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First-Principles Study of the Influence of Lattice Misfit on the Behavior and the Ductility Effect of Hafnium in Ni-Ni3Al System
Y. X. Wu; J. Guo; J. S. Hou; W. L. Zhang; R. Z. Huang; X. G. Liu; X. F. Ma; Q. F. Zhang
2014
Source PublicationActa Metallurgica Sinica-English Letters
ISSN1006-7191
Volume27Issue:1Pages:87-94
AbstractTwo Ni/Ni3Al-interface-contained cluster models with/without lattice misfit are studied by first-principles method to clarify the debates about the segregation behaviors of Hafnium (Hf) and explore the influence of lattice misfit on the ductility effect of Hf. It is found that though Hf prefers to substitute Al rather than Ni in Ni3Al phase within most of the investigated misfit range, its stronger preferring to Ni phase than Ni3Al phase makes it impossible to go into Ni3Al phase to occupy Al site in Ni Ni3Al alloys. Bond order analysis in Hf-free case shows that lattice misfit has different effects on the Griffith work of interfacial cleavage 2 gamma int/E and the maximum theoretical shear stress tau(max) of Ni and Ni3Al, contributing to the existence of anomalous strength-temperature phenomena in Ni3Al alloys. However, the addition of Hf will make the 2 gamma(int)/E (or tau(max)) of both Ni3Al and Ni decrease (or increase) with lattice misfit, indicating that the addition of Hf may make the anomalous strength-temperature relationship in Ni3Al region disappear locally.
description.department[wu, yuxi ; guo, jia ; zhang, wanglin ; ma, xiufang ; zhang, qianfeng] anhui univ technol, inst mol engn & appl chem, maanshan 243002, peoples r china. [hou, jieshan] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [huang, renzhong] shenyang normal univ, coll phys sci & technol, shenyang, peoples r china. [liu, xianguo] anhui univ technol, sch mat sci & engn, maanshan 243002, peoples r china. ; wu, yx (reprint author), anhui univ technol, inst mol engn & appl chem, maanshan 243002, peoples r china. ; yxwu@ahut.edu.cn
KeywordHafnium Lattice Misfit Segregation Ductility Grain-boundary Cohesion Single-crystal Superalloys Nickel-base Superalloy Oxidation Behavior Alloying Elements Creep Deformation Site Preference Ni3al Ni Hydrogen
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Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/72938
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Y. X. Wu,J. Guo,J. S. Hou,et al. First-Principles Study of the Influence of Lattice Misfit on the Behavior and the Ductility Effect of Hafnium in Ni-Ni3Al System[J]. Acta Metallurgica Sinica-English Letters,2014,27(1):87-94.
APA Y. X. Wu.,J. Guo.,J. S. Hou.,W. L. Zhang.,R. Z. Huang.,...&Q. F. Zhang.(2014).First-Principles Study of the Influence of Lattice Misfit on the Behavior and the Ductility Effect of Hafnium in Ni-Ni3Al System.Acta Metallurgica Sinica-English Letters,27(1),87-94.
MLA Y. X. Wu,et al."First-Principles Study of the Influence of Lattice Misfit on the Behavior and the Ductility Effect of Hafnium in Ni-Ni3Al System".Acta Metallurgica Sinica-English Letters 27.1(2014):87-94.
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