中南大学学报（自然科学版）2012，Vol.43Issue(3)：855-863,9.
固溶处理对7050铝合金强度和断裂韧性的影响
Influence of solution heat treatment on strength and fracture toughness of aluminum alloy 7050
摘要
Abstract
The influences of the solution heat treatment on the tensile properties and fracture toughness of the 7050 aluminum alloy were investigated by means of optical microscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), the ambient temperature tensile tests and compact tension toughness testes. The results show that during the single-stage solution heat treatment, with the increase of solution temperature, coarse constituent particles are dissolved, and meanwhile, the percentage of recrystallization and the size of the subgrains increase. With the increase of solution temperature, the strength and fracture toughness firstly increase and then decrease. The two-stage solution heat treatment results in improved dissolution of coarse constituent particles, low recrystallization percentage and small size of subgrains. The strength and fracture toughness during the two-stage solution heat treatment are larger than the maximum of the single-stage solution heat treatment. The percentage of recrystallization and the size of the subgrains are small after pre-precipitation following solution heat treatment, but a large number of η phase aggregates at the subgrain boundary. Meanwhile, constituent particles dissolve out again from the matrix, which leads to the decrease of the strength and fracture toughness.关键词
7050铝合金/固溶处理/强度/断裂韧性Key words
aluminium alloy7050/ solution heat treatment/ strength/ 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,何道广,张荣..固溶处理对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(3):855-863,9.基金项目
国家重点基础研究发展规划(“973”计划)项目(2005CB623700) （“973”计划）
