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Site Occupation of Nb in gamma-TiAl: Beyond the Point Defect Gas Approximation
Diao, Wei; Ye, Li-Hua; Ji, Zong-Wei; Yang, Rui; Hu, Qing-Miao
2019-12-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume32Issue:12Pages:1511-1520
AbstractMicroalloying is an effective approach to improve the mechanical properties of gamma-TiAl intermetallic compound. Knowledge about the site occupancy of the ternary alloying element in the crystal lattice of gamma-TiAl is highly demanded in order to understand the physics underlying the alloying effect. Previous first-principle methods-based thermodynamic models for the determination of the site occupancy were based on the point defect gas approximation with the interaction between the point defects neglected. In the present work, we include the point defect interaction energy in the thermodynamic model, which allows us to predict the site occupancy of the ternary alloying element in gamma-TiAl beyond the point defect gas approximation. The model is applied to the gamma-TiAl-Nb alloy. We show that, at low temperature, the site occupancy of Nb atoms depends on the composition of the alloy: Nb atoms occupy the Al sublattice for the Ti-rich alloy but occupy Ti sublattice for the Al-rich alloy. The fraction of Nb atoms occupying Al sublattice in the Ti-rich alloy decreases drastically, whereas the fraction of Nb atoms on the Ti sublattice in the Al-rich alloy decreases slightly with increasing temperature. At high temperature, Nb atoms occupy dominantly the Ti sublattice for both the Ti-rich and Al-rich alloys. The interaction between the point defects makes the Ti sublattice more favorable for the Nb atoms to occupy.
KeywordSite preference Titanium aluminides Special quasi-random structures First principles method
Indexed BySCI
Language英语
WOS IDWOS:000495116000008
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80591
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Diao, Wei,Ye, Li-Hua,Ji, Zong-Wei,et al. Site Occupation of Nb in gamma-TiAl: Beyond the Point Defect Gas Approximation[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(12):1511-1520.
APA Diao, Wei,Ye, Li-Hua,Ji, Zong-Wei,Yang, Rui,&Hu, Qing-Miao.(2019).Site Occupation of Nb in gamma-TiAl: Beyond the Point Defect Gas Approximation.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(12),1511-1520.
MLA Diao, Wei,et al."Site Occupation of Nb in gamma-TiAl: Beyond the Point Defect Gas Approximation".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.12(2019):1511-1520.
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