Abstract
The present work aims to investigate the barrierless nucleation of a molten interface at solid-solid phase boundary, significantly below melting temperature during solid-solid phase transformations (PTs) in energetic nitramine octahydro-1, 3, 5, 7-tetranitro-1, 3, 5, 7-tetrazocine by utilizing a thermodynamically consistent multiphase phase-field model. The instability conditions for barrierless PTs have been presented for each phase and the effect of finite barrier term characterizing the interaction of two solid-melt interfaces on the different instability conditions are analyzed for some critical conditions. Additionally, barrierless melt nucleation has been studied for the different range of nanoscale material parameters and temperature which reveals nontrivial interaction of interfaces. Similar phenomena are expected to occur during PTs in pharmaceutical, ferroelectric, colloidal, and superhard materials.
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