固溶处理对Al-Zn-Cu-Mg-Zr-Ce合金组织性能的影响

Effect of solution treatment on microstructure and properties of Al-Zn-Cu-Mg-Zr-Ce alloy

利用金相显微镜、扫描电镜及拉伸试验机等,研究了固溶处理对Al-7.5Zn-1.5Cu-1.5Mg-0.12Zr-0.1Ce铝合金组织和性能的影响。结果表明,在460~480℃温度范围,保温30~120 min固溶处理工艺下,经470℃×2 h单级固溶处理后,试验合金出现了再结晶,且第二相大部分溶解到基体中,相比其它单级固溶处理工艺,固溶效果最好,时效处理后综合力学性能良好。经450℃×1 h+475℃×1 h双级固溶处理时,因在低温时释放了形变能,再结晶程度低,固溶效果比单级固溶处理效果好,时效处理后合金的综合力学性能更佳。

Effect of solution treatment on microstructure and properties of Al-7.5Zn-1.5Cu-1.5Mg-0.12Zr-0.1Ce aluminum alloy was studied by means of metallographic microscope,scanning electron microscope and tensile testing machine.The results show that under the solution treatment process with temperature range of 460-480℃and holding time of 30-120 min,after single stage solution treatment at 470℃for 2 h,recrystallization occurs and most of the second phase dissolves into the matrix.Compared with other single stage solution treatment,the solution effect is the best,and the comprehensive mechanical properties is good after aging treatment.After 450℃×1 h+475℃×1 h two-stage solution treatment,due to the release of deformation energy at low temperature and low recrystallization degree,the solution effect is better than that of the single stage solution treatment,and the comprehensive mechanical properties of the alloy is better after aging treatment.