Effect of Mg-based spherical quasicrystal on microstructures and mechanical properties of ZA54 alloy

作     者：张金山 张永青 张焱 许春香 王晓明 严杰 

作者机构：College of Materials Science and EngineeringTaiyuan University of Technology CSR Qishuyan Locomotive and Rolling Stock Technology Research Institute Co.Ltd. 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2010年第20卷第7期

页      面：1199-1204页

核心收录：

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：Project(50571073) supported by the National Natural Science Foundation of China Projects(2009011028-3,2007011067,20051052)supported by the Natural Science Foundation of Shanxi Province,China 

主　　题：magnesium alloy spherical quasicrystal particles ZA54 alloy composite strengthening heat-resistance ~: magnesium alloy spherical quasicrystal particles ZA54 alloy composite strengthening heat-resistance 

摘      要：To improve the strength, toughness and heat-resistance of magnesium alloy, the microstrucmre and mechanical properties of ZA54 alloy reinforced by icosahedral quasicrystal phase （/-phase） particles were studied. Except α-Mg, φ-phase and τ-phase, MgZnYMn I-phase particles can be obtained in ZA54-based composites by the addition of icosahedral quasicrystal-contained Mg-Zn-Y-Mn master alloy. The introduction of MgZnYMn I-phase into ZA54 alloy has great contribution to the refinement of matrix microstructures and the improvement of mechanical properties. When the addition of Mg-based spherical quasicrystal master alloy is up to 3.5% （mass fraction）, the macro-hardness of ZA54-based composites is increased to HB 68. The impact toughness of composites reaches the peak value of 18.3 J/cm^2, which is about 29% higher than that of ZA54 mother alloy. The highest tensile properties at ambient and elevated temperatures with master alloy addition of 2.5% （473 K） are also obtained in ZA54-based composites with 3.5% （mass fraction） Mg-Zn-Y-Mn master alloy addition. The ultimate tensile strength of composites at ambient and elevated temperatures are 192.5 MPa and 174 MPa, which are 23.4% and 33.8% higher than that of ZA54 mother alloy, respectively. The improved mechanical properties are mainly attributed to the pinning effect of I-phase on grain boundaries.