Icosahedral quasicrystal-enhanced nucleation in Al alloys fabricated by selective laser melting
نویسندگان
چکیده
Selective laser melting (SLM) is rapidly evolving to become a mainstream technology. However, the fundamental mechanisms of solidification and microstructure development inherent non-equilibrium conditions this additive manufacturing method, which differ largely from those typical conventional processing techniques, remain widely unknown. In work, an in-depth characterization Al7075 SLM processed samples, built powder mixtures containing ZrH2 microparticles, demonstrates occurrence icosahedral quasicrystal-enhanced nucleation during fabrication. This mechanism, only observed date in cast Al-Zn yellow gold alloys minute additions Cr (Kurtuldu et al., 2013) or Ti (Chen al. 2018), Ir 2014), evidenced by presence abnormally high fraction twin boundaries five-fold orientation symmetry between twinned nearest neighbors lying within matrix equiaxed, randomly textured, ultrafine grains. research attests wide range possibilities offered methods for investigation novel physical metallurgy phenomena as well design advanced metals.
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ژورنال
عنوان ژورنال: Additive manufacturing
سال: 2021
ISSN: ['2214-8604', '2214-7810']
DOI: https://doi.org/10.1016/j.addma.2021.102053