Effects of Ti addition on the microstructure and mechanical properties of Mg-Zn-Zr-Ca alloys

作     者：Jingai Chen Yan Sun Jinshan Zhang Weili Cheng Xiaofeng Niu Chunxiang Xu 

作者机构：College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2015年第3卷第2期

页      面：121-126页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors acknowledge the financial support from the National Science Foundation of China through Grant No.50571073 Natural Science Foundation of Shanxi Province through Grant No.2009011028-3 

主　　题：Ti Magnesium alloys Microstructure Mechanical properties Heat treatment 

摘      要：The effects of Ti additions(0,0.4,0.6,0.8,1.0,1.2 wt.%)on the microstructure and mechanical properties of as-cast and aging Mg-0.4%Zn-1.0%Zr-1.5%Ca(wt.%)alloys were *** results indicated that minor Ti can effectively refine grains,while excessive Ti addition resulted in the grain *** the content of Ti was 0.8 wt.%,the as-cast alloy exhibited the finest grain size of 39μm which contributed to the optimal mechanical properties with Brinell hardness of 57.9 HB,ultimate tensile strength of 145 MPa and elongation of 3.2%.After T6 heat treatment,the continuous net-like Mg_(2)Ca and Mg_(6)Zn_(3)Ca_(2)phases changed to uniform massive T phases(ternary Mg-Zn-Ca phases)and dispersive halo-like precipitates(Mg_(2)Ca and Mg_(6)Zn_(3)Ca_(2)phases).The ultimate tensile strengths of the alloy at room temperature(RT),175℃and 200℃were correspondingly improved to 182 MPa,169 MPa and 141 MPa,respectively.