Sub-micron particles induced microstructure modification to achieve exceptional mechanical and corrosion properties combination in additive manufactured TiB2/Al–Zn–Mg–Cu composites

作者：Gaoqiu Sun, Lixiong Shao, Zhiping Wang, Yating Li, Yaqi Deng, Ping Zhang, Guoping Zhao, Xianfeng Li, Haowei Wang · 发表于：Advanced Composites and Hybrid Materials · 年份：2025 · DOI：10.1007/s42114-025-01398-8 · 被引用次数：12 · 研究领域：Aluminum Alloys Composites Properties、Additive Manufacturing Materials and Processes、Microstructure and mechanical properties

The aluminum alloys processed by additive friction stir deposition (AFSD) typically exhibit dense microstructures with fine grains. However, these fine grains are prone to coarsen during subsequent heat treatment, limiting the application of AFSDed materials. In this study, sub-micron TiB 2 particles with different contents (3.5 wt.% and 8 wt.%) were introduced to modify the microstructure and tailor the mechanical/corrosion properties of Al–Zn–Mg–Cu alloys. Compared with the typical 7055 aluminum alloy, the TiB 2 particles led to great grain refinement by promotion of recrystallization and significantly enhanced the thermal stability of two TiB 2 /7055 composites during heat treatment. Meanwhile, the particles could alter the precipitation behavior during aging treatment, resulting in the formation of interface precipitates, a discontinuous distribution of grain boundary precipitates, and a narrower precipitate-free zone. An exceptional combination of mechanical and corrosion properties was achieved by particle addition, where 3.5 wt.% particle addition could enhance both strength and ductility of alloy, with a reduction in intergranular corrosion resistance, and 8 wt.% particle addition would enhance the strength and intergranular corrosion resistance, with a slight decrease in ductility. According to microstructure characterization, the underlying mechanism regarding the effects of sub-micron TiB 2 particles on grain structure and its thermal stability was deeply revealed....