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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 2    September 2009

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Effects of hydrogenation on ambient deformation behaviors of Ti-45Al alloy
SU Yan-qing(苏彦庆), LIU Xin-wang(刘鑫旺), ZHAO Long(赵 龙),
WANG Liang(王 亮), GUO Jing-jie(郭景杰), FU Heng-zhi(傅恒志)

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:Effects of hydrogenation on ambient deformation behaviors of Ti-45Al alloy were studied. The stress—strain curves demonstrate that the plastic deformation of the hydrogenated alloys becomes more remarkable than that of the unhydrogenated alloy. Meanwhile, the compression strength and maximum strain are reduced. Both the hydride and hydrogen atoms in the interstices affect the compression deformation behaviors. The reason of the hydrogen-induced embrittlement is that the hydride is easy to become the nucleus of the cracks. And the variation of plastic deformation process is attributed to hydrogen-promoted emission, multiplication and motion of dislocation.

 

Key words: hydrogen; TiAl alloy; hydride; dislocation; fracture

ISSN 1672-7029
CN 43-1423/U

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