Abstract
Understanding coalescing or sintering between particles at atomic scale is of significance for accurately controlling additive manufacturing processes. In this research, thermodynamics quantities and rotation behaviors are monitored to reveal multi-stages scenario of structural changes during sintering two equally sized Ti particles, where bulk Ti can undergo the transformation between a low-temperature HCP and a high-temperature BCC. The coalescing or sintering process and finally packing structure is significantly affected by temperature and contacting facets with various crystallographic orientations. Coalescing and sintering temperature regimes are identified from the calculations of the melting point for single particle. Energy and visually packing images characterize structural transitions including HCP-BCC, rearrangements of surface atoms, and BCC-melt. The temporal evolution of shrinkage factor and atomic level stresses show different stages for the inelastic encounter between the particles. Nanoparticles undergo reorientation, deformation, atomic diffusion, and rearrangements in surface and interfacial regions, which affect the formation and growth of connecting region. Our simulation results reveal that some orientation contacts and temperatures are effective in terms of coalescing or sintering.
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We acknowledge the financial support from the National Natural Science Foundation of China (No. 51671051).
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Zhang, L. Modeling the Effect of Crystallographic Orientations on Coalescing and Sintering for Two Ti Nanoparticles with Equal Size at Atomic Scale. J. of Materi Eng and Perform 30, 8336–8348 (2021). https://doi.org/10.1007/s11665-021-06018-2
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DOI: https://doi.org/10.1007/s11665-021-06018-2