Volume 133, Number 5, March 2021
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||11 May 2021|
Formation and stability of nanosized, undercooled propagating intermediate melt during β → δ phase transformation in HMX nanocrystal
University of Michigan, Materials Science and Engineering - Ann Arbor, MI 48109, USA
Received: 16 November 2020
Accepted: 20 February 2021
The formation and stability of a nanosized propagating intermediate melt (IM) have been analyzed more than below the melting temperature between the solid-solid (SS) phase boundary during phase transformation (PT) in a HMX nanocrystal. The influence of the solid-melt barrier K12 and two important nanoscale material parameters (ratios of SS and solid-melt SM interface energies, kE and width, ) on the barrierless nucleation and appearance of non-equilibrium IM has been studied. Numerical results reveal that the solution of IM can either be continuous reversible or jump-like first-order discontinuous transformation with hysteresis. Additionally, various parametric studies on the structure, energy, width, and mobility of IM have been explored to understand the mystifying PT behaviors of HMX.
PACS: 64.60.Bd – General theory of phase transitions / 64.70.K- – Solid-solid transitions / 74.20.De – Phenomenological theories (two-fluid, Ginzburg-Landau, etc.)
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