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研究了喷射沉积再经过热变形处理的 5 0 83Al Mg合金的超塑性。喷射沉积 5 0 83Al Mg合金的微观组织是由平均尺寸 15 μm的等轴晶组成 ,组织中的气孔率为 0 1% 5 % (体积百分数 )。采用了两种不同的热变形处理工艺 (TMP)来闭合气孔和细化晶粒 :先挤压后轧制和直接轧制。采用先挤压后轧制工艺处理的合金表现出了相对较高的超塑性 ,最大超塑延伸率可达 4 6 5 % ,而采用直接轧制工艺处理的合金最大超塑延伸率为 2 95 %。两种工艺处理后的合金表现出了相似的应力 -应变行为和应变速率敏感因子 ,应变速率敏感因子取值范围为 0 3 0 5。超塑延伸率的差异可能是由闭合气孔导致的变形过程中空洞的形核能力不同造成的。
The superplasticity of 5 0 83 Al Mg alloy after spray deposition and thermal deformation treatment was studied. Spray deposition The microstructure of the 530AlMg alloy is composed of equiaxed grains with an average size of 15 μm with a porosity of 0 1% 5% by volume. Two different thermal deformation processes (TMP) were used to close the pores and refine the grains: first post-extrusion rolling and direct rolling. The alloy treated by the first extrusion rolling process showed a relatively high superplasticity, the maximum superplastic elongation of up to 465%, while the maximum superplastic elongation of the alloy treated by the direct rolling process was 2 95 %. The alloys treated by the two processes show similar stress-strain behavior and strain rate sensitivity factor, and the strain rate sensitivity factor is in the range of 0 3 0 5. The difference in superplastic elongation may be caused by the difference in the nucleation ability of the hollow during deformation due to the closed stomata.