Exceptional mechanical properties of wire arc additive manufactured Mg-9Gd-3Y-0.5Zr alloy induced by promoted precipitation behavior  

作　　者：Junmin Zhan Guohua Wu Xin Tong Fangzhou Qi Qiman Wang Rui Jiang Youjie Guo Zhanyong Zhao Peikang Bai 

机构地区：[1]National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]School of Materials Science and Engineering,North University of China,Taiyuan,030051,China [3]Taiyuan University of Science and Technology,Taiyuan,030602,China

出　　处：《Journal of Magnesium and Alloys》2025年第2期562-570,共9页镁合金学报(英文)

基　　金：supported by the National Natural Science Foundation of China(Nos.U2037601,U2241231,and 51821001).

摘　　要：Additive manufactured Mg-RE alloys usually show exceptional mechanical properties,which is mainly attributed to their refined grains in previous studies.Since Mg-RE series are typical age-hardenable alloys,this study focuses on the aging behavior of wire arc additive manufactured Mg-9Gd-3Y-0.5Zr(GW93K)alloy and compares it with the as-cast counterpart,providing a new insight into the strengthening mechanism of additive manufactured alloys.It was revealed that both the refined equiaxedα-Mg grains and small-sized(only 5~10 nm)β′precipitates with an extremely high number density(~2.53×10^(4)µm^(-2))should be considered for the strengthening mechanisms of the deposited alloy.The promoted precipitation behavior is facilitated by the dislocation pile-ups formed under multiple thermal cycles and a high cooling rate during deposition.As a result,the deposited alloy at peak-aged state exhibits better comprehensive properties of UTS=392 MPa and EL=3.3%,which is 19%and 18%higher than that of the cast sample,individually.

关 键 词：Mg-Gd-Y-Zr alloy Additive manufacturing Precipitation behavior MICROSTRUCTURE Strengthening mechanism 

分 类 号：TG146.22[一般工业技术—材料科学与工程]