Acta Metall Sin  1998, Vol. 34 Issue (4): 337-344    DOI:

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IN SITU TEM STUDY OF DISLOCATION EMISSION AND MICROCRACK NUCLEATION FOR α-Ti AFTER ADSORBING Hg

SU Yanjing; LU Hong; WANG Yanbin; CHU Wuyang (Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083)

SU Yanjing; LU Hong; WANG Yanbin; CHU Wuyang (Department of Materials Physics; University of Science and Technology Beijing; Beijing 100083). IN SITU TEM STUDY OF DISLOCATION EMISSION AND MICROCRACK NUCLEATION FOR α-Ti AFTER ADSORBING Hg. Acta Metall Sin, 1998, 34(4): 337-344.

Abstract References Related Articles Recommended Metrics Download:  PDF(3515KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Using a special constant deflection device, the change in dislocation configuration ahead of a loaded crack tip for α-Ti before and after adsorption of Hg atoms, and the initiation of Hg--induced microcrack have been observed in TEM, as well as the in situ extension in TEM without Hg. The results showed that chemisorption of Hg atoms could facilitate dislocation emission and motion. When the dislocation emission and motion developed into a critical situation, a microcrack induced by liquid metal would nucleate from the main crack tip or/and in dislocation free zone (DFZ), and propagate in cleavage mode. During in site extension in TEM without the liquid metal, only when dislocation emission and motion induced by thermal activity and applied stress reached a certain critical condition, microcrack would nucleate but not blunt into a void. Key words:  α-Ti      TEM      dislocation emission      liquid metal embrittlement      Received:  18 April 1998      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/Y1998/V34/I4/337 1 Nicholas M G, Old C F.J Mater Sci, 1979; 14: 1 2 Kamdar M H. Progr, Mate, Sci, 1973; 15: 189 3 Kelley M J, Stoloff N S. Metall Trans, 1975; 6A: 159 4Lynch S P. Acta Metall, 1988; 36: 2639 5Chen Q Z, Chu W Y; Hsiao C M. Acta Metall Mater, 1995; 43: 4371 6 张 跃,王燕斌,褚武扬,肖纪美.中国科学,1994;A24:551Zhang Yue,Wang Yanbin,Chu Wuyang,Xiao Jimei. Sci Chin,1994; A24:551) 7高克玮,陈奇志,褚武扬,肖纪美.中国科学, 1994; A24: 993 8 (Gao Kewei,Chen Qizhi,Chu Wuyang,Xiao Jimei.Sci Chin, 1994; A24:993)8 谷飙,高克玮,黄一中,褚武扬中国科学,1996;E26:4819(Gu Biao,Gao Kewei, Huang Yizhong,Chu Wuyang. Sci Chin, 1996; E26:481)9宿彦京,王燕斌,褚武扬科学通报,19972 42:1 (Su Yanjing,Wang Yanbin,Chu Wuyang Chin Sci Bull, 1997; 42:1) 10Worner N W. 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