Tailoring the microstructural characteristics and enhancing creep properties of as-cast Mg-5Bi-5Sn alloy through Mn addition  

作　　者：Yi-hao Luo Wei-li Cheng Hui Yu Hong-xia Wang Xiao-feng Niu Li-fei Wang Hang Li Zhi-yong You Hua Hou 

机构地区：[1]School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China [3]School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300132,China [4]School of Materials Science and Engineering,North University of China,Taiyuan 030051,China

出　　处：《Journal of Magnesium and Alloys》2023年第9期3350-3361,共12页镁合金学报（英文）

基　　金：jointly supported by the National Natural Science Foundation of China (Grant Nos: 51704209,51701060,51901153);Natural Science Foundation of Shanxi province (Nos: 201801D121088,201901D211096);the Science and Technology Major Project of Shanxi province (Nos: 20191102007,20191102008)。

摘　　要：The creep properties, microstructural characteristics and creep mechanisms of as-cast Mg-5Bi-5Sn(BT55) alloy without and with Mn(BTM550) addition were investigated via creep at 423, 448, and 473 K as well as stresses of 30, 50 and 75 MPa. The results indicate that adding Mn can result in the formation of primary and the dynamic precipitated α-Mn phases. In addition, the morphology of the precipitated Mg_(3)Bi_(2) phase and the orientation relationship between Mg_(2)Sn precipitates and α-Mg can be effectively modified. Tailoring the microstructural characteristics is responsible for the improved creep performance of BTM550 alloy. The dominant creep mechanisms in BT55 and BTM550 alloys are dislocation cross-slip and climb, respectively. Furthermore, twinning and pyramidal slip play an assisting part in both alloys during creep process.

关 键 词：Mg alloy Microstructural characteristics Creep properties PRECIPITATES DISLOCATION 

分 类 号：TG146.22[一般工业技术—材料科学与工程]