Environmental and internal hydrogen embrittlement of a directionally solidified Ni-rich Ni3Al intermetallics

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	Environmental and internal hydrogen embrittlement of a directionally solidified Ni-rich Ni3Al intermetallics
	J. Q. Su; S. J. Gao; Z. Q. Hu
	2000
发表期刊	Journal of Materials Science
ISSN	0022-2461
卷号	35 期号:6 页码:1433-1438
摘要	The influence of tensile orientation, test environments and internal hydrogen contents on the room temperature tensile properties of a directionally solidified Ni3Al alloy was investigated. The specimens parallel to the growth direction exhibited a good ductility and little susceptibility to test environment. The values of elongation in vacuum, air and H-2 are 39.7%, 39.2% and 29.7%, respectively. Also, a transgranular fracture mode was observed in the specimens. However, the specimens perpendicular to the growth direction exhibited lower ductility, much more sensitivity to test environment and intergranular fracture mode. The elongation values in vacuum, air and H-2 are 13.7%, 10.3% and 3.3%, respectively. The results indicate that the cohesive strength of grain boundaries in the alloy is low and they are more susceptible to test environment than are grain interiors. In addition, only a slight embrittlement of the internal hydrogen was found in the specimens parallel to the growth direction. (C) 2000 Kluwer Academic Publishers.
部门归属	chinese acad sci, inst met res, shenyang 110015, peoples r china.;su, jq (reprint author), natl res inst met, mech properties div, 1-2-1 sengen, tsukuba, ibaraki 3050047, japan
关键词	Room-temperature Ductility Unidirectional Solidification Stoichiometric Ni3al Single-crystals Polycrystalline Ni3al Major Cause Fracture Deformation Improvement Behavior
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WOS记录号	WOS:000085186000018
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37162
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Q. Su,S. J. Gao,Z. Q. Hu. Environmental and internal hydrogen embrittlement of a directionally solidified Ni-rich Ni3Al intermetallics[J]. Journal of Materials Science,2000,35(6):1433-1438.
APA	J. Q. Su,S. J. Gao,&Z. Q. Hu.(2000).Environmental and internal hydrogen embrittlement of a directionally solidified Ni-rich Ni3Al intermetallics.Journal of Materials Science,35(6),1433-1438.
MLA	J. Q. Su,et al."Environmental and internal hydrogen embrittlement of a directionally solidified Ni-rich Ni3Al intermetallics".Journal of Materials Science 35.6(2000):1433-1438.