The Ductility Variation of High-Pressure Die-Cast AE44 Alloy: The Role of Inhomogeneous Microstructure

被引：15

作者：

Xia, Yatong ^{[1
]}

Zheng, Jiang ^{[1
]}

Chen, Juan ^{[2
]}

Zhang, Yongfa ^{[1
]}

Shi, Rong ^{[1
]}

Zhou, Hao ^{[3
]}

Zhou, Zheng ^{[1
]}

Yin, Dongdi ^{[4
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys, Minist Educ, Chongqing 400044, Peoples R China

[2] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Sch Mat Sci, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China

[3] Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Nanjing, Peoples R China

[4] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Sichuan, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2021年 / 52卷 / 06期

基金：

中国国家自然科学基金;

关键词：

47;

D O I：

10.1007/s11661-021-06220-w

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the study, the through-thickness microstructure and its effects on the ductility and strain heterogeneity in high-pressure die-cast AE44 alloy were investigated. The results show that the studied alloy had a gradient microstructure, where two fine-grained skins sandwiched a core with coarse externally solidified crystals (ESCs) embedded in fine grains. In the core, where porosity concentrated, the ultra-coarse ESCs with sizes up to 600 mu m were observed. A great amount of Al11RE3 phase, as the predominant intermetallic phase, was distributed in homogeneously through the thickness. High-resolution digital image correlation (DIC) measurement coupled with electron backscatter diffraction (EBSD) was employed to reveal the deformation inhomogeneity and its root cause. It was found that considerable strain localization mainly appeared in the ultra-coarse ESCs with soft orientation for basal slip and the regions where porosity appeared. Unlike the yield strengths and ultimate tensile strengths, the elongations showed a significant variation. Not only defects but also the ultra-coarse ESCs were the primary factors responsible for the variation in ductility.

引用

页码：2274 / 2286

页数：13