Acta Metall Sin  1997, Vol. 33 Issue (10): 1015-1020    DOI:

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FATIGUE DAMAGE AND CRACK INITIATION IN [112] ALUMINUM SINGLE CRYSTAL

WANG Mingzhang; LIN Shi; LI Jinxu; GUAN Jingjiao; XIAO Jimei (University of Science and Technology Beijing; Beijing 100083)

WANG Mingzhang; LIN Shi; LI Jinxu; GUAN Jingjiao; XIAO Jimei (University of Science and Technology Beijing; Beijing 100083). FATIGUE DAMAGE AND CRACK INITIATION IN [112] ALUMINUM SINGLE CRYSTAL. Acta Metall Sin, 1997, 33(10): 1015-1020.

Abstract References Related Articles Recommended Metrics Download:  PDF(3252KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The [112]aluminum single crystal was tested in full push-pull at room temperature in air, with specific stress amplitudes and frequence of 15 Hz. Detailed observations were made on side-surface which contained Burgers vectors of two primary slip systems and front-surface. On front-surface typical PSBs topographies and crack initiation along PSBs have been seen. However, on side-surface where PSBs were invisible, a more complicated deformation appearance was developed, and microcracks initiated along extrusions or intrusions which were formed without a definite crystallographic relation to PSBs' The results show again that, without the aid of the surface roughness of PSBs, cracks can still be nucleated, and that the accumulative structural damage in single crystal aluminum is believed to be one of basic factors controlling crack initiation. Yet it was shown that the deformation and damage processes in single crystal aluminum are orientation dependent, and that the marked cross-slip in poly-slip crystals could accelerate the damage process which can be manifested best on side-surface. Key words:  fatigue damage      crack initiation      single crystal      crystallographic orientation      Received:  18 October 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/I10/1015 1 Suresh S著,王中光等译.材料的疲劳.北京:国防工业出版社, 1993 2翟同广,林实,潘祜,肖纪美,金属学报,1991;27:a32 3 Zhai T,Martin J W,Briggs G a D.acta Metall Mater,1995;43:3813 4 Zhai T, Martin J W, Briggs G a D. acta Mater,1996;44:1729 5 Jin N Y, Winter a T.acta Metall,1984; 32:989 6 Vorren O, Ryum N. acta Metall,1988; 36:1443 7 Vorren O,Ryum N. acta Metal,1987,35:855K [1] ZHAO Peng, XIE Guang, DUAN Huichao, ZHANG Jian, DU Kui. 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