微量钪对Al-3%Cu合金组织与性能的影响  

Effects of Trace Sc on Structures and Properties of Al-3%Cu Alloy

作　　者：徐国富[1] 聂祚仁[2] 金头男[2] 荣莉[2] 阮海琼[2] 尹志民[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]北京工业大学材料科学与工程学院,北京100022

出　　处：《金属热处理》2004年第3期24-27,共4页Heat Treatment of Metals

基　　金：国家重点基础研究发展规划项目 (G19990 64 90 7)

摘　　要：采用硬度、拉伸性能测试、金相组织观察、扫描电镜与能谱分析以及X 射线衍射等方法 ,研究了微量稀土元素Sc对Al 3%Cu合金组织与性能的影响。结果表明 ,稀土元素Sc能够强烈地细化Al Cu合金的晶粒 ,改善枝晶网胞。微量Sc元素添加到Al 3%Cu合金中 ,合金的抗拉强度σb 和屈服强度σ0 2 均有所提高 (Δσ约为 30MPa) ,对合金的伸长率几乎没有影响 ;微量Sc元素添加到Al 3%Cu合金中 ,除部分固溶于Al基体中外 ,大部分与Al形成对合金起强化作用的Al3Sc共格相 ,对合金起强化作用 ,没有发现其他相 ,包括W (AlCuSc)相生成。The effects of different content of Sc addition on the microstructure and properties of the Al-3%Cu alloy have been studied by hardness and tensile properties measurement,optical microscope,X-ray diffraction analysis,scanning electron microscope(SEM) and energy spectrum analysis.The experimental results show that the addition of rare-earth element Sc can refinie the dendrite structure of the Al-3%Cu alloy,and enhance the tensile strength σ_b and yield strength σ_(0.2)(Δσ is about 30MPa),but has almost no influence on the elongation of the Al-3%Cu alloy.Most of the doping Sc form Al_3Sc which can strengthen the alloy,except a little part of Sc which was solubilized into the α-Al solid solution and there is no more other phase forming such as W(AlCuSc).

关 键 词：微量钪 Al-3%Cu合金 组织与性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]