Morphological stability of three-dimensional cementite rods in polycrystalline system: A phase-field analysis

Transformations accompanying shape-instability govern the morphological configuration and distribution of phases in a microstructure. Owing to influence microstructure on properties material, present work, stability three-dimensional rods ‘representative’ polycrystalline system is extensively analysed. A multiphase-field model, which recovers physical laws sharp-interface relations, includes grain boundary diffusion, adopted investigate evolution precipitate. Moreover, efficiency numerical approach ensured by establishing volume-preserving chemical equilibrium through incorporation TCFe8 (CALPHAD) data solving phase-field Allen-Cahn framework. The rod representative multiphase exhibits unique transformation mechanism significantly different from an isolated finite-structure. It realised that, arrangement, irrespective initial size rod, shape-change begins with energy-minimising events at triple junctions. This early renders characteristic morphology longitudinal ends structure, introduces sufficient driving-force curvature-difference for subsequent changes. continued mass transfer terminations, ultimately, breaks-off into separate entities that are entangled boundary. With increase aspect ratio it identified source transfer, turns ovulation site, shifts centre. increases number fragmentation satellite particle. particle dictated definite criterion, ascertained examining different-sized rods. comprehensive understanding kinetics governing rendered this work.