(北京有色金属研究总院，北京100088)
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492 MPa；时效前经4%预拉伸变形后，合金出现峰值的时间是18 h，对应的σb为508 MPa。
关键字: Al-Cu-Mg-Ag合金；预拉伸；析出相；力学性能
mechanical properties of Al-Cu-Mg-Ag alloy
（General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract: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.
Key words: Al-Cu-Mg-Ag alloy; prestretching; precipitated phase; mechanical properties
