Interaction of hydrogen and boron with defects in polycrystalline Ni3Al alloys investigated by the positron annihilation technique

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	Interaction of hydrogen and boron with defects in polycrystalline Ni3Al alloys investigated by the positron annihilation technique
	W. Deng; L. Y. Xiong; C. W. Lung; S. H. Wang; J. T. Guo
	1997
发表期刊	Intermetallics
ISSN	0966-9795
卷号	5 期号:4 页码:265-269
摘要	The cathodic charging of hydrogen into polycrystalline Ni3Al alloys with B contents from 0.00 to 2.22 at% has been studied by measurements of the positron lifetime spectra. Hydrogen-filling effects and hydrogen-harmful effects are found in all testing alloys. Hydrogen effects are weak in Ni3Al with 0.52 at% B and Ni3Al with 1.37 at% B compared with that in B free Ni3Al and Ni3Al with 2.22 at% B. This indicates that suitable B atoms segregating to the grain boundary can strengthen the bond cohesions in the grain boundary, as well as counteract hydrogen entering there, and then suppress both the hydrogen-filling effects and hydrogen-harmful effects in Ni3Al alloys. When B added up to 2.22 at%, more defects are induced by boride eutectics forming in the bulk and grain boundary, and the metallic bond cohesions are decreased in those locations. This leads to the enhancements of both the hydrogen-filling and the hydrogen-harmful effects in Ni3Al with 2.22 at% B. (C) 1997 Elsevier Science Ltd.
部门归属	liaoning key lab mat & hydrogen,shenyang 110015,peoples r china. acad sinica,int ctr mat phys,shenyang 110015,peoples r china. acad sinica,inst met res,shenyang 110015,peoples r china.;deng, w (reprint author), guangxi univ,dept phys,nanning 530004,peoples r china
关键词	Nickel Aluminides Spectroscopic Methods Based On Ni3al Environmental Embrittlement Various Intermetallic Compound Ni3al Grain-boundary Fracture Environmental Embrittlement Intergranular Fracture Single-crystals Major Cause Ductility Sulfur Deformation Segregation
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37950
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. Deng,L. Y. Xiong,C. W. Lung,et al. Interaction of hydrogen and boron with defects in polycrystalline Ni3Al alloys investigated by the positron annihilation technique[J]. Intermetallics,1997,5(4):265-269.
APA	W. Deng,L. Y. Xiong,C. W. Lung,S. H. Wang,&J. T. Guo.(1997).Interaction of hydrogen and boron with defects in polycrystalline Ni3Al alloys investigated by the positron annihilation technique.Intermetallics,5(4),265-269.
MLA	W. Deng,et al."Interaction of hydrogen and boron with defects in polycrystalline Ni3Al alloys investigated by the positron annihilation technique".Intermetallics 5.4(1997):265-269.