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题名: Experimental and DFT characterization of interphase boundaries in titanium and the implications for omega-assisted alpha phase precipitation
作者: Li, DD;  Wan, WF;  Zhu, LQ;  Jiang, Y;  Shao, SQ;  Yang, GJ;  Liu, HQ;  Yi, DQ;  Cao, S;  Hu, QM
发表日期: 2018-6-1
摘要: An intricate understanding of the fundamental beta ->alpha phase transformation upon the presence of metastable omega phase is vital for tailoring the multiphase microstructures of titanium and titanium alloys for various specific applications. To approach this, the structures and energetics of heterophase interfaces among alpha, beta, and omega in titanium were thoroughly investigated, using the combination of high-resolution transmission electron microscopy and first-principles density functional theory calculations. The results strongly suggest that metastable w does not necessarily act as the precursor of alpha but can reduce the energy barrier for a nucleation in beta. The omega/beta interfaces acts as favorable nucleation sites for a which, once forms, tends to grow favorably into the beta matrix. These findings validate the omega-assisted alpha nucleation mechanism, and adequately rationalize many TEM observations on titanium alloys. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
刊名: ACTA MATERIALIA
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
Li, DD,Wan, WF,Zhu, LQ,et al. Experimental And Dft Characterization Of Interphase Boundaries In Titanium And The Implications For Omega-assisted Alpha Phase Precipitation[J]. Acta Materialia,2018,151:406-415.

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