Investigation of Rotary Bending Gigacycle Fatigue Properties of Al–7Si–0.3Mg Alloys

Chin J Mater Res

2012, Vol. 26

Issue (3): 284-288 DOI:

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Investigation of Rotary Bending Gigacycle Fatigue Properties of Al–7Si–0.3Mg Alloys

LIU Yongqin, JIE Wanqi, WANG Shanna, LUO Haijun

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072

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LIU Yongqin JIE Wanqi WANG Shanna LUO Haijun. Investigation of Rotary Bending Gigacycle Fatigue Properties of Al–7Si–0.3Mg Alloys. Chin J Mater Res, 2012, 26(3): 284-288.

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Abstract Rotary bending gigacycle fatigue properties of Al–7Si–0.3Mg alloys were investigated, and the S–N curve and critical stress 88 MPa under fatigue life of 107 cycs were obtained. The results of fracture analysis show that the fatigue fracture mainly occurred at surface flaws or defects in the region of high stress amplitude level, whereas the fatigue fracture mainly occurred at a subsurface porosity in the region of low stress amplitude level. The quantitive relationship between porosity diameter and fatigue life was established and the critical size of porosity on different stress was obtained by using the formula Paris.

Key words: metallic materials Al–7Si–0.3Mg alloy rotary bending gigacycle fatigue S–N curve porosity

Received: 23 March 2012

ZTFLH:

TG113

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Supported by National Key Basic Research and Development Program of China No.2011CB610403.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2012/V26/I3/284

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