固溶温度对2A50铝合金组织与性能的影响  

Effect of solution temperature on microstructure and properties of 2A50 aluminum alloy

作　　者：蔡红 岳忠 项红岩 彭卫刚 张敏 冀澎 CAI Hong;YUE Zhong;XIANG Hong-yan;PENG Wei-gang;ZHANG Min;JI Peng(Inner Mongolia First Machinery Group Co.,Ltd.Baotou 014032,China)

机构地区：[1]内蒙古第一机械集团股份有限公司,内蒙古包头014032

出　　处：《轻合金加工技术》2020年第10期51-55,60,共6页Light Alloy Fabrication Technology

摘　　要：试验研究了不同固溶温度下的2A50铝合金的微观组织、力学性能和疲劳性能,采用SEM电镜观察拉伸试样的断口形貌。研究结果表明:当固溶温度为525℃±1.5℃(保温30 min)时,2A50铝合金的力学性能达到峰值;随着固溶温度的继续上升,其力学性能和疲劳寿命Nf等指标显著下降。随着疲劳周次的增加,2A50铝合金的旋转弯曲疲劳极限强度为154 N/mm^2,疲劳裂纹萌生于材料表面,扩展区存在典型的准解理形貌,终端区断裂特征为解理断裂。The microstructure,mechanical properties and fatigue properties of 2 A50 aluminum alloy were tested at different solution temperatures.The fracture morphology of the tensile sample was observed by SEM.The results show that comprehensive mechanical properties can reach the peak value when the solution temperature of 2 A50 aluminum alloy is525 ℃ ± 1.5 ℃( holding for 30 min).With the increase of solution temperature,the mechanical properties and fatigue life Nf of 2 A50 aluminum alloy decrease significantly.With the increase of fatigue cycles,the rotary bending fatigue ultimate strength of 2 A50 aluminum alloy is 154 N/mm^2.The fatigue cracks result from the surface of the material.The typical quasi cleavage morphology exists in the propagation region.The fracture feature is cleavage fracture in the terminal region.

关 键 词：2A50铝合金 固溶温度 显微组织 疲劳性能 

分 类 号：TG166.3[金属学及工艺—热处理]