Effect of lanthanum oxide on microstructure and mechanical properties of ZK60 magnesium alloy  

作　　者：Wei Qiu Zhaoyuan Lu Senmao Zhang Shuanglong Li Jian Chen Wei Chen Wei Li Yanjie Ren Jun Luo Maohai Yao Wen Xie 

机构地区：[1]School of Energy and Power Engineering,Changsha University of Science&Technology,Changsha,410114,China [2]Key Laboratory of Energy Efficiency and Clean Utilization,The Education Department of Hunan Province,Changsha University of Science&Technology,Changsha,410114,China [3]School of Mechanical&Energy Engineering,Zhejiang University of Science&Technology,Hangzhou,310023,China [4]Hunan Provincial Key Laboratory of Vehicle Power and Transmission System,Hunan Institute of Engineering,Xiangtan,411104,China [5]Hunan Rare Earth Metal Material Research Institute,Institute of Rare Earth Light Alloys,Changsha,410126,China

出　　处：《Journal of Rare Earths》2024年第12期2270-2278,I0003,共10页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(52171099,51301025,51140001);the Education Department of Hunan Province of China(22A0240)。

摘　　要：Different amounts of La_(2)O_(3)were added to ZK60 alloy to observe the changes in microstructure and mechanical properties of ZK60-XLa_(2)O_(3)(X=0,0.2 wt%,0.5 wt%)composites.Our findings reveal that within the as-cast ZK60 alloy,the Mg-Zn binary phase is manifested as rod-shaped precipitates,exhibiting a dispersed distribution predominantly along the grain boundary regions.With the increase of La_(2)O_(3)addition,the rod-like Mg-Zn binary phases are gradually replaced by Mg-Zn-La ternary phases,and these Mg-Zn-La ternary phases are semi-continuously distributed around the grain boundaries.Both ZK602 and ZK605 alloys result in a corresponding improvement in ductility after extrusion.It is noteworthy that the ductility of the as-extruded ZK605 alloy is increased by 59.4%compared to ZK60 at the expense of a reduction of only 3.9%in yield strength.Taken together,the significant increase in ductility of ZK605 is mainly due to the weakening of the basal texture,which is weakened by the redox reaction of La_(2)O_(3)with the a-Mg matrix,generating the La element.The decrease in yield strength of ZK605 in the extruded state is closely related to the observed grain coarsening phenomenon and the basal texture weakening.At the same time,the ultimate tensile strength of ZK605 shows a slight increase,which is mainly due to the second phase strengthening.The Mg-Zn-La ternary phase exhibits a notably hard character,and it is evident that the distribution of this phase becomes progressively denser as the La_(2)O_(3)content increases.

关 键 词：ZK60 La_(2)O_(3) MICROSTRUCTURE Mechanical properties Basal texture Rare earths 

分 类 号：TG146.22[一般工业技术—材料科学与工程]