四川大学学报：工程科学版2011，Vol.43Issue(4)：227-231,235,6.
时效时间对新型高强铸造Al-Cu-Mn合金性能和微观组织的影响
Influence of Aging Time on Mechanical Properties and Microstructures of Al-Cu-Mn Casting Aluminum Alloy
摘要
Abstract
The influence of aging time at 175 ℃ on the tensile strength（σb）,elongation（δ） and microstructures of Al-Cu-Mn casting aluminum alloy after（540±5） ℃ solution treatment for 14 h were investigated.The results showed that,the suitable aging time range is from 3 h to 8 h,during which the tensile strength would be greater than 455 Mpa and at the same time the elongation would be greater than 8%,the peak value of σb reaches 480 MPa when the aging time is 5 h,the corresponding elongation is 8.2%.The aging time has a little influence on the tensile strength,because the main strengthening mechanism is the dispersion strengthening of precipitate phase θ′ in matrix and the second T phase in grains.The elongation decreases with the increase of aging time,moreover,when the aging time is greater than 10 h,the elongation would be lowered distinctly and the value is less than 5.0%.The reason could be attributed to the fact that when the aging time is greater than 10 h,the appearance of Grain Precipitates on Boundary（GPB） changes from chain to bulky block,the Precipitation Free Zone（PFZ） is widened excessively,serious segregation of second T phase and blank area happens within grains,the matrix separated by the net-type grain boundary.All of above mentioned microstructures reduce the ductility of Al-Cu-Mn casting aluminum alloy.关键词
Al-Cu合金/时效强化/拉伸强度/延伸率/微观组织Key words
aluminum copper alloys/age hardening/tensile strength/elongation/microstructure分类
矿业与冶金引用本文复制引用
毛健,李利华,张晓敏,卢锦德,涂铭旌..时效时间对新型高强铸造Al-Cu-Mn合金性能和微观组织的影响[J].四川大学学报：工程科学版,2011,43(4):227-231,235,6.基金项目
国家科技支撑计划基金资助项目 （）
