Insight into solid-solution strengthened bulk and stacking faults properties in Ti alloys: a comprehensive first-principles study

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	Insight into solid-solution strengthened bulk and stacking faults properties in Ti alloys: a comprehensive first-principles study
	Wang, WY; Zhang, Y; Li, JS; Zou, CX; Tang, B; Wang, H; Lin, DY; Wang, J; Kou, HC; Xu, DS
刊名	JOURNAL OF MATERIALS SCIENCE
	2018-05-01
卷号	53 期号:10 页码:7493-7505
关键词	Beta-titanium Alloy Total-energy Calculations Close-packed Metals Wave Basis-set Deformation Mechanism Electronic-structures Phase-stability Lattice Misfit Alpha Mg
ISSN号	0022-2461
英文摘要	In the present work, the effect of solute atoms on the lattice parameters, atomic volume, stacking fault energies (), bulk modulus, and bonding structures of HCP Ti is studied comprehensively by first-principles calculations. Here, the alloying effects on the growth fault (I1), deformation fault (I2) and extrinsic fault (EF) are considered, with the solute atoms (X = Al, Cr, Mo, Nb, and V) commonly utilized in the high-strength Ti-7333 and Ti-5553 alloys selected. It is found that the stacking fault energies of pure Ti increase in the order of < < , which is proportional to their corresponding numbers of fault layers. The variation tendencies of of the binary Ti-X alloys are in the order of Al > V > Cr > Mo > Nb for I1 and I2 and V > Al > Cr > Nb > Mo for EF, respectively. The bonding charge density is utilized to characterize the electronic redistributions caused by the fault layers and the lattice distortions. It is presented that the rod-type bonds of the non-fault layers change into the tetrahedral-shaped bonds of fault layers, displaying the local HCP-FCC-type phase transformation. With the addition of various solute atoms with different atomic size and valance electrons, the bond strengths of Ti-Al and Ti-Nb are weaker than those of Ti-Cr and Ti-Mo as there are fewer densities of bonding electrons. This work gains some insights into the atomic and electronic basis for the solid-solution strengthened bulk and stacking faults of HCP Ti, providing fundamental information to the development of advanced high-strength Ti alloys.; In the present work, the effect of solute atoms on the lattice parameters, atomic volume, stacking fault energies (), bulk modulus, and bonding structures of HCP Ti is studied comprehensively by first-principles calculations. Here, the alloying effects on the growth fault (I1), deformation fault (I2) and extrinsic fault (EF) are considered, with the solute atoms (X = Al, Cr, Mo, Nb, and V) commonly utilized in the high-strength Ti-7333 and Ti-5553 alloys selected. It is found that the stacking fault energies of pure Ti increase in the order of < < , which is proportional to their corresponding numbers of fault layers. The variation tendencies of of the binary Ti-X alloys are in the order of Al > V > Cr > Mo > Nb for I1 and I2 and V > Al > Cr > Nb > Mo for EF, respectively. The bonding charge density is utilized to characterize the electronic redistributions caused by the fault layers and the lattice distortions. It is presented that the rod-type bonds of the non-fault layers change into the tetrahedral-shaped bonds of fault layers, displaying the local HCP-FCC-type phase transformation. With the addition of various solute atoms with different atomic size and valance electrons, the bond strengths of Ti-Al and Ti-Nb are weaker than those of Ti-Cr and Ti-Mo as there are fewer densities of bonding electrons. This work gains some insights into the atomic and electronic basis for the solid-solution strengthened bulk and stacking faults of HCP Ti, providing fundamental information to the development of advanced high-strength Ti alloys.
学科主题	Materials Science, Multidisciplinary
语种	英语
资助机构	National Key Research and Development Program of China [2016YFB0701304, 2016YFB0701303]; National Natural Science Foundation of China [51690163]; Fundamental Research Funds for the Central Universities in China [G2016KY0302]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79349]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, WY; Li, JS (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China.
推荐引用方式 GB/T 7714	Wang, WY,Zhang, Y,Li, JS,et al. Insight into solid-solution strengthened bulk and stacking faults properties in Ti alloys: a comprehensive first-principles study[J]. JOURNAL OF MATERIALS SCIENCE,2018,53(10):7493-7505.
APA	Wang, WY.,Zhang, Y.,Li, JS.,Zou, CX.,Tang, B.,...&Li, JS .(2018).Insight into solid-solution strengthened bulk and stacking faults properties in Ti alloys: a comprehensive first-principles study.JOURNAL OF MATERIALS SCIENCE,53(10),7493-7505.
MLA	Wang, WY,et al."Insight into solid-solution strengthened bulk and stacking faults properties in Ti alloys: a comprehensive first-principles study".JOURNAL OF MATERIALS SCIENCE 53.10(2018):7493-7505.