固溶处理对含Ag的Al-Cu-Mg合金力学性能和组织的影响  

Effects of Solution Treatment on Mechanical Properties and Microstructure of Al-Cu-Mg Alloy with Ag Addition

作　　者：陆智伦[1] 潘清林[1,2] 陈琴[1] 曹素芳[1] 刘晓艳[1] 何运斌[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《航空材料学报》2011年第6期24-29,共6页Journal of Aeronautical Materials

基　　金：国防科工委军品配套研制项目(JPPT-115-2-948)

摘　　要：采用金相显微镜(OA)、扫描电镜(SEM)、透射电镜(TEM)、差示扫描量热法(DSC)、拉伸测试等方法研究了固溶处理对含Ag的Al-Cu-Mg合金力学性能与组织的影响。结果表明:合金的最佳固溶工艺为:515℃/1.5 h。185℃时效处理4 h后,合金的抗拉强度为503 MPa,伸长率为12.3%。在510～525℃进行固溶处理,随固溶温度升高和固溶时间延长,合金的强度先逐渐升高,当固溶温度超过515℃(保温2 h)或固溶时间大于1.5 h(固溶温度为515℃)时,合金强度逐步降低。固溶温度过低或时间过短不利于过剩相回溶,使合金强度降低,而固溶温度过高或时间过长,则容易过烧。合金的过烧温度为525.9℃。固溶温度对合金的力学性能和显微组织的影响要比固溶时间更加明显。Effect of solution treatment on mechanical properties and microstructure of Al-Cu-Mg alloy with Ag addition was studied by using optical microscopy（OM）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,differential scanning calorimeter（DSC）,and tensile test.Results show that the most suitable solution treatment process of the alloy is solutionizing at 515℃ for 1.5 h.After aging treatment at 185℃ for 4 h,tensile strength and elongation of the alloy are 503 MPa and 12.3%,respectively.The mechanical properties of the alloy increase first with increasing solution temperature and time,then decrease with solution temperature over 515℃（holding time is 2h）or solution time（solution temperature is 515℃） longer than 1.5 h.The lower solution temperature and less solution time result in a less re-solution of excess phases and produce a lower strength of the alloy.However,too high solution temperature and excessive solution time easily lead to over-burn of the specimens.The over-burned temperature of the alloy is demonstrated at 525.9℃.The solution temperature has stronger influence on mechanical properties and microstructure of this alloy than the solution time.

关 键 词：AL-CU-MG-AG合金 固溶 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]