Correlation of 3D defect-band morphologies and mechanical properties in high pressure die casting magnesium alloy

被引：29
作者：
Yu, Wenbo [1 ]
Ma, Chaosheng [1 ]
Ma, Yihu [1 ]
Xiong, Shoumei [2 ]
机构：
[1] Beijing Jiaotong Univ, Ctr Mat Sci & Engn, Sch Mech & Elect Control Engn, Beijing 100044, Peoples R China
[2] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2021年 / 288卷
基金：
中国国家自然科学基金;
关键词：
HPDC parameters; Defect band; Porosity; 3D; Tensile fracture; HEAT-TRANSFER BEHAVIOR; POROSITY; DUCTILITY; SLEEVE;
D O I：
10.1016/j.jmatprotec.2020.116853
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
For understanding the processing-microstructure-properties correlation of high pressure die casting (HPDC) AZ91D alloy, 3D reconstruction was carried out to characterize the microstructural morphologies of castings produced by four designed HPDC processes. The influence of different parameters (vacuum, slow-shot speed, fast-shot speed) on porosity volume and morphology, defect band width and average externally solidified crystals (ESCs) size of castings were systematically studied. Microstructural characterization revealed that the defect band width was strongly related with the size and quantity of ESCs, rather than the porosity volume. Meanwhile, ESCs were mainly influenced by the slow-shot speed in shot sleeve (ESCs growth time) and fast-shot speed into the die cavity (shear stress of melt flow). Tensile fracture revealed that cracks easily propagated within the defect bands due to the accumulated ESCs and connected irregular pores, while the cracks were restrained in center zone. The mechanical properties of HPDC castings was inversely proportional to the defect band width, and is not dependent on the average volume fraction porosity.
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页数：9
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