FATIGUE CRACKING IN Ni3Al SINGLE CRYSTAL UNDER CYCLIC COMPRESSIVE LOAD
ZHANG Guangping; WANG Zhongguang; LI Guangyi (State Key laboratory for Fracture and Fatigue of Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)
Cite this article:
ZHANG Guangping; WANG Zhongguang; LI Guangyi (State Key laboratory for Fracture and Fatigue of Materials; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015). FATIGUE CRACKING IN Ni3Al SINGLE CRYSTAL UNDER CYCLIC COMPRESSIVE LOAD. Acta Metall Sin, 1996, 32(11): 1149-1153.
Abstract Fatigue cracking in Ni3Al single crystals with two kinds of orientation was examined by means of single-edge notch specimens under cyclic compression. Stage I cracking along two or more {111} planes can occur from the notch root simultaneously. There exists an orientation dependence of the crack initiation threshold under cyclic compression. The cleavage chunk falling off from the specimen surface due to the intersection of different {111} planes was observed in (100)[010] specimen, but never observed in (110)[110] specimen. Subsequently, the mechanism of crack growth which is dependent on orientation was proposed in this paper. Correspondent: ZHANG Guangping, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015
HU Yunming;WANG Zhongguang(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academyof Sciences; Shenyang 110015)Correspondent; HU Yunming; Tel: (024)23843531-55gg5; Fax: (024)23891s20Manuscript received 1997-12-17; in revised form 1998-01-30. CYCLIC DEFORMATION BEHMIOR AND FATIGUE CRACK INITIATION IN COPPER BICRVSTALS[J]. 金属学报, 1998, 34(12): 1255-1260.
