中南大学学报（自然科学版）2012，Vol.43Issue(9)：3363-3371,9.
断续时效对7050铝合金强度和断裂韧性的影响
Effects of interrupt aging on strength and fracture toughness of 7050 aluminum alloy
摘要
Abstract
The effects of the interrupt aging on the tensile property and fracture toughness of 7050 aluminum alloy were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, tensile and toughness tests. The results show that with the increase of the secondary aging time, the strength of the interrupt aged alloys first increases and then decreases. Meanwhile, the fracture toughness first increases and then decreases. Secondary precipitation takes place in the low temperature aging process, which results in higher strength than that of the peak aged alloy. With the increase of the secondary aging time, the precipitates at grain boundaries of the interrupt aged alloy become coarser and discontinuous, which leads to higher fracture toughness than that of the peak aged alloy. The main fracture mechanism changes from shear transgranular fracture to intergranular fracture, and then to transgranular fracture.关键词
7050铝合金/断续时效/拉伸性能/断裂韧性Key words
7050 aluminum alloy/interrupt aging/tensile property/fracture toughness分类
矿业与冶金引用本文复制引用
韩念梅,张新明,刘胜胆,陆艳红,何道广,张荣..断续时效对7050铝合金强度和断裂韧性的影响[J].中南大学学报（自然科学版）,2012,43(9):3363-3371,9.基金项目
国家重点基础研究发展规划("973"计划)项目(2012CB619501) （"973"计划）
