Simulation of neck growth and shrinkage for realistic temperature profiles - Determination of diffusion coefficients in a practical oriented procedure

摘要

Interfacial self-diffusion coefficients of pure Titanium are determined using sinter simulation. Depicting surface and grain boundary and volume diffusion the evolution of sinter necks in the first sinter stage is simulated. In an optimization procedure, the deviations from experimentally determined data are minimized. Since the model used is not limited to isothermal sintering, experimental effort is low. Spherical powder is sintered using different temperature profiles and the respective final state is evaluated. Since the coefficients found could also be useful for more versatile model approaches, a comparative calculation with the results of a recently published phase field model is discussed. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.