中南大学学报（自然科学版）2018，Vol.49Issue(4)：809-816,8.DOI:10.11817/j.issn.1672-7207.2018.04.006
基于正交试验的7085铝合金双级时效制度
Two-step aging treatment of 7085 alloy with orthogonal experiment
摘要
Abstract
The effect of pre-aging time, secondary aging temperature and time of two-step aging on hardness and conductivity of 7085 aluminum alloy was investigated by orthogonal experiment. The significant regularity was studied by variance analysis, and the influence of secondary aging temperature and time on microstructure and properties of 7085 aluminum alloy was investigated by means of tensile test, slow strain rate test (SSRT) and transmission electron microscopy (TEM). The results show that the significant regularity (from big to small) of three factors is secondary aging temperature, secondary aging time, pre-aging time η′phase transforms to η phase gradually, grain boundary precipitates become coarse and tend to be discontinuous with the increase of the secondary aging temperature and time. Thus, the strength of alloys decreases while the stress corrosion cracking (SCC) resistance increases. The influence of secondary aging temperature is more significant. During the optimal two-step aging treatment of 121℃/5 h+163℃/12 h, the tensile strength, yield strength, elongation and conductivity of the alloy are 530 MPa, 483 MPa, 12.6%, 22.9 MS/m, respectively.关键词
7085铝合金/正交试验/双级时效/拉伸性能/应力腐蚀Key words
7085 alloy/orthogonal experiment/two-step aging/tensile properties/stress corrosion分类
矿业与冶金引用本文复制引用
龙涛,邓运来,范世通,张研..基于正交试验的7085铝合金双级时效制度[J].中南大学学报（自然科学版）,2018,49(4):809-816,8.基金项目
国家重点基础研究发展计划(973计划)项目(2012CB619500) （973计划）
国家重点研发计划项目(2016YFB0300901) （2016YFB0300901）
国家自然科学基金资助项目(51375503)(Project(2012CB619500) supported by the National Basic Research Program (973 Program) of China （51375503）
Project(2016YFB0300901) supported by Major State Research Program of China （2016YFB0300901）
Projects(51375503) supported by the National Natural Science Foundation of China) （51375503）
