This study investigates a new powder surface functionalization approach to promote in-situ TiB2 formation during Laser Powder Bed Fusion of an Al-Ti-Mg alloy. The powder surface was decorated with 0.5wt.% boron nanoparticles through a fluidized-bed process, eliminating the need for ex-situ TiB2 additions. EBSD results showed that while Al3Ti alone was insufficient to completely suppress epitaxial grain growth, the coexistence of TiB2 and Al3Ti promoted the formation of a fully equiaxed microstructure, leading to a marked improvement in both yield and ultimate tensile strength. TEM analysis confirmed the presence of in-situ formed TiB2 particles in the as-built samples. After T6 heat-treatment, the two alloys exhibited distinct differences in Al3Ti precipitation behaviour. TEM analysis showed that the boron-free alloy contained a homogeneous distribution of rod-like Al3Ti precipitates, whereas the functionalized powder had a lower density of coarser Al3Ti particles. Additionally, both alloys exhibited Mg2Si precipitates, which appear as polyhedral or cubic
The surface chemistry of additively manufactured aluminum alloys plays a critical role in corrosion resistance and joining with external materials. In this work, the near-surface elemental composition of a laser powder bed fusion (PBF-LB/M) processed Al-Mg-Si-Zr alloy was characterized by glow discharge optical emissio...
Zheng-Qing Wei, Philip Grimm, Inna Plyushchay et al.· 0 citations
Additive manufacturing (AM) of aluminum alloys has been widely employed in aerospace, automotive, and other high-performance engineering applications. Nevertheless, aluminum-lithium (Al-Li) alloys processed via laser powder bed fusion (LPBF) are susceptible to solidification cracking and often exhibit suboptimal mechan...
Ren-Ke Wang, Kai-Jie Lin, Hao-Dong Tian et al.· Materials Science in Additiv...· 0 citations
The limited thermal stability of conventional aluminium alloys at elevated temperatures restricts their application in laser powder bed fusion (LPBF). In this study, a novel Al6Ca3Cu1.8Mn0.4Zr (wt.%) alloy was developed for improved thermal stability via stable intermetallic phases. LPBF processing of gas-atomised powd...
S. Cherkasov, N. Letyagin, P. A. Palkin et al.· Journal of Manufacturing and...· 0 citations
Additive manufacturing of high strength 6xxx series aluminium alloys by powder bed fusion - laser beam (PBF-LB) is limited by hot cracking, driven by their wide solidification range and rapid cooling rates. Nanoparticle additions have shown success to mitigate cracking through grain refinement, but their adoption is re...
K. Zhang, A. Elashery, K. Marthinsen· IOP Conference Series: Mater...· 0 citations
Aluminum-silicon (Al-Si) alloys are staple materials in the automotive and aerospace industries. However, effective grain refinement of alloys containing > 4 wt.% Si remains challenging with traditional Al-Ti-B master alloys. This difficulty arises from the silicon poisoning effect, in which Si reacts with titanium to...
Joéverton Iurk Pereira, Artur Fernando Martins Schardong, Julia Rezende Leonardo et al.· JOM· 0 citations
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