微量钇、铒对2519合金组织性能的影响  

Effects of Yttrium and Erbium on Microstructure and Mechanical Properties of 2519 Aluminum Alloy

作　　者：李杨勇[1] 王金惠[1] 刘莹颖[1] 夏长清[1] 孙振起[1] 

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》2008年第1期75-77,共3页Mining and Metallurgical Engineering

基　　金：国家重点基础研究发展规划项目(2005CB623706)

摘　　要：用光学显微镜、扫描电镜、X射线衍射分析、拉伸实验等研究了钇、铒对2519铝合金组织及力学性能的影响。结果表明,在2519铝合金中分别加入质量分数为0.1%的钇、质量分数为0.2%的铒后,合金的强度、延伸率提高,合金的铸态组织及再结晶晶粒细化。当钇含量为0.1%,铒含量为0.4%时,合金的强度、延伸率下降。含0.1%Y、0.2%Er的2519合金的相组成为α(Al)+Al2Cu+Al6Cu6Y;而含0.1%、0.4%Er的2519合金的相组成为α(Al)+Al2Cu+Al6Cu6Y+Al8Cu4Er。Effects of yttrium and erbium on the microstructure and the mechanical properties of the 2519 aluminum alloy were investigated by means of optical microscope, SEM, X-ray and tensile test. The experimental results show that adding 0.1 wt % yttrium and 0.2 wt % erbium to the alloy could obviously improve the strength and elongation of the alloy and fine the cast organizations and recrystallization microstructure of the alloy. When the.contents of yttrium and erbium were 0.1% and 0.4% respectively, the strength and elongation of the alloy declined gradually. The phases of 2519 Aluminum Alloy with 0. 1wt% yttrium and 0.2 wt % erbium were or（Al） ＋ Al2Cu ＋ Al6Cu6Y, with 0. 1wt% yttrium and 0.4 wt % erbium, α（Al） ＋ Al2Cu ＋ Al6Cu6Y ＋ Al8Cu4Er.

关 键 词：时效硬化 2519合金 钇 铒 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] TG146.45[金属学及工艺—金属材料]