First-Principles Study of the Influence of Lattice Misfit on the Behavior and the Ductility Effect of Hafnium in Ni-Ni3Al System

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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
发表期刊	Acta Metallurgica Sinica-English Letters
ISSN	1006-7191
卷号	27 期号:1 页码:87-94
摘要	Two 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.
部门归属	[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
关键词	Hafnium Lattice Misfit Segregation Ductility Grain-boundary Cohesion Single-crystal Superalloys Nickel-base Superalloy Oxidation Behavior Alloying Elements Creep Deformation Site Preference Ni3al Ni Hydrogen
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72938
专题	中国科学院金属研究所
推荐引用方式 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.