Enhanced high-temperature mechanical properties of laser-arc hybrid additive manufacturing of Al-Zn-Mg-Cu alloy via microstructure control

Dehua Liu,Dongjiang Wu, Yunsong Wang,Zhuo Chen, Changrong Ge, Qingyu Zhao,Fangyong Niu,Guangyi Ma

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY(2024)

引用 1|浏览8
暂无评分
摘要
Recently, rapid and cost-effective additive manufacturing solutions for lightweight aluminum alloys with excellent high-temperature mechanical properties have been increasingly in demand. In this study, we combined laser-arc hybrid additive manufacturing with solution and artificial aging treatments to achieve Al-Zn-Mg-Cu alloy with favorable high-temperature strength via microstructure control. Hydrogen pores became the major defect in the as-deposited and heat-treated specimens. The continuous distribution of eutectics with hard-brittle characteristics at the grain boundaries was destructed following heat treat-ment. High-density & eta;' precipitates were uniformly dispersed in the heat-treated Al-Zn-Mg-Cu alloy, whereas appeared coarsened and dissolved at 473 K, owing to the rapid diffusion of Zn and Mg. The average 0.2% yield strength (318 & PLUSMN; 16 MPa) and ultimate tensile strength (362 & PLUSMN; 20 MPa) at 473 K af -ter heat treatment were enhanced by approximately 58% and 51%, respectively, compared to those of the as-deposited specimen. In addition, the & eta;' precipitates contributed to lattice distortions and strain fields, which prevented dislocation motion and increased slip deformation resistance at high temper-atures. The as-deposited specimen exhibited intergranular fracture at 473 K, with cracks preferring to propagate along the aggregated eutectics. However, crack propagation proceeded in the sections with more pores in the heat-treated specimen. Our approach may provide a valid option for achieving alu-minum alloys with excellent high-temperature mechanical properties.& COPY; 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
更多
查看译文
关键词
Laser-arc hybrid additive manufacturing,Al-Zn-Mg-Cu alloy,High-temperature strength,Heat treatment Microstructure evolution
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要