The 9th International Conference on Multiscale Materials Modeling

講演情報

Symposium

I. Multiscale Modeling of Grain Boundary Dynamics, Grain Growth and Polycrystal Plasticity

[SY-I1] Symposium I-1

2018年10月29日(月) 13:30 〜 15:15 Room7

Chairs: David Sroloviz(University of Pennsylvania, USA), Enrique Martinez Saez(Los Alamos National Laboratory, USA)

[SY-I1] Verification of grain growth models by time-resolved 3D experiments in pure iron

Jin Zhang1,2, Yubin Zhang2, Wolfgang Ludwig3, David Rowenhorst4, Henning F Poulsen2, Peter W Voorhees1 (1.Northwestern University, United States of America, 2.Technical University of Denmark, Denmark, 3.European Synchrotron Radiation Facility, France, 4.The US Naval Research Laboratory, United States of America)

Predicting the grain growth behavior of polycrystalline materials is important in the design of material properties in many engineering applications. Various analytical models are proposed to predict the growth behavior, e.g., grain size distribution from the Hillert’s theory or local growth behavior, e.g., the growth rate from the MacPherson-Srolovitz theory. However, experimental verification of these models is lacking. In this work, we present a unique comprehensive dataset with 1300 grains and 15 annealing time-steps, which allows us to test various models for grain growth. In particular, we focus on the MacPherson-Srolovitz theory and address to what extent various statistical ensembles can be meaningfully described by the model and to what extent it is required to include anisotropy. A comprehensive statistical analysis shows that geometrical properties averaged over the entire grain ensemble are well described by the model, but the properties and evolution of the individual grains exhibit substantial scatter.