有色金属科学与工程2025，Vol.16Issue(5)：726-733,8.DOI:10.13264/j.cnki.ysjskx.2025.05.007
回归温度对Al-4.5Zn-1.3Mg合金显微组织及力学性能的影响
Effect of retrogression temperature on microstructure and mechanical properties of Al-4.5Zn-1.3Mg alloys
摘要
Abstract
Al-Zn-Mg alloys are widely used in rail vehicles due to their high specific strength and excellent mechanical properties.This paper investigated the effect of different temperature parameters on the hardness and mechanical properties of Al-4.5Zn-1.3Mg alloy after regression reheat treatment.It is found that,when the regression time is 105 min at 185℃,Al-4.5Zn-1.3Mg alloy can achieve excellent mechanical properties,such as a tensile strength of approximately 408 MPa and an elongation of about 15%.Through regression heat treatment,Al-4.5Zn-1.3Mg alloy can not only retain sufficient GP zones to avoid excessive dissolution,and promote the precipitation and coarsening of η'phases during re-aging processes,but also the precipitated phases at grain boundaries are discontinuously distributed and form a precipitate-free zone(PFZ)of suitable width,which improves the plasticity of aluminum alloy.Therefore,reasonably controlling the regression temperature can achieve good strength and plasticity of Al-4.5Zn-1.3Mg alloys.关键词
Al-4.5Zn-1.3Mg铝合金/回归再时效/显微组织/力学性能Key words
Al-4.5Zn-1.3Mg alloy/retrogression re-ageing/microstructure/mechanical properties分类
金属材料引用本文复制引用
林化强,丁叁叁,田爱琴,陈大伟,李忠文,付正一..回归温度对Al-4.5Zn-1.3Mg合金显微组织及力学性能的影响[J].有色金属科学与工程,2025,16(5):726-733,8.基金项目
国家重点研发计划资助项目(2023YFB37100800,2023YFB37100805) （2023YFB37100800,2023YFB37100805）
