期刊
ACTA MATERIALIA
卷 196, 期 -, 页码 409-417出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.06.048
关键词
Nanoscale concentration modulation; Gradient precipitate microstructure; Spinodal decomposition; Pseudospinodal; Phase field method
资金
- National Key Research and Development Program of China [2016YFB0701302]
- National Natural Science Foundation of China [51671156, 51671158, 51931004]
- 111 project [BP2018008]
Materials with certain heterogeneous microstructures have been shown to hold a synergistic combination of strength and ductility. In this study, we demonstrate novel transformation pathways for creating such heterogeneous microstructure in Ti-alloys by integrating thermodynamic databases with phase field simulations. The results show that the concentration modulations at different length scales produced by (a) precursory spinodal decomposition in the parent phase and (b) interdiffusion in multi-layers having different alloy compositions can generate effectively hierarchical and gradient alpha + beta two-phase microstructures, with a mixture of fine alpha precipitate regions and alpha precipitate-free-zones or coarse alpha precipitate regions. The novel microstructures produced include inverted globular alpha bi-modal microstructures and gradient microstructures with controlled spatial gradients in particle size and number density of alpha precipitates. This study may shed light on how to design novel hierarchical and gradient two-phase microstructures with tunable size and density of precipitates as well as the length scale of their spatial heterogeneity for desired properties. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.
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