Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 150, Issue -, Pages 62-69Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.commatsci.2018.03.072
Keywords
Metallic glasses; Selective laser melting; Atomic structure; Molecular dynamics simulation
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Funding
- Fundamental Research Funds for the Central Universities [2015X KZD02]
- Xuzhou Key Research & Development Program [KC17015]
- National Natural Science Foundation of China [51501220, 51631003]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1701194B]
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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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