Microstructure and mechanical properties of TiC nanoparticles reinforced 7075 aluminium alloy fabricated by oscillating laser-arc hybrid additive manufacturing
Bingchen Li, Xi Chen, Meng Jiang, Shengchong Ma, Zhiyuan Wang, Zhenglong Lei, Yanbin Chen
Abstract
In this work, TiC nanoparticles (TiC ps ) reinforced 7075 aluminium alloy was fabricated via an oscillating laser-arc hybrid additive manufacturing process. To show the beneficial effect of TiC ps addition on microstructure and mechanical properties, a conventional 7075 aluminium alloy was also manufactured for comparison. Upon the addition of TiC ps , remarkable grain refinement was achieved with a decrease in average grain size from 111.8 to 12.5 µm, and grain boundary segregation was alleviated. It was also found that many secondary phases precipitated at the grain interior in the deposit with TiC ps . Owing to the refined microstructure and favourable precipitation, as-deposited 7075 aluminium alloy with TiC ps showed enhanced tensile properties of ultimate tensile strengths of 346 and 355 MPa along scanning and build directions.