Acta Metall Sin  1986, Vol. 22 Issue (3): 43-152    DOI:

Current Issue | Archive | Adv Search |

IN SITU STUDY OF EFFECT OF HYDROGEN ON DEFORMATION AND FRACTURE BEHAVIOUR IN Nb

by CHEN Lian; LIU Minzhi; SU Huihe (Institute of Metal Research; Academia Sinica; Shenyang)

by CHEN Lian; LIU Minzhi; SU Huihe (Institute of Metal Research; Academia Sinica; Shenyang). IN SITU STUDY OF EFFECT OF HYDROGEN ON DEFORMATION AND FRACTURE BEHAVIOUR IN Nb. Acta Metall Sin, 1986, 22(3): 43-152.

Abstract References Related Articles Recommended Metrics Download:  PDF(3793KB)  Export:  BibTeX | EndNote (RIS)       Abstract  SEM and optical microscope in situ examinations under tensile loading were performed on the effect of hydrogen upon the microprocess of deformation and fracture behaviour in cathodic charged pure Nb. The Nb hydrides are found to precipitate on the {100} plane of matrix. Most dendritic hydrides in orthorhombic needleshape are of the Widmanstatten structure. The slip lines and grain boundary hunches are obviously observed in the α-solid solution matrix with hydrogen dissolved under tensile deformation. The microcracks initiated themself along the slip lines predominately and the deformation bands as well as the grain boundary oriented normal to the stress axis. The main crack propagation is the coalescence of micro-craks in the vicinity of the crack tip and through the transgranular path. The α-solid solution matrix with β-hydride is extremely brittle and of transgranular cleavage fracture under tension. The micro-patterns featuring all brittle fractures and two β-hydrides are appeared on the cleavage facets. The mierocrack growth are presented at the hydride/matrix interface. The crystal orientation of hydrogen embrittlement cleavage facets in pure Nb, the stress induced β-hydride and two typical hydrogen embrittlement mechanisms of pure Nb have been also discussed. Received:  18 March 1986      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1986/V22/I3/43 1 陈廉;刘民治;苏会和;尹万全;李翠屏,金属学报,17 (1981) ,541． 2 Schober, T.; Wenzl, H., Hydrogen in Metal, Ⅱ, Eds. Alefeld, G.; Voelkl, J., Springer-Verlag, Berlin, 1978, p. 32． 3 Alefeld, G.; Peisl, H.; Langeler, B.; Venzl, H.; Soringer, T.; Voelkl, J.; Wipf, H.; Wanger, H., Seminar on Hydrogen in Metals, Shenyang, Peoples Republic of China, 1981． 4 Birnbaum, H.K., Atomistics of Fracture, Eds. Latanision, R.M.; Pickens, J.R., 1983, p. 733-769． 5 Gahr, S.; Grossbeck, M.L.; Birnbaum, H.K., Acta Metall., 25 (1977) , 125． 6 Grossbeck, M.L.; Birnbaum, H.K., Acta Metall., 25 (1977) , 137． 7 Gahr, S.; Birnbaum, H.K., Acta Metall., 26 (1978) , 1781． 8 Gahr, S.; Birnbaum, H.K., Acta Metall., 16 (1978) , 1207． 9 Birnbaum, H.K.; Grossbeck, M.L.; Amano, M., J. Less-Common Met., 49 (1976) , 357． 10 Birnbaum, H.K.; Gahr, S., Hydrogen in Metals, Eds. Bernstein, I.M.; Thompson, A.W., ASM, 1974, p. 303． 11 Farahami, M.M.; Attia, F.; Salama, K., Metall Trans., 12A (1981) , 631． 12 Churchman. A.T., J. Inst. Met., 88 (1959/60) , 221． 13 Sagues, A.A.; Ulitchng, M.G.; Gibala, R., Effect of Hydrogen on the Behavior of Materials, Eds. Thompson, A.W.; Bernstein, I.M., TMS-AIME, New York, 1976, p. 309． 14 Hardie, D.; McIntyre, P., Metall Trans., 4 (1973) , 1247． 15 Amano, M.; Sasaki, Y., Phys. Status Solidi, (a), 19 (1973) , 405． No related articles found! No Suggested Reading articles found! Viewed Full text Abstract Cited   Shared      Discussed