Atom location by channeling enhanced microanalysis study of site distributions of alloying elements in titanium aluminides

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	Atom location by channeling enhanced microanalysis study of site distributions of alloying elements in titanium aluminides; Atom location by channeling enhanced microanalysis study of site distributions of alloying elements in titanium aluminides
	Y. L. Hao; R. Yang; Y. Y. Cui; D. Li
	2000 ; 2000
发表期刊	Journal of Materials Research ; Journal of Materials Research
ISSN	0884-2914 ; 0884-2914
卷号	15 期号:11 页码:2475-2481
摘要	The original equation of Spence and Tafto for quantitative determination of site occupancy using atom location by channeling enhanced microanalysis method has been extended to take into account both delocalization effect and the influence of point defects (antisite atomic distribution and vacancies). The outcome of this treatment suggests that, for crystals free of antisite defects, the accuracy of site occupancy is influenced by delocalization effect but is independent of both thermal and structural vacancies. For crystals free of structural vacancies, the accuracy of site occupancy is influenced by both delocalization effect and antisite defects, but is independent of thermal vacancies. The delocalization effect was shown to vary with channeling strength at a given channeling condition. For a binary ordered phase in which at least one of the host elements exhibits weak delocalization effect las is the case for many transition-metal aluminides), a tangent-line method for obtaining the value of k (a parameter necessary for the calculation of site occupancy) was proposed, allowing the determination of the delocalization correction factor for the other host element. Application of this method to estimating the delocalization effect of Al in Ti3Al and TiAl under axial and planar channeling conditions, respectively, was demonstrated.; The original equation of Spence and Tafto for quantitative determination of site occupancy using atom location by channeling enhanced microanalysis method has been extended to take into account both delocalization effect and the influence of point defects (antisite atomic distribution and vacancies). The outcome of this treatment suggests that, for crystals free of antisite defects, the accuracy of site occupancy is influenced by delocalization effect but is independent of both thermal and structural vacancies. For crystals free of structural vacancies, the accuracy of site occupancy is influenced by both delocalization effect and antisite defects, but is independent of thermal vacancies. The delocalization effect was shown to vary with channeling strength at a given channeling condition. For a binary ordered phase in which at least one of the host elements exhibits weak delocalization effect las is the case for many transition-metal aluminides), a tangent-line method for obtaining the value of k (a parameter necessary for the calculation of site occupancy) was proposed, allowing the determination of the delocalization correction factor for the other host element. Application of this method to estimating the delocalization effect of Al in Ti3Al and TiAl under axial and planar channeling conditions, respectively, was demonstrated.
部门归属	chinese acad sci, inst met res, shenyang 110015, peoples r china.;hao, yl (reprint author), chinese acad sci, inst met res, 72 wenhua rd, shenyang 110015, peoples r china ; chinese acad sci, inst met res, shenyang 110015, peoples r china.;hao, yl (reprint author), chinese acad sci, inst met res, 72 wenhua rd, shenyang 110015, peoples r china
关键词	General Formulation General Formulation Electron-diffraction Electron-diffraction x Alloys x Alloys Alchemi Alchemi Occupancies Occupancies Ti3al Ti3al Additions Additions
URL	查看原文 ; 查看原文
WOS记录号	WOS:000165275400032 ; WOS:000165275400032
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37040
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. L. Hao,R. Yang,Y. Y. Cui,et al. Atom location by channeling enhanced microanalysis study of site distributions of alloying elements in titanium aluminides, Atom location by channeling enhanced microanalysis study of site distributions of alloying elements in titanium aluminides[J]. Journal of Materials Research, Journal of Materials Research,2000, 2000,15, 15(11):2475-2481, 2475-2481.
APA	Y. L. Hao,R. Yang,Y. Y. Cui,&D. Li.(2000).Atom location by channeling enhanced microanalysis study of site distributions of alloying elements in titanium aluminides.Journal of Materials Research,15(11),2475-2481.
MLA	Y. L. Hao,et al."Atom location by channeling enhanced microanalysis study of site distributions of alloying elements in titanium aluminides".Journal of Materials Research 15.11(2000):2475-2481.