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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Influence of interstitial content on mechanical properties of new type of
near α titanium alloy at cryogenic temperature
LIU Wei(刘 伟), DU Yu(杜 宇), YANG Guan-jun(杨冠军)

Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China

Abstract:The influence of interstitial content on mechanical properties of a new type of near α titanium alloy (Ti-Zr-Mo-Nb-Sn) at cryogenic temperature was studied. The results show that interstitial content affects the mechanical properties of the alloy at cryogenic temperature. Interstitial element atoms solving into lattice causes the increasing of degree of distortion, which limits the sliding and twinning of dislocations. Reducing interstitial content is beneficial to generation of dislocation sliding and deformation twins. With interstitial element content reducing, the impact toughness and the elongation of the alloy decrease rapidly while the strength decreases weakly. To obtain good over-all properties at cryogenic temperature, the interstitial element content in this alloy must be controlled to extra low grade.

 

Key words: interstitial content; oxygen equivalent; α titanium alloy; mechanical properties; cryogenic temperature

ISSN 1672-7029
CN 43-1423/U

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