INFLUENCE OF HEAT TREATMENT ON LOW-CYCLE FATIGUE BEHAVIOR OF EXTRUDED Mg-7%Zn-0.6%Zr-0.5%Y ALLOY

doi:10.3724/SP.J.1037.2013.00781

Acta Metall Sin

2014, Vol. 50

Issue (6): 700-706 DOI: 10.3724/SP.J.1037.2013.00781

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INFLUENCE OF HEAT TREATMENT ON LOW-CYCLE FATIGUE BEHAVIOR OF EXTRUDED Mg-7%Zn-0.6%Zr-0.5%Y ALLOY

ZHANG Siqian¹(

), WU Wei¹, CHEN Lili², CHE Xin¹, CHEN Lijia¹

1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870
2 Shenyang Aerosun-Futai Expansion Joint Co. Ltd, Shenyang 110141

Cite this article:

ZHANG Siqian, WU Wei, CHEN Lili, CHE Xin, CHEN Lijia. INFLUENCE OF HEAT TREATMENT ON LOW-CYCLE FATIGUE BEHAVIOR OF EXTRUDED Mg-7%Zn-0.6%Zr-0.5%Y ALLOY. Acta Metall Sin, 2014, 50(6): 700-706.

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Abstract

The low-cycle fatigue tests have been conducted for the Mg-7%Zn-0.6%Zr-0.5%Y alloys (mass fraction) subjected to extrusion, aging (T5) and solution plus aging (T6) treatment, respectively. The influence of heat treatment on the fatigue deformation behavior of the alloy has also been systematically investigated. The results show that T5 and T6 treatment can improve the cyclic deformation resistance of Mg-7%Zn-0.6%Zr-0.5%Y alloys. T5 treatment can reduce the fatigue life of the alloy. However, T6 treatment can improve the fatigue life at high total strain amplitudes, and reduce the fatigue life at low total strain amplitudes. The relationship between elastic strain amplitude, plastic strain amplitude and reversals to failure of the alloys can be described by Basquin and Coffin-Manson equations, respectively. For the alloys subjected to both T5 and T6 treatments, the increase in the cyclic deformation resistance is mainly due to the formation of long period stacking ordered (LPSO) phase. The twins formed during the fatigue deformation may be responsible for the decrease in the fatigue life of the alloy subjected to T5 treatment.

Key words: magnesium alloy low-cycle fatigue cyclic deformation heat treatment

Received: 02 December 2013

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	Siqian ZHANG
	Wei WU
	Lili CHEN
	Xin CHE
	Lijia CHEN

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00781 OR https://www.ams.org.cn/EN/Y2014/V50/I6/700

Fig.1 Cyclic stress amplitudes of Mg-7%Zn-0.6%Zr-0.5%Y alloys with different states at strain amplitudes (De_t/2) of 0.3% (a), 0.45% (b), 0.6% (c), 0.8% (d) and 1.0% (e)

Fig.2 Total strain amplitude versus fatigue life curves of Mg-7%Zn-0.6%Zr -0.5%Y alloys with different states

Fig.3 Elastic (a) and plastic (b) strain amplitudes versus reversals to failure curves for Mg-7%Zn-0.6%Zr-0.5%Y alloys

Fig.4 Cyclic stress-strain curves for Mg-7%Zn-0.6%Zr-0.5%Y alloys

Table 1 Strain fatigue parameters of Mg-7%Zn-0.6%Zr-0.5%Y alloys with different states

Fig.5 Fig.5 Microstructures of Mg-7%Zn-0.6%Zr-0.5%Y alloys with different states (Insets show the corresponding SAED patterns of the I phase, long period stacking ordered (LPSO) phase and twins in the alloy)

(a) I phase in the as-extruded alloy with De_t/2=0.6%

(b) dislocation in the as-extruded alloy with De_t/2=0.6%

(d) twins in the T5 state alloy with De_t/2=1.0%

(e) I phase in the T6 state alloy with De_t/2=1.0%

(f) LPSO phase in the T6 state alloy with De_t/2=1.0%

(g) HRTEM image show the LPSO phase in the T6 state alloy with De_t/2=1.0%

Fig.6 TEM images to show the dislocation between the LPSO phase (a), and kinking of the LPSO phase in the T5 state (b) with Dε_t/2=1.0%

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