稀土Sc、Zr对铸造Zn-43Al-1.6Cu合金组织及力学性能的影响  

Effects of Rare Earth Scandium and Zirconium on Microstructure and Mechanical Properties of As-Cast Zn-43Al-1.6Cu Alloy

作　　者：向青春[1] 赵静[1] 白彦华[1] 黄宏军[1] 李荣德[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《铸造》2011年第12期1229-1232,共4页Foundry

基　　金：辽宁省自然科学基金项目(20072043)

摘　　要：通过力学性能测试、X射线衍射、扫描电镜及能谱分析等手段,研究了复合添加稀土元素Sc、Zr对Zn-43Al-1.6Cu合金铸态显微组织及力学性能的影响。研究发现:在铸态Zn-43Al-1.6Cu合金中复合添加0.4%Sc、0.1%Zr时,合金显微组织细化效果较好,粗大的树枝晶转变为均匀、细小的团絮状组织,合金的抗拉强度达到372.3 MPa,伸长率提高了45.1%;稀土元素Sc、Zr与Zn-43Al-1.6Cu合金中的Al形成了与α-Al基体晶格类型和晶胞尺寸都极为相近的复杂化合物Al3Sc粒子,促进异质形核,起到细晶强化的作用,从而提高了合金的力学性能。By means of the tensile test, X-ray diffraction, scanning electron microscope and energy spectrum analysis, the effects of rare earth Sc, Zr on the as-cast microstructure and mechanical properties of Zn-43Al-1.6Cu alloy were investigated. It has been experimentally observed that when 0.4% Sc and 0.1% Zr are complexly added in the alloy, the refinement result of the microstructure of the alloy is comparatively better, and the coarse dendrites are refined and transformed into the uniform and small floccus microstructure. The tensile strength of the alloy is up to 372.3 MPa, and the elongation is increased by 41.7%. In the Zn-43Al-1.6Cu alloy, the rare earth Sc, Zr forms the complex compound-AI3Sc particles with Al, whose lattice （Ll2-type） and the crystal cell size are extremely similar to the α-Al matrix. So these particles may enhance the heterogeneous nucleation, refine the microstructure of the alloy and improve the properties of the alloy.

关 键 词：Zn-43Al-1.6Cu合金 SC ZR 细晶强化 Al3Sc粒子 异质形核 显微组织 力学性能 

分 类 号：TG146.13[一般工业技术—材料科学与工程]