Effect of Mg- and Si-content on Microstructure and Mechanical Properties of a New High Strength Al-Mg-Si-Cu Alloy Prepared by Low Frequency Electromagnetic Casting

doi:10.11901/1005.3093.2016.711

Chinese Journal of Materials Research

2017, Vol. 31

Issue (10): 781-788 DOI: 10.11901/1005.3093.2016.711

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Effect of Mg- and Si-content on Microstructure and Mechanical Properties of a New High Strength Al-Mg-Si-Cu Alloy Prepared by Low Frequency Electromagnetic Casting

Yi MENG¹(

), Jianzhong CUI², Zhihao ZHAO², Yuanzhi ZHU¹

1 School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China
2 Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

Cite this article:

Yi MENG, Jianzhong CUI, Zhihao ZHAO, Yuanzhi ZHU. Effect of Mg- and Si-content on Microstructure and Mechanical Properties of a New High Strength Al-Mg-Si-Cu Alloy Prepared by Low Frequency Electromagnetic Casting. Chinese Journal of Materials Research, 2017, 31(10): 781-788.

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Abstract

The microstructure and mechanical properties of a new high strength Al-Mg-Si-Cu alloy prepared by low frequency electromagnetic casting (LFEC) alloy were studied by using optical microscope, energy dispersive spectroscopy (EDS), DSC analysis, JMat Pro 5.0 software and mechanical tests at room temperature. The results show that the temperatures of homogenization and solid solution for the alloy can be identified as 540℃ and 550℃ respectively. Mg₂Si phase could refine the as-cast grain size obviously and its effect on the as-cast grain refinement increases with the increase of Mg₂Si content in the alloy. While, the refining effect of Mg₂Si and other grain refiners on the grain sizes of ingots will be reduced by the excess of Mg or Si. However, the excess of Mg content in the alloy increases the elongation to more than 19% without reducing its strength. With the addition of 1.60% (mass fraction) Mg and 1.15% (mass fraction) Si to the Al-Mg-Si-Cu alloy exihibits higher strength (ultimate tensile strength 419 MPa and yield strength 362 MPa respectively) with undiminished ductility (elongation 18.75%).

Key words: metallic materials strength and ductility high strength aluminum alloy microstructure

Received: 08 October 2016

ZTFLH:

TG146.2

Fund: Supported by Training Program Foundation for the Talents by Beijing (No.2015000020124G023), Young Teacher Training Program of North China University of Technology (No.XN072-017), the Scientific Research Fundation Project of North China University of Technology (No.1100000156041-2015)

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	Yi MENG
	Jianzhong CUI
	Zhihao ZHAO
	Yuanzhi ZHU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.711 OR https://www.cjmr.org/EN/Y2017/V31/I10/781

Table 1 Chemical composition of alloys A~E (%, mass fraction)

Table 2 Parameters of casting processes

Fig.1 Calculation results of alloys A~E by JMat Pro 5.0 software respectively (a) alloy A, (b) alloy B, (c) alloy C, (d) alloy D, (e) alloy E

Fig.2 DSC analysis of ingots of alloy E before homogenization treatment

Fig.3 SEM image and EDS analysis results of as-cast alloy E: (a) SEM image; (b, c, d) EDS analysis results of phases 1#, 2# and 3# in image Fig.a respectively

Fig.4 Microstructures of as-cast alloys A~E (center) by polarized light (a) alloy A, (b) alloy B, (c) alloy C, (d) alloy D, (e) alloy E

Fig.5 Mean grain size of as-cast alloys A~E obtained from Fig.4

Fig.6 Microstructures of as-extruded alloys A~E in longitudinal direction (with etched) (a) alloy A, (b) alloy B, (c) alloy C, (d) alloy D, (e) alloy E

Fig.7 Microstructures of alloys A~E after T6 treatment in longitudinal direction (with etched): (a) alloy A, (b) alloy B, (c) alloy C, (d) alloy D, (e) alloy E

Fig.8 Mechanical properties of as-extruded and T6 alloys A~E: (a) as-extruded, (b) T6

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