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Properties of beta/omega phase interfaces in Ti and their implications on mechanical properties and omega morphology
Cao, Shuo; Jiang, Yong; Yang, Rui; Hu, Qing-Miao
2019-02-15
Source PublicationCOMPUTATIONAL MATERIALS SCIENCE
ISSN0927-0256
Volume158Pages:49-57
Abstractomega phase precipitating in a beta-Ti alloy is generally detrimental to the ductility and plasticity of the alloy.To understand the influence of omega phase on the mechanical properties of beta-Ti alloys, the property of the beta/omega interface is demanded.In this regard, we calculate the interface energies (gamma(int)), cleavage energies (gamma(cl)), and generalized stacking fault energies (gamma) of the beta/omega interfaces with different orientations using a first-principles method.Our calculations predict interface energies of 0.32 J m(-2) and 0.03 J m(-2) for the (1 1 (1) over bar)(beta)/(0 0 0 1)(omega) and (1 1 2)(beta)/(1 0 (1) over bar 0)(omega) interfaces, respectively.The strong anisotropy of the interface energy contributes to the ellip-soid-like morphology of omega phase with its major axis parallel to the < 1 1 1 >(beta) direction.The influence of the interface on the ductility of the alloy is discussed with the calculated cleavage energies and the unstable stacking fault energies (gamma(us)) extracted from the generalized stacking fault energy (GSFE). The gamma(cl)/gamma(us) ratio of the (1 1 2)(beta)/(1 0 10)(omega) interface is lower than those of the main slip planes of the bulk phases, indicating that this interface is prone to crack initiation and propagation as compared to the bulk and contributes to theca-embrittlement of beta-Ti alloys.
KeywordTitanium alloys Generalized stacking fault energy Interface energy First-principles calculations
Indexed BySCI
Language英语
WOS IDWOS:000456022400007
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81369
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Cao, Shuo,Jiang, Yong,Yang, Rui,et al. Properties of beta/omega phase interfaces in Ti and their implications on mechanical properties and omega morphology[J]. COMPUTATIONAL MATERIALS SCIENCE,2019,158:49-57.
APA Cao, Shuo,Jiang, Yong,Yang, Rui,&Hu, Qing-Miao.(2019).Properties of beta/omega phase interfaces in Ti and their implications on mechanical properties and omega morphology.COMPUTATIONAL MATERIALS SCIENCE,158,49-57.
MLA Cao, Shuo,et al."Properties of beta/omega phase interfaces in Ti and their implications on mechanical properties and omega morphology".COMPUTATIONAL MATERIALS SCIENCE 158(2019):49-57.
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