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- W2803609904 abstract "The size effect and the effects of a finite-width surface on barrierless transformations between the solid (S), surface melt (SM), and melt (M) from a spherical nanovoid are studied using a phase field approach. Melting (SM → M and S → M) from the nanovoid occurs at temperatures which are significantly greater than the solid-melt equilibrium temperature θe but well below the critical temperature for solid instability. The relationships between the SM and M temperatures and the ratio of the void surface width and width of the solid-melt interface, Δ¯, are found for the nanovoids of different sizes. Below a critical ratio Δ¯*, the melting occurs via SM and the melting temperature slightly reduces with an increase in Δ¯. Both S → SM and SM → M transformations have a jump-like character (excluding the case with the sharp void surface), causing small temperature hysteresis. However, the solid melts without SM for Δ¯>Δ¯*, and the melting temperature significantly increases with increasing Δ¯. The results for a nanovoid are compared with the melting/solidification of a nanoparticle, for which the melting temperatures, in contrast, are much lower than θe. A linear dependency of the melting temperatures with the inverse of the void radius is shown. The present study shows an unexplored way to control the melting from nanovoids by controlling the void size and the width and energy of the surface." @default.
- W2803609904 created "2018-06-01" @default.
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- W2803609904 date "2018-05-14" @default.
- W2803609904 modified "2023-09-29" @default.
- W2803609904 title "Phase field study of surface-induced melting and solidification from a nanovoid: Effect of dimensionless width of void surface and void size" @default.
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- W2803609904 doi "https://doi.org/10.1063/1.5029911" @default.
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