Coupling of homogeneous and heterogeneous melting kinetics in polycrystalline materials
Abstract
Melting kinetics of polycrystalline materials is analyzed on the basis of a new model which explicitly couples homogeneous and heterogeneous melting mechanisms. The distinct feature of this approach lies in its ability to evaluate not only grain-size-distribution effects on the overall melting kinetics but also competitions between the two melting mechanisms. For the first time, we reveal the three-part structure of temperature-time-transformation diagrams for melting of polycrystalline materials, through which it is possible to determine a critical temperature across which the dominant melting mechanism switches. The critical temperature increases as the mean-grain-diameter decreases following a negative power-law. The results are qualitatively consistent with experimental observations.
Keywords
Cite
@article{arxiv.1904.07397,
title = {Coupling of homogeneous and heterogeneous melting kinetics in polycrystalline materials},
author = {Meizhen Xiang and Yi Liao and Guomeng Li and Jun Chen},
journal= {arXiv preprint arXiv:1904.07397},
year = {2019}
}
Comments
1. MD simulation results are deleted. 2. The parameter table is added. 3. Qualitative comparisons with experiments are added. 4. Limitations of the model are added