预拉伸对Al-Cu-Mg-Ag合金析出相与力学性能的影响  

Effects of prestretching on precipitated phase and mechanical properties of Al-Cu-Mg-Ag alloy

作　　者：李周兵[1] 沈健[1] 雷文平[1] 闫亮明[1] 李俊鹏[1] 毛柏平[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《中国有色金属学报》2010年第8期1508-1512,共5页The Chinese Journal of Nonferrous Metals

摘　　要：研究时效前预拉伸对Al-Cu-Mg-Ag合金析出相和力学性能的影响。结果表明:165℃时效前的预拉伸可提高合金的峰值硬度及强度,延长峰值时效的时间;合金的主要强化相是Ω相和θ′相,预拉伸引入的位错抑制了Ω相的析出与长大,细化Ω相的尺寸,同时促进θ′相的析出;时效前未经变形时,合金出现峰值的时间是10h,对应的σb为492MPa;时效前经4%预拉伸变形后,合金出现峰值的时间是18h,对应的σb为508MPa。The effects of prestretching before aging on the precipitated phases and mechanical properties of Al-Cu-Mg-Ag alloy were studied.The results show that the prestretching before aging increases the peak hardness and tensile strength and increases the time of peak-ageing at 165℃.The main precipitated phases are Ω phase and θ＇ phase.The precipitation and growth of Ω phase are restrained by dislocation owing to prestretching,while the dislocation refines the size of Ω phase and also promotes the precipitation of θ＇ phase.The time of peak-aging for the alloy during non-prestretching emerges before aging is 10 h and the corresponding tensile strength is 492 MPa.The time of peak-ageing for the alloy during 4% prestretching emerges before aging is 18 h and the corresponding tensile strength is 508 MPa.

关 键 词：AL-CU-MG-AG合金 预拉伸 析出相 力学性能 

分 类 号：TG111.7[金属学及工艺—物理冶金] TG146.2[金属学及工艺—金属学]