Microstructure and mechanical properties of extruded Mg-6Zn-xEr alloys  

挤压态Mg-6Zn-xEr合金的微观结构和力学性能(英文)

作　　者：刘轲[1] 王庆峰[1] 杜文博[1] 王朝辉[1] 李淑波[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第10期2863-2873,共11页中国有色金属学报（英文版）

基　　金：Project(51071004)supported by the National Natural Science Foundation of China;Project(2011BAE22B01-3)supported by the National Key Technology R&D Program during the 12th Five-Year Period,China

摘　　要：The microstructure and mechanical properties of the Mg-6Zn-xEr alloys in the as-cast, as-extruded and extruded-T5 states were investigated. It is found that the addition of Er has an obvious effect on improving mechanical properties of Mg-6Zn based alloys. The results suggest that the Mg-6Zn-0.5Er alloy in the peak aged state shows the best tensile strength. The ultimate tensile strength and the yield tensile strength of the peak-aged Mg-6Zn-0.5Er alloy are about 329 MPa and 183 MPa, respectively, companying with a good elongation of 12%. The addition of 0.5% Er into the Mg-6Zn based alloys has a great effect on improving ageing hardening response. The highest tensile strength of the peak-aged Mg-6Zn-0.5Er alloy is mainly due to the refinement of microstructure and the precipitation of β1 phase.研究铸态、挤压态和挤压峰值态的Mg-6Zn-xEr合金的微观组织和力学性能。结果表明,Er的加入可显著改善Mg-6Zn合金的力学性能,经过峰值时效后合金的力学性能得到进一步提高;挤压态Mg-6Zn-0.5Er合金经过峰值时效处理后具有最佳的拉伸强度。该合金的抗拉强度和屈服强度分别为329 MPa和183 MPa,伸长率为12%。这表明添加0.5%Er可显著提高Mg-6Zn合金的时效硬化行为。挤压峰值态Mg-6Zn-0.5Er合金较好的力学性能归因于结构的细化和1??相的析出强化。

关 键 词：magnesium alloy Mg-Zn-Er alloy hot extrusion dynamic recrystallization 

分 类 号：TG146.22[一般工业技术—材料科学与工程]