Atomic-scale structural evolution in selective laser melting of Cu50Zr50 metallic glass
Y Zhang and HS Liu and JY Mo and MZ Wang and Z Chen and YZ He and WM Yang and CG Tang, COMPUTATIONAL MATERIALS SCIENCE, 150, 62-69 (2018).
Selective laser melting (SLM) provides a promising alternative to overcome the size and geometry limitation in the fabrication of metallic glasses (MGs). Understanding the change of atomic-scale structure is vital to glass formation and the properties of SLM-fabricated MGs. In this work, atomic structural evolution of Cu50Zr50 MG fabricated by SLM was investigated using molecular dynamics simulations. Voronoi tessellation analysis indicates that icosahedron-like clusters and Frank-Kasper polyhedra are dominant in cladding and deposited layers. In addition, the fractions of populous icosahedron- like clusters decrease in molten pool while slightly increase in heat affected zone during SLM process, and the fractions of populous Frank-Kasper polyhedra remain virtually unchanged after laser melting and heat affecting. This work provides a necessary understanding and novel guidance to the fabrication of MGs using SLM.
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