固溶时间对Al-Cu-Mg-Ag合金力学性能和晶间腐蚀性能的影响  

Effects of Solution Time on Mechanical Properties and Intergranular Corrosion Resistance of Al-Cu-Mg-Ag Alloy

作　　者：王吉祥 毛盼 柏松[1] 刘志义[1] WANG Jixiang;MAO Pan;BAI Song;LIU Zhiyi(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《矿冶工程》2025年第1期138-142,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金面上项目(52071341);湖南省自然科学基金青年项目(2020JJ5711)。

摘　　要：采用拉伸试验、晶间腐蚀测试、电化学腐蚀分析、透射电子显微镜、扫描电子显微镜和电子背散射衍射技术研究了固溶时间对Al-Cu-Mg-Ag合金力学性能、抗晶间腐蚀性能和微观组织的影响。结果表明,固溶时间从5min增加到120min,残余第二相逐渐溶解,Ω相尺寸和数量逐渐增大,合金力学性能显著提高,但抗晶间腐蚀性能显著降低。晶界无沉淀析出带(PFZ)与基体的电位差是增大晶间腐蚀速率的决定性因素,而PFZ宽度对抗晶间腐蚀性能无明显影响。The effects of different solid solution time on the mechanical properties,intergranular corrosion(IGC)and microstructure of an Al-Cu-Mg-Ag alloy were investigated by performing tensile testing,IGC tests,and electrochemical corrosion analysis,as well as using transmission electron microscopy,scanning electron microscopy and electron backscatter diffraction techniques.Results show that increasing the solution time from 5 min to 120 min leads to a gradual dissolution of residual second phase and a gradual increase in the size and quantity ofΩphase,contributing to a remarkable improvement in mechanical properties.Meanwhile,the IGC resistance of Al-Cu-Mg-Ag alloy is found to be considerably degraded as solution time is prolonged.The potential difference between the precipitation free zone(PFZ)and the matrix is the decisive factor in accelerating the IGC rate,while the PFZ width has no obvious influence on IGC resistance.

关 键 词：AL-CU-MG-AG合金 固溶处理 Ω相 无沉淀析出带 晶间腐蚀 残余第二相 

分 类 号：TG156[金属学及工艺—热处理]