Achieving excellent strength of the LPBF additively manufactured Al-Cu-Mg composite via in-situ mixing TiB2 and solution treatment
-
作者
Sun, Tengteng; Chen, Jian; Wu, Yi; Wang, Mingliang; Fu, Yanan; Wang, Hongze; Wang, Haowei
-
刊物名称
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
-
年、卷、文献号
2022, 850, 0921-5093
-
关键词
Sun, Tengteng; Chen, Jian; Wu, Yi; Wang, Mingliang; Fu, Yanan; Wang, Hongze; Wang, Haowei
-
摘要
Additively manufactured (AMed) structure with superior strength is urgently required in Al alloy engineered products. Here, we reported a laser powder bed fusion (LPBF) AMed Al-Cu-Mg composite with excellent strength obtained by in-situ mixing TiB2 and post-build heat treatment (PHT). The as-printed samples presented the bimodal structure with a refined grain size of-4.63 mu m. The solution-treated sample exhibited an excellent combination of strength and ductility (tensile strength-520.3 MPa, uniform elongation-9%), which were 133%, 136% of the as-printed sample, respectively. Such tensile strength was the highest among all reported LPBFed 2024Al alloy/composites. In detail, the high strength can be attributed to grain boundary strengthening caused by the refined equiaxed-columnar bimodal structure, solution strengthening caused by the dissolved elements, load-bearing strengthening and Orowan-strengthening caused by TiB2 particles. Therefore, this manuscript should suggest a strategy for developing AMed high-strength aluminum composite via in-situ mixing of particles and PHT.
