INFLUENCE OF PHYSICAL DAMAGE EFFECT OF PSB ON CRACK INITIATION IN Al SINGLE CRYSTAL

Acta Metall Sin

1991, Vol. 27

Issue (1): 32-38 DOI:

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INFLUENCE OF PHYSICAL DAMAGE EFFECT OF PSB ON CRACK INITIATION IN Al SINGLE CRYSTAL

ZHAI Tongguang;LIN Shi;PAN Hu;XIAO Jimei University of Science and Technology Beijing

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ZHAI Tongguang;LIN Shi;PAN Hu;XIAO Jimei University of Science and Technology Beijing. INFLUENCE OF PHYSICAL DAMAGE EFFECT OF PSB ON CRACK INITIATION IN Al SINGLE CRYSTAL. Acta Metall Sin, 1991, 27(1): 32-38.

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Abstract An investigation was made of the crack initiation by cyclic deforma-tion on the two special surfaces of pure Al single crystal. One is the tOp-surfaeccontaining the active Burger's vector, and the other is the top-surface formingthe smallest angle with the active Burger's vector. The fatigue test were performedat the constant resolved shear stress amplitude (5 Pa), zero mean stress. Expe-rimentel results show that many microcracks are initiated on the side-surface onwhich no PSB surface topographies are formed during cyclic deformation. Cracks onthe side-surface are short with mean length of about 10 μm and distributed appro-ximately in a similar direction, perpendicular to the active Burger's vector, whereason the top-surface cracks are not as obvious as those on the side-surface. Observa-tions by scanning acoustic microscopy show that the fatigue damage on the side-surface is much deeper than that on the top-surface. A model of crack nucleationby voiding, and of PSB formation is suggested.

Key words: fatigue damage single crystal crack initiation persistent slip band acoustic microscope

Received: 18 January 1991

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1991/V27/I1/32

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