Acta Metall Sin  1994, Vol. 30 Issue (9): 416-421    DOI:

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INFLUENCE OF LAMELLAR STRUCTURE ON CRACK PROPAGATION IN DUPLEX TiAl ALLOY

CHEN Mingwei; LIN Dongliang; CHEN Da(Shanghai Jiaotong University); SHI Jiandong; ZOU Dunxu; ZHONG Zengyong(Central Iron and Steel Reaserch Institute; Ministry of Metallurgical industry; Beijing)(Manuscript received 23 January;1994)

CHEN Mingwei; LIN Dongliang; CHEN Da(Shanghai Jiaotong University); SHI Jiandong; ZOU Dunxu; ZHONG Zengyong(Central Iron and Steel Reaserch Institute; Ministry of Metallurgical industry; Beijing)(Manuscript received 23 January;1994). INFLUENCE OF LAMELLAR STRUCTURE ON CRACK PROPAGATION IN DUPLEX TiAl ALLOY. Acta Metall Sin, 1994, 30(9): 416-421.

Abstract References Related Articles Recommended Metrics Download:  PDF(487KB)  Export:  BibTeX | EndNote (RIS)       Abstract  In situ TEM technique was employed to observe the influence of lamellar structure on the crack propagation in duplex TiAl alloy. It has been found that both crack tip blunting and crack propagating have connected with the angle included between crack growth and lamellar direction. Only if the crack growth roughly parallel to lamellar direction ,the microcracks may nucleate ahead of the main crack. So, shear ligaments play an important role in toughening TiAl alloy. When the crack growth is perpendicular to lamellae or between perpendicular and parallel to lamellae, the main reasons of lamellar toughening in TiAl alloy owe to that:(1) the lamellar boundary inhibits crack propagation,and(2)the crack tip blunting is caused by the slip of interlamellar boundary. According to the dislocations theory of microcrack nucleation, these phenomena are explained.Correspondent: LIN Dongliang, professor,(Shanghai Jiaotong University, Shanghai 200030) Key words:  TiAl      intermetallic compound      lamellar structure      crack propagation      Stroh's model      Received:  18 September 1994      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/Y1994/V30/I9/416 1KimYW．In:IzumiOed．,IntermetallicCompound,JapanInstitueofMetals,Japan,Sendai,1991:7532KimYW．In:StieglerJO,JohnsonAL,PopeDPeds．,HighTemperatureOrderIntermetallicAlloy．MRS,Pittsburgh,PA,1991:7773ChanKS．MetallTrans,1991;22A:20214ChanKS,KimYW．MetallTrans,1992;23A:16635ChanKS,KimYW．MetallTrans,1993;24A:1136ChanKS．MetallTrans,1993;24A:5697DavidsonDL,CampbellJB．MetallTrans,1993;24A:15558AppelF,BeavenPA,WagnerR．ActaMetallMater,1993;41:17219ZhaoL,TangriK．ActaMetallMater．1991;39:220910ZhaoL,TangriK．PhilosMag,1991;64A:36111ZhaoL,TangriK．PhitosMag,1992;65A:106512FujiwaraT,NakamuraA,HosomiM,NishitaniSR,ShiraiY,YamaguchiMPhilosMag,1990;61A:59113InuiH,OhMH,NakamuraA,YamaguchiM．ActaMetallMater．1992:40:309514InuiH,NakamuraA,ohMH,YamaguchiM．PhilosMag．1992;66A:55715StrohAN,AdvPys,1957;6:41816SmithE,BarnbyJT．JMetSci,1967;1:5617VarinRA,WinnickaMB.ScrMetallMater,1993;28:1718LipsittHA,ShechtmanD,SchafrikRE．MetallTrans,1975;6A:199119LipsittHA．MaterResSocSympProc,1985;39:35120YooMH,FuCL．,DaraliaR,LewandonwskiJJ,LiuCTetal．StructuralIntermetallics,TMS,1993:283v [1] JIANG He, NAI Qiliang, XU Chao, ZHAO Xiao, YAO Zhihao, DONG Jianxin. 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