固溶处理温度对A356铝合金组织和力学性能的影响  

Effect of Solution Temperatures on Microstructures and Mechanical Properties of A356 Aluminum Alloys

作　　者：宋谋胜[1,2] 龙禹[1,2] 

机构地区：[1]铜仁学院物理与电子科学系,贵州铜仁554300 [2]铜仁学院材料制备新技术与应用贵州省特色重点实验室,贵州铜仁554300

出　　处：《铸造技术》2013年第7期814-817,共4页Foundry Technology

基　　金：贵州省科学技术联合项目(LKT[2012]14);贵州省委组织部科研特助项目(TZJF2010040);贵州省教育厅自然科学重点项目(KY[2012]068);铜仁市科学技术项目(2012-63-8)

摘　　要：在525、535和545℃下对A356合金进行保温3 h的固溶处理,并对固溶处理合金的组织和性能进行研究。结果发现,在3种固溶温度下,Si颗粒均能实现熔断、分离、球化和均匀化,且随固溶温度的升高而不断粗化;合金在535℃固溶能获得最佳形貌的Si颗粒,升高固溶温度并不能改善Si颗粒形貌;固溶温度对合金强度的影响并不明显,而主要影响其塑性,在535℃固溶时合金具有最佳的塑性,从而表现出最佳的综合力学性能。DSC分析表明,合金在535℃固溶保温3 h完全能够溶解铸态时的不稳定强化相Mg2Si粒子。The solution treatment ofA356 alloys was carried out at 525 ℃, 535 ℃ and 545 ℃ for 3 h, and the microstructure and properties of the alloys after solution treatment were studied. The results show that, under the three kinds of solution temperature, Si particles were broken off, separated, spheroidizated and homogenizated, and become coarsening with the increase of solution temperature. The best Si morphologies in the alloys can be obtained at 535 ℃ ×3 h solution treatment, increasing solution temperature failed to improve the Si morphology. The solution temperature has a weak effect on the strength but a significant impact on the plasticity, the alloys exhibits the best plasticity at 535℃ ×3 h, and has the best general mechanical properties. The DSC analysis demonstrates that, at 535 ℃ ×3 h, the metastable strengthing phase Mg2Si particles formed during casting can be re-dissolved into the matrix.

关 键 词：固溶温度 A356 力学性能 DSC 

分 类 号：TG156.94[金属学及工艺—热处理]