Acta Metall Sin  1995, Vol. 31 Issue (4): 156-164    DOI:

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IN SITU TEM OBSERVATION OF DISLOCATION EMISSION, MOTION INDUCED BY ANODIC DISSOLUTION AND THE INITIATION OF SCC IN BRASS THIN FOIL

GU Biao; ZHANG Jingwu; WAN Farong; CHU Wuyang(Deportment of Materials Physics; University of Sci ence and Tech nology; Beijing; Beijing 100083)

GU Biao; ZHANG Jingwu; WAN Farong; CHU Wuyang(Deportment of Materials Physics; University of Sci ence and Tech nology; Beijing; Beijing 100083). IN SITU TEM OBSERVATION OF DISLOCATION EMISSION, MOTION INDUCED BY ANODIC DISSOLUTION AND THE INITIATION OF SCC IN BRASS THIN FOIL. Acta Metall Sin, 1995, 31(4): 156-164.

Abstract References Related Articles Recommended Metrics Download:  PDF(750KB)  Export:  BibTeX | EndNote (RIS)       Abstract  篢he in situ TEM observations of dislocation emission, motion and the initiation of nanocrack in brass in corrosive solution were carried out. Using a special constant displacement device, the dislocation configuration change ahead of a loaded crack tip before and after anodic dissolution in the deionized water and the initiation, propagation of nanometre scale stress corrosion cracks has been observed. The results showed that SCC in brass thin foil specimen could occur in water. The localized anodic dissolution of brass in water at room temperature facilitated dislocation emission, multiplication and motion. A nanocrack initiated in the DFZ or at the blunted crack tip in corrosion solution after dislocations emission, multiplication and motion reached a critical condition. Because of the influence of the corrosion solution, the nanocrack will propagate and form a cleavage or intergranular microcrack during stress corrosion instead of blunting in to a void as it does during a tension test without solution. Key words:  brass      dissolution facilitating dislocation emission      SCC      TEM in situ observation      Received:  18 April 1995      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/Y1995/V31/I4/156 1UhligHH．JElecSci,1976;l23:16692RevieRW,UhligHH．ActaMetall,1974;22:6193SmialowskiM,KostanskingJ．CorrosSci,1979;19:10194谷 飚,褚武扬,乔利杰,肖纪美．金属学报,1994;30:A2325黄彦良,曹楚南,林海潮．金属学报,1993;29:B2126魏学军,周向阳,柯伟．金属学报,1993,29:B2697黄一中,陈奇志,褚武扬．金属学报,1994,30:4528褚武扬,氢损伤与滞后断裂．北京:冶金工业出版社,1988:3619 SieradzkiK,NewmanRC．PhilMagA．1985;51:9510 GalveleJ R．CorrosSci,1987:27:111JonesDA．MetallTrans,1985:16A:113312MagninT,ChieragattiR,OltraR．ActaMetallMater,1990;38:131313KanfmanMJ,FinkJI．Actametall,1985;36:221314 陈奇志,褚武扬,肖纪美．中国科学,1994;24A:29115谷飚,褚武扬,肖纪美．金属学报,1994;30:36216张跃,褚武场,肖纪美．中国科学,1994;24A:55117高克玮,褚武扬,肖纪美．中国科学,1994;24A:99318HirthJP．TheoryofDislocation,2ndeds．JohnWileyandSonsInc,1982:61919ParkinsRN,RangelCM,YuJ．MetallTrans,1985;16A:1671 20BertocciU．EmbrittlementbytheLocalizedCrackEnvironment,AIME,Warrendle,1984:49T [1] Maocheng YAN,Shuang YANG,Jin XU,Cheng SUN,Tangqing WU,Changkun YU,Wei KE. 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