On the Characterization of a Hitherto Unreported Icosahedral Quasicrystal Phase in Additively Manufactured Aluminum Alloy AA7075
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Aluminum alloy AA7075 (Al-Zn-Mg-Cu) specimens were prepared using selective laser melting, also known as powder bed fusion additive manufacturing. In the as-manufactured state, which represents a locally rapidly solidified condition, the prevalence of a previously unreported icosahedral quasicrystal with 5-fold symmetry was observed. The icosahedral quasicrystal, which has been termed ν-phase (nu-phase), was comprised of Zn, Cu, and Mg.
The images herein were collected at the Monash Centre for Electron Microscopy (MCEM), aided by fruitful discussions with M. Weyland. We gratefully acknowledge support by Woodside Energy.
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