Property of Al-Zn-Mg-(Cu) Alloy after Linear Heating Aging Treatment

doi:10.11901/1005.3093.2014.494

Chinese Journal of Materials Research

2015, Vol. 29

Issue (3): 235-240 DOI: 10.11901/1005.3093.2014.494

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Property of Al-Zn-Mg-(Cu) Alloy after Linear Heating Aging Treatment

Miaoxia ZENG,Zhenming LIN,Wentao LI,Man JIN(

)

School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

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Miaoxia ZENG,Zhenming LIN,Wentao LI,Man JIN. Property of Al-Zn-Mg-(Cu) Alloy after Linear Heating Aging Treatment. Chinese Journal of Materials Research, 2015, 29(3): 235-240.

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Abstract

Effect of linear heating aging process and the Cu content on the performance and the formation of precipitates of Al-Zn-Mg-(Cu) alloy was investigated by means of differential scanning calorimeter (DSC), hardness tester, transmission electron microscopy(TEM) and three-dimensional atom probe (3DAP). The results show that with the increase of the aging temperature the hardness rises firstly and then decreases after reaching a peak. After aging at every selected temperature of the linear heating aging treatment process, all the relevant hardness of the Al-Zn-Mg-Cu alloy is higher than that of the Al-Zn-Mg alloy. After aging at peak point by linear heating, the main precipitates are η' phase, while there exists small quantities of η phase and GP zone for the two alloys Al-Zn-Mg and Al-Zn-Mg-Cu. However the addition of Cu may induces certain change of the composition and morphology of the precipitates and delay their transition from metastable state to stable state.

Key words: metallic materials Al-Zn-Mg-(Cu) alloy linear heating aging process precipitate

Received: 12 September 2014

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	Miaoxia ZENG
	Zhenming LIN
	Wentao LI
	Man JIN

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.494 OR https://www.cjmr.org/EN/Y2015/V29/I3/235

Table 1 Chemical compositions of alloys (%, mass fraction)

Fig.1 DSC curves of as-solution treated and quenched alloy (scanning speed 10k/min)

Fig.2 Hardness of Al-Zn-Mg-(Cu) alloy during linear heating aging at rate of 20℃/h

Fig.3 TEM images of Al-Zn-Mg alloy after linear heating to 180℃ aging (a) TEM image; (b) HRTEM image

Fig.4 TEM images of Al-Zn-Mg-Cu alloy after linear heating to 190℃ aging. (a) TEM image; (b) HRTEM image

Fig.5 After linear heating to 180℃ aging, 3DAP image of the overall morphology (a) and segregation of Mg clusters (b) and Zn clusters (c) of Al-Zn-Mg alloy (80 nm×20 nm×20 nm)

Fig.6 After linear heating to 180℃, 3DAP image of the overall morphology and elements segregation of Al-Zn-Mg-Cu alloy (a) the overall morphology; (b) 3DAP image of Mgclusters; (c) 3DAP image of Znclusters; (d) 3DAP image of Cu clusters (80×30×30 nm)

Table 2 Shape, size and composition of two alloys through linear heating aging treatment

Fig.7 Enlarged spherical clusters (8 nm×10 nm×9 nm) (a) and composition-distance image (b) of Al-Zn-Mg alloy

Fig.8 Enlarged rod-like cluster (a) and composition-distance image (b) of Al-Zn-Mg alloy

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