作　　者： ; ; ; ; ;

机构地区： 北京工业大学材料科学与工程学院

出　　处： 《材料热处理学报》 2004年第2期15-18,共4页

摘　　要： 采用拉伸力学性能测试、扫描电镜与能谱分析等方法 ,研究了不同量稀土元素Sc对Al 4Cu合金组织与性能的影响。结果表明 :稀土元素Sc能够细化Al 4Cu合金的晶粒组织 ,改善枝晶网胞 ;当Sc含量小于 0 2 %时 ,Al 4Cu合金的抗拉强度σb 和屈服强度σ0 2 提高约 2 0MPa ;当Sc含量为 0 3%～ 0 4 %时 ,抗拉强度σb 和屈服强度σ0 2 有所降低 ;当Sc含量为 0 5 %时 ,抗拉强度σb 和屈服强度σ0 2 又有所升高 ,但低于未添加Sc的Al 4Cu合金 ;Sc对合金的伸长率几乎没有影响。微量Sc元素添加到Al 4Cu合金中 ,当Sc含量小于 0 2 %时 ,基本上以固溶的形式溶入合金基体中 ;当Sc含量为 0 3%～ 0 5 %时 ,除部分固溶于Al基体中外 ,大部分形成起强化作用的Al3Sc相及交互作用AlCuSc相 ,AlCuSc相是Al Cu Sc系合金中的有害相 ,它使合金的力学性能在一定程度上有所降低。 The effects of different content of Sc addition on the microstructure and properties of the Al-4Cu alloy were studied by tensile tests, optical microscope, X-ray diffraction analysis, scanning electron microscope (SEM) and energy spectrum analysis. The experiment results show that rare-earth element Sc is capable of refining the dendrite structure of the Al-4Cu alloy and the strength of the alloy depends on Sc content. The tensile strength σb and yield strength σ0.2 of the alloy increase a little for Sc content lower than 0.2%; and slightly decrease for increasing Sc content to 0.3%-0.4%. σb and σ0.2 of the alloy rise again when the Sc content is 0.5%, though both of them are lower than that of the Al-4Cu alloy without Sc addition. However, no significant influence of Sc addition on the elongation of the Al-4Cu alloy is observed. Adding Sc to the A14Cu alloy, Sc mostly traps into the α-Al solid solution for Sc content lower than 0.2%. However, when the Sc content is at the range of 0.3%-0.5%, only a part of Sc traps into the α-Al solid solution, others form A13Sc, which can strengthen the alloy, and AlCuSc phase, which is harmful to the Al-Cu-Sc alloy.

关 键 词： 微量 元素 合金 显微组织 力学性能

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [金属学及工艺] [金属学及工艺]