Acta Metall Sin  1997, Vol. 33 Issue (4): 345-351    DOI:

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HYDROGEN INDUCED-IN DEFECT AND RECOVERY BEHAVIOUR IN POLYCRYSTALLINE NICKEL

ZHAO Faru; WANG Baoyi (Lanzhou University; Lanzhou 730000); TONG Zhichen (Shanghai Mechanical Engineering Collnge; Shanghai 200040); WANG Tianmin (Lanzhou University; Lanzhou 730000;Lanzhou Institute of Chemistry-Physics;Chinese Academy of Sciences; Lanzhou 730000)(Manuscript received 1996-05-10; in revised form 1996-1 1-27)

ZHAO Faru; WANG Baoyi (Lanzhou University; Lanzhou 730000); TONG Zhichen (Shanghai Mechanical Engineering Collnge; Shanghai 200040); WANG Tianmin (Lanzhou University; Lanzhou 730000;Lanzhou Institute of Chemistry-Physics;Chinese Academy of Sciences; Lanzhou 730000)(Manuscript received 1996-05-10; in revised form 1996-1 1-27). HYDROGEN INDUCED-IN DEFECT AND RECOVERY BEHAVIOUR IN POLYCRYSTALLINE NICKEL. Acta Metall Sin, 1997, 33(4): 345-351.

Abstract References Related Articles Recommended Metrics Download:  PDF(643KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Specimens made of fully annealed or plastically deformed polycrystalline nickel are hydrogen charged. The properties and recovery behaviour of the hydrogen induced defects are studied by means of positron annihilation. The measured activation energy for migration of a vacancy is 0.96±0.05 eV. The results showed that both for the fully annealed and plastically deformed polycrystalline nickel, the parameter S and the average lifetime will increase sharply when the specimens were hydrogen charged. The type of the hydrogen charged defects depends on the state of the specimen before charging, in a fully annealed specimen, except some of vacancies and dislocations, the main hydrogen charged defects are the micro voids or the micro cracks, which can not be recovered at above 650℃. Compared with the annealed samples, the hydrogen induced defects are mainly vacancies, dislocations and vacancy clusters, and the microvoids was not found in the deformed nickel specimen. Key words:  hydrogen charging      positron annihilation      polycrystalline nickel      micro defect      Received:  18 April 1997      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/Y1997/V33/I4/345 1Wert C A.In:Alfeld G,Volkl J eds,Hydrogen in Metals.Heidelberg:Springer-Verlag,1978:305 2藤田英一.金属中水素,日本金属学会会报,1979;18(9):613 3Lee S M,Lee J Y.Metall Trans,1986;17A:181 4Szdes C,Lang G,Kajcsos Z.Mater Sci Forum,1992;105-110:1261 5Lee J L,Lee J Y.Ser Metall,1985;19:341 6吴奕初,田中卓.常香荣,肖纪美。物理学报,1991;40(11):1883 7Khanna S K,Sonnenberg K.Radiat Eff, 1981;59:91 8Dlubek G,Brummer O,Hensel E.Phys Status Solidi,1976;34A:737 9Siegel R W,In:Takamura J I,Doyama M,Kiritani M eds,Point Defects and Defect Interactions inMetals.Tokyo:University of Tokyo Press,1982:533 10王天民.核技术,1987;4:7 11Pajak J,Rozenfeld B.In:Jain P C,Singru R M,Gopinathan K P eds.,Positron Annihilation,Singapore:World Scientific Publ Co,1985:558 12Segers D,Humbeeck J V,Delaey L, Dorikens M.In:Jain P C,Singru R M,Gopinathan K P eds.,Positron Annihilation,Singapore:World Scientific Publ Co,1985:880 13高飞,赖文生,王天民。兰州大学学报(自然科学版),1993;29(1):54 14Wang B Y,Gu Q,Wang Y X,Wang T M. 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