Low-cycle Fatigue Behavior of Al-5.4Zn-2.6Mg-1.4Cu Alloy Sheet

doi:10.11901/1005.3093.2020.020

Chinese Journal of Materials Research

2020, Vol. 34

Issue (9): 697-704 DOI: 10.11901/1005.3093.2020.020

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Low-cycle Fatigue Behavior of Al-5.4Zn-2.6Mg-1.4Cu Alloy Sheet

WANG Guanyi, CHE Xin(

), ZHANG Haoyu, CHEN Lijia

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China

Cite this article:

WANG Guanyi, CHE Xin, ZHANG Haoyu, CHEN Lijia. Low-cycle Fatigue Behavior of Al-5.4Zn-2.6Mg-1.4Cu Alloy Sheet. Chinese Journal of Materials Research, 2020, 34(9): 697-704.

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Abstract

Low-cycle fatigue behavior for two type of specimens, sampling along rolling direction (RD) and transvers direction (TD) respectively of the rolled sheet of Al-5.4Zn-2.6Mg-1.4Cu alloy was comparatively assessed at room temperature. The results show that for all imposed total strain amplitudes the alloy along both RD and TD directions exhibits the stable cyclic stress response behavior. The cyclic stress amplitude of the alloy along TD direction is higher than that along RD direction for the same total strain amplitude, while the fatigue life of the alloy along RD direction is significantly longer than that along TD direction. For the Al-5.4Zn-2.6Mg-1.4Cu alloy sheet, the plastic strain amplitude and elastic strain amplitude are linearly related to the number of reversals to failure. In addition, under the loading condition of low-cycle fatigue the fatigue cracks initiate transgranularly at the free surface of fatigue samples and propagate transgranularly.

Key words: materials failure and protection low-cycle fatigue Al-5.4Zn-2.6Mg-1.4Cu alloy rolled sheet fatigue crack initiation and propagation

Received: 15 January 2020

ZTFLH:

TG146.2+1

Fund: Foundation of State Key Laboratory of Rolling and Automation, Northeastern University(2018RALKFKT010)

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	Guanyi WANG
	Xin CHE
	Haoyu ZHANG
	Lijia CHEN

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.020 OR https://www.cjmr.org/EN/Y2020/V34/I9/697

Fig.1 Schematic diagram for sampling mode in RD and TD direction

Fig.2 Stress-strain curve of Al-5.4Zn-2.6Mg-1.4Cu alloy (a) RD direction; (b) TD direction

Fig.3 Cyclic stress response curves of Al-5.4Zn-2.6Mg-1.4Cu alloy with RD and TD direction at various total strain amplitudes (a) 0.4%; (b) 0.5%; (c) 0.6%; (d) 0.7%; (e) 0.8%

Fig.4 Cyclic stress-strain curves of Al-5.4Zn-2.6Mg-1.4Cu alloy

Table 1 Strain fatigue parameters of Al-5.4Zn-2.6Mg-1.4Cu alloy with RD and TD direction

Fig.5 Total strain amplitude versus fatigue life for Al-5.4Zn-2.6Mg-1.4Cu alloy

Fig.6 Strain amplitudes versus reversals to failure curves for Al-5.4Zn-2.6Mg-1.4Cu alloy (a) RD direction; (b) TD direction

Fig.7 Photographs of fatigue crack initiation and fatigue crack propagation regions of Al-5.4Zn-2.6Mg-1.4Cu alloy (a) fatigue crack initiation region, RD direction; (b) fatigue crack initiation region, TD direction; (c) fatigue crack propagation region, RD direction; (d) fatigue crack propagation region, TD direction

Fig.8 TEM analysis results for fatigue deformation zone of Al-5.4Zn-2.6Mg-1.4Cu alloy with different rolling direction (a) RD direction; (b) TD direction; (c) SAED

Fig.9 EBSD images, PF and IPF of Al-5.4Zn-2.6Mg-1.4Cu alloy (a) RD direction; (b) TD direction; (c) PF; (d) IPF

Table 2 Maximum stress range of RD and TD Al-5.4Zn-2.6Mg-1.4Cu alloy

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