稀土元素Y对Mg-Al-Zn合金组织及电磁屏蔽性能的影响  

Influence of Yttrium on Microstructure and Electromagnetic Shielding Performance of Mg-Al-Zn Alloy

作　　者：董晟全[1] 高丰[1] 梁艳峰[1] 何子博[1] 

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021

出　　处：《铸造技术》2016年第5期867-871,共5页Foundry Technology

摘　　要：采用普通铸造法制备不同Y含量的电控箱体用Mg-Al-Zn合金,借助于光学显微镜、X射线衍射仪(XRD)、以及法兰同轴测试仪等仪器,观察了合金的显微组织,测试了力学性能和电磁屏蔽性能。结果表明,添加Y后,镁合金中形成了Al_2Y化合物,第二相由较为粗大的枝晶状变成弥散分布的块状和颗粒状;当Y的添加量为0.7%时,组织细化效果好,性能也较优,硬度为53.08 HB,抗拉强度达220 MPa,伸长率最高达9.7%,电导率达到15.7%IACS。A series of Mg-Al-Zn alloys with various Y contents used as electric-controlling box were made by common casting method. The microstructure of the alloys was observed by optical microscopy and X-ray diffraction（XRD）. The tensile and electromagnetic shielding performances were tested by extensograph and coaxial flange tester. The results show that the morphology of second phase changes from coarse dendrite to bulk and granular shaped after the addition of Y and Al_2Y compound forms. When adding 0.7%Y, the alloy can achieve the best refinement and have the best performance, i.e.the hardness of 53.08 HB, UTS of 220 MPa, the maximum elongation of 9.7%, and the conductivity of 15.7% IACS.

关 键 词：Mg-Al-Zn合金 稀土元素Y 微观组织 电磁屏蔽性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]