The effect of different high pressure die casting parameters on 3D microstructure and mechanical properties of AE44 magnesium alloy  

作　　者：Tong-tong Zhang Wen-bo Yu Chao-sheng Ma Wan-tong Chen Lin Zhang Shou-mei Xiong 

机构地区：[1]Center of Materials Science and Engineering,School of Mechanical and Electronic Control Engineering,Beijing Jiaotong University,Beijing 100044,China [2]China Academy of Machinery Science and Technology Group Co.,Ltd,Beijing 100044,China [3]School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Magnesium and Alloys》2023年第9期3141-3150,共10页镁合金学报（英文）

基　　金：financially supported by the Fundamental Research Funds for the Central Universities (M22JBMC0060);the National Natural Science Foundation of China (No.52175284);the State Key Lab of Advanced Metals and Materials (No.2021-ZD08)。

摘　　要：To understand the relationship between the process-microstructure-mechanical properties of the high-pressure die-casting(HPDC) AE44 magnesium alloy, 3D reconstruction and 2D characterization were carried out on the HPDC castings produced with different process parameters(low slow-shot speed, fast slow-shot speed, solidification pressure). Microstructural characterization revealed that the formation of shrinkage pores are closely related to ESCs, which were mainly controlled by the low slow-shot speed in shot sleeve(ESCs growth time) and fast slow-shot speed into the die cavity(distribution of ESCs). In addition, solidification pressure can significantly reduce the shrinkage porosity in the center by improving the feeding capacity of liquid metal. Tensile fracture revealed that the tearing ridge is mainly evolved from the slip band of ESCs. The quantity and distribution of ESCs determine the fracture mode of castings. The relationship between mechanical properties of castings and the morphology of ESCs and porosity is also statistically discussed.

关 键 词：HPDC parameters POROSITY Externally solidified crystals(ESCs) Tensile fracture 3D reconstruction 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG249.2[金属学及工艺—金属材料]