HYDROGEN INDUCED CLEAVAGE FRATURE IN Ti_3Al AND ITS MECHANISM
ZHANG Yue; CHU Wuyang; YUAN Runzhang; WANG Yanbin; OUYANG Shixi. XIAO Jimei(State Key Laboratory for Synthesis and Processing of Advanced Matericals;Wuhan University of Technology); Wuhan 430070(University of Science and Technology Beijing); Beijing 100083(Manuscript received 1994-09-28; in revised form 1995-02-23)
Cite this article:
ZHANG Yue; CHU Wuyang; YUAN Runzhang; WANG Yanbin; OUYANG Shixi. XIAO Jimei(State Key Laboratory for Synthesis and Processing of Advanced Matericals;Wuhan University of Technology); Wuhan 430070(University of Science and Technology Beijing); Beijing 100083(Manuscript received 1994-09-28; in revised form 1995-02-23). HYDROGEN INDUCED CLEAVAGE FRATURE IN Ti_3Al AND ITS MECHANISM. Acta Metall Sin, 1995, 31(21): 406-412.
Abstract For Ti-24Al-11Nb alloy,the hydrogen induced crack (HIC) propagation was facilitated through the crack cleavage on the slip planes during dynamic hydrogen charging under either constant or alternating loading at room temperature. The discontinuous HIC was preferentially nucleated in a2-platelets. The α2/βboundaries are effective barriers to HIC nucleation and propagation. Hydrogen induces cleavage fracture by promoting the emission of dislocation at the crack tip as well as the nucleation and propagation of microcracks in the DFZ.Correspondent:(ZHANG Yue, associate professor, State Key. Laboratory .for Synthesis and Processing of Advanced Materials, Wuhan University. of Technology, Wuhan 430070)