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采用双通道等径侧面挤压剧烈塑性变形工艺提高AA5083铝合金的力学性能。采用多组实验研究路径类型(A和B路径)和挤压道次对材料力学性能的影响。挤压道次为6道次,挤压温度范围为573~473 K,采用金相、硬度测试和拉伸测试研究这些工艺参数的影响。硬度测试表明经6道次挤压后,硬度提高了64%,且分布均匀。屈服强度和抗拉强度分别提高了107%和46%。这是由于晶粒的剧烈剪切变形和变形温度降低导致的晶粒细化。TEM结果表明,经DECLE 6道次变形后,合金的平均晶粒尺寸从退火态的100μm减小至200 nm。对比研究了路径A和B的实验结果,并得到一些重要结论。
The mechanical properties of AA5083 aluminum alloy are improved by the severe plastic deformation process of double channel equal diameter side extrusion. Multiple sets of experiments were used to study the effect of path types (A and B paths) and extrusion pass on the material mechanical properties. The extrusion pass was 6 passes and the extrusion temperature range was 573-473 K. Metallographic, hardness and tensile tests were used to study the effects of these process parameters. Hardness tests showed that after 6 passes the hardness increased by 64% and the distribution was even. Yield strength and tensile strength increased by 107% and 46% respectively. This is due to the severe grain shear deformation and deformation temperature reduction caused by the grain refinement. The results of TEM show that the average grain size of the alloy decreases from 100 μm in the annealed state to 200 nm after DECLE 6 passes. The experimental results of paths A and B are compared and some important conclusions are obtained.