摘要
为提高轨道交通用Al-Zn-Mg合金的拉伸力学性能和耐蚀性,对Al-Zn-Mg合金的化学成分进行优化,通过金相显微镜、扫描和透射电子显微镜分析及室温拉伸、剥落腐蚀和慢应变速率拉伸试验对合金挤压型材的组织和性能进行评估。结果表明:Zn、Mg元素的协同匹配对拉伸力学性能的优化至关重要,微量Cu元素可以改善合金的抗应力腐蚀性能,微量Zr元素可以有效抑制合金的再结晶,提高强度和抗应力腐蚀性能。经过成分优化,遴选出兼具优异的拉伸力学性能和耐蚀性的合金,其合金成分为Al-5.81Zn-0.82Mg-0.12Cu-0.16Zr。
In order to improve the tensile mechanical properties and corrosion resistance of Al-Zn-Mg alloy for rail transit industry,the chemical composition of the alloy is optimized,the structure and properties of the in-service Al-Zn-Mg alloy extrusion are evaluated by the aid of metalloscope,scanning and transmission electron microscope,as well as tensile test at room temperature,exfoliation cor⁃rosion and tensile test at slow strain rate.The results show that the synergistic matching of Zn and Mg elements is very important for the optimization of tensile mechanical properties;the trace Cu element can improve the stress corrosion performance of the alloy,and the trace Zr element can effectively restrain the recrystallization of the alloy,thus improving the strength and stress corrosion resistance.The alloy with excellent tensile mechanical properties and corrosion resistance is selected after the composition optimization,and its alloy composition features Al-5.81Zn-0.82Mg-0.12Cu-0.16Zr.
作者
黎华珍
潘柏清
丁浩
刘雄
王向东
LI Huazhen;PAN Baiqing;DING Hao;LIU Xiong;WANG Xiangdong(CRRC Zhuzhou Institute Co.,Ltd.,Zhuzhou,Hunan 412001,China)
出处
《轨道交通材料》
2025年第1期36-41,共6页
Materials for Rail Transportation System
关键词
AL-ZN-MG合金
成分优化
拉伸力学性能
剥落腐蚀
应力腐蚀
Al-Zn-Mg alloy
composition optimization
tensile mechanical property
exfoliation corrosion
stress corrosion
作者简介
第一作者:黎华珍(1986-),男,本科,工程师,从事工艺管理、机械加工装配、金属材料研究。
