冷加工和时效处理顺序对6061铝合金力学性能的影响

摘要

The influence of combination of different designated precipitation hardening and cold working on the tensile properties of 6061 aluminum alloy was investigated.The results indicate that applying single aging at 180 ℃ for 4 h in different thermal-mechanical treatments improves both the strength and elongation.However,double aging does not improve the mechanical properties.In addition,pre-aging shows a negative effect on the subsequent precipitation hardening of material.The changes in mechanical properties were discussed by explanation of mierostructural evolution due to the competition of precipitation hardening,strain hardening and work softening processes.%研究不同的析出硬化和冷加工组合对6061铝合金拉伸性能的影响.结果表明,在不同的热处理过程中,在180℃单时效4 h能提高合金的强度和伸长率.然而,双时效处理不能改善其力学性能.另外,预时效对随后的析出硬化有负面影响.合金力学性能的变化归因于析出硬化、应变硬化和加工软化的竞争而引起的显微组织演变.