呈长轴晶粒状。而受热控制长大的晶粒呈等轴状。
LF 6 aluminum alloy by a large amount of deformation cold-rolled, hot-rolled and then recrystallization annealing can be uniform and fine grain structure. In the best superplastic temperature and tensile speed, can show a higher superplasticity. Elongation test up to 500%. The relationship between grain size and deformation temperature and deformation and deformation time was studied. It is considered that the grain growth caused by the thermal effect plays a major role when the deformation is less than 50%. When the deformation is greater than 100%, the grain growth caused by the deformation exceeds the grain growth caused by the thermal effect and the effect of strain on the grain Make the grain grow preferentially along the stretching direction, showing long-axis grain shape. The grains grown under the control of heat were equiaxed.