Dynamic Aging Behavior and Mechanical Properties of an Al-Mg-Si Aluminium Alloy Induced by Equal Channel Angular Pressing

doi:10.11901/1005.3093.2016.105

Chinese Journal of Materials Research

2016, Vol. 30

Issue (10): 721-730 DOI: 10.11901/1005.3093.2016.105

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Dynamic Aging Behavior and Mechanical Properties of an Al-Mg-Si Aluminium Alloy Induced by Equal Channel Angular Pressing

Manping LIU^1,^**(

),Jiangtao WEI¹,Yichao LI¹,Jiawei JIANG¹,Kui JIANG¹,J. Roven Hans²

1. Jiangsu Province Key Laboratory of High-end Structural Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
2. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway

Cite this article:

Manping LIU,Jiangtao WEI,Yichao LI,Jiawei JIANG,Kui JIANG,J. Roven Hans. Dynamic Aging Behavior and Mechanical Properties of an Al-Mg-Si Aluminium Alloy Induced by Equal Channel Angular Pressing. Chinese Journal of Materials Research, 2016, 30(10): 721-730.

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Abstract

In this paper, dynamic aging behavior and mechanical properties of an Al-Mg-Si alloy were investigated by means of X-ray diffractometer (XRD), differential scanning calorimetry (DSC) analysis, transmission electron microscope (TEM) and tensile test. The dynamic aging was performed on the solution-treated alloy through equal channel angular pressing (ECAP) at different temperatures. The DSC analyses reveal that dynamic aging in the alloys occurred during ECAP. The XRD, DSC analyses and TEM observation reveal that a considerable amount of dislocations and β″ precipitates had already existed during dynamic aging. Combination of high ductility (uniform elongation large than 10%) and high strength was obtained for the ECAPed alloys. The highest ultimate tensile strength and yield strength of the ECAPed alloys are 450 MPa and 425 MPa, respectively. The very high strength and good ductility of the ECAPed alloy can be attributed to the synergistic interaction of the fine β'' precipitates and the high densities of dislocations after ECAP.

Key words: metallic materials equal-channel angular pressing severe plastic deformation Al-Mg-Si aluminum alloy dynamic aging behavior mechanical properties strength-ductility

Received: 26 February 2016

Fund: *Supported by National Natural Science Foundation of China No.50971087, Key University Science Research Project of Jiangsu Province No.14KJA430002, and Jiangsu Province Key Laboratory of High-end Structural Materials No.hsm1301.

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	Manping LIU
	Jiangtao WEI
	Yichao LI
	Jiawei JIANG
	Kui JIANG
	J. Roven Hans

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.105 OR https://www.cjmr.org/EN/Y2016/V30/I10/721

Table 1 Composition of the 6061 alloy (mass fraction, %)

Fig.1 Dimension of tensile specimens (unit: mm)

Fig.2 XRD spectra of the 6061 alloy in different conditions

Table 2 Microstructural parameters of the ECAP alloy determined by XRD analysis

Fig.3 DSC plots for the heat flow of precipitate reactions of 6061 Al alloy (a) SST; (b) ECAPed at RT; (c) ECAPed at 170℃; (d) ECAPed at 191℃

Table 3 Exothermic peak temperatures on DSC curves after solid-solution treatment and dynamic aging (℃)

Fig.4 TEM image of 6061 alloy ECAPed at 170℃: (a) TEM image; (b) histogram of grain size distribution

Fig.5 TEM images of 6061 alloy ECAPed at 170℃: (a) precipitates; (b) dislocation and precipitates

Fig.6 Engineering stress-stain curves of the 6061 alloy in different conditions

Table 4 Mechanical properties of the alloy

Fig.7 True stress-stain curves of the 6061 alloy

Table 5 Strength-ductility of 6061 alloys processed by various SPD methods

Fig.8 Comparison of normalized strain hardening rate (Θ) vs. true stain (?) of 6061 ECAP alloys and recent literatures^{[24, 28]}

Fig.9 Strength-ductility of 6000 series alloys processed by various SPD methods (a) yield strength vs. uniform elongation; (b) engineering stress vs. engineering strain

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