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In this study, a unified model of thermoplastic deformation and the corresponding microstructure evolution for tantalum with high purity was first proposed by introducing the state variable equations of recrystallization fraction, average grain size, and grain growth. The subroutine of microstructure evolution model was programed for embedding into the finite element simulation of tantalum plates upon rolling and annealing, and the parameters of microstructure evolution were obtained by fitting the experimental data. Our simulation results reveal the correlations among the microstructures, rolling reduction, annealing temperature and time. Based on these findings, a guideline for optimizing the microstructure of tantalum is proposed.

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