GROWTH BEHAVIOR OF FATIGUE CRACK IN SPRAY-FORMED SiCp/Al-7Si COMPOSITE

doi:10.3724/SP.J.1037.2010.00315

Acta Metall Sin

2011, Vol. 47

Issue (1): 102-108 DOI: 10.3724/SP.J.1037.2010.00315

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GROWTH BEHAVIOR OF FATIGUE CRACK IN SPRAY-FORMED SiC_p/Al-7Si COMPOSITE

LI Wei, CHEN Zhenhua, CHEN Ding, TENG Jie

College of Materials Science and Engineering, Hunan University, Changsha 410082

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LI Wei CHEN Zhenhua CHEN Ding TENG Jie. GROWTH BEHAVIOR OF FATIGUE CRACK IN SPRAY-FORMED SiC_p/Al-7Si COMPOSITE. Acta Metall Sin, 2011, 47(1): 102-108.

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Abstract In order to investigate the fatigue crack growth behaviors of SiC_p/Al-7Si composite and the unreinforced alloy prepared by spray deposition, compact tension (CT) specimens were prepared and tension-tension fatigue tests were carried out under constant-amplitude load and load shedding technique (ΔK-decreasing) control to obtain the fatigue threshold. The experimental data demonstrate that the addition of SiC particles results in superior fatigue crack propagation properties for a given ΔK, i.e. lower crack growth rate and higher intrinsic threshold stress intensity factor. The SiC particles play a significant role in dictating the rate of fatigue crack growth. OM and SEM observations show that crack deflections around SiC particles and particle cracking are the principle mechanisms of interaction between SiC particles and crack tip. Moreover, detailed quantitative analysis indicates that the extent of particle cracking induces a high level of fatigue crack closure, which effectively reduces the driving force of crack growth and so slows down fatigue crack growth. However, when the closure-corrected effective stress intensity factor range (ΔK_eff) acts as the crack driving force, the composite shows a higher crack growth behavior than the unreinforced alloy.

Key words: Al-Si alloy SiC particle composite spray deposition fatigue crack growth crack closure

Received: 30 June 2010

ZTFLH:

TG111

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Supported by National Natural Science Foundation of China (No.50875225) and International Cooperation of Hunan province in China (No.2007WK2005)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00315 OR https://www.ams.org.cn/EN/Y2011/V47/I1/102

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