Effect of lithium anti-ablation and grain refinement introduced by TiC nanoparticles in LPBF Al–Li alloy

• DOI: 10.1016/j.jmrt.2023.10.145
• Publication Date: 2023-10-19T09:04:10Z
• Authors: Jin'e Sun; Yaojie Wen; Zhong Wang; Jingguo Zhang; Linshan Wang; Xuanhui Qu; Baicheng Zhang
• Keywords: Equiaxed crystals

Al-Li alloys are extensively utilized in the field of aerospace due to their low density and high specific strength. However, laser powder bed fusion (LPBF) processed still encounter challenges because hot cracking Li element ablation. In this study, a TiC nanoparticle modified Al-Mg-Li alloy is developed for LPBF process. Full dense printed can be obtained. The presence nanoparticles melt pool effectively increased viscosity Al liquid, leading reduction metal vaporization liquid spatters, thus preventing ablation during LBPF. content was significantly from 0.87 wt.% 1.34 % alloy. Moreover, played key role transition columnar equiaxed grain. average grain size refined about 1.5 μm, two orders magnitude smaller than that A gradient reaction Al3Ti found on surface LPBF. in-situ formed phase decreased lattice mismatch with matrix, thereby resulting an outstanding mechanical property ultimate tensile strength 343 MPa elongation 9.3 %. effect anti-ablation induced by provided new pathway additive manufacturing light-weight