Influence of Modification, Refinement and Heat Treatment on Mechanical Properties of A356 Al-alloy Components Prepared by Squeeze Casting

doi:10.11901/1005.3093.2020.199

Chinese Journal of Materials Research

2020, Vol. 34

Issue (12): 881-891 DOI: 10.11901/1005.3093.2020.199

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Influence of Modification, Refinement and Heat Treatment on Mechanical Properties of A356 Al-alloy Components Prepared by Squeeze Casting

JIANG Jufu¹(

), WANG Ying², XIAO Guanfei¹, DENG Teng¹, LIU Yingze¹, ZHANG Ying¹

^1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
^2.School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China

Cite this article:

JIANG Jufu, WANG Ying, XIAO Guanfei, DENG Teng, LIU Yingze, ZHANG Ying. Influence of Modification, Refinement and Heat Treatment on Mechanical Properties of A356 Al-alloy Components Prepared by Squeeze Casting. Chinese Journal of Materials Research, 2020, 34(12): 881-891.

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Abstract

Influence of modification, refinement and heat treatment on the microstructure and mechanical properties of A356 Al-alloy components prepared by squeeze casting was investigated. The results show that with increase of Al-10Sr modification agent, the morphology of eutectic Si changed from lamellar, rod-like shape to granular and wormlike shape, and the grain size of α-Al increased first and then decreased. When 0.3% Al-10Sr modification agent was added, the optimal mechanical properties of squeeze casting components including ultimate tensile strength of 221.3 MPa, yield strength of 104.5 MPa and elongation of 10.3% were achieved. The improvement of mechanical properties can be attributed to the increase of nucleation rate, the decrease of α-Al grain size and the change of eutectic Si morphology by adding 0.3% Al-10Sr modification agent. With the increase of A-5Ti-B refiner, the α-Al grain size first decreased and then increased, but the changing trend of mechanical properties is inverse. When 0.6% Al-5Ti-B refiner was added, the optimal ultimate tensile strength, yield strength and elongation were 215.6 MPa, 106.6 MPa and 9.0%, respectively. T6 heat treatment including solid solution at 540℃ for 4 h and artificial aging at 190℃ for 4 h led to the improvement of yield strength and ultimate tensile strength, but it led to the decrease of elongation. The optimal mechanical properties such as yield strength of 239.3 MPa, ultimate tensile strength of 297.5 MPa and elongation of 8.0% were obtained for the squeeze casting component with T6 treatment and an addition of 0.6% A-5Ti-B refiner. The globularization of eutectic Si, the refinement of eutectic Si, the homogenization of composition for the prepared component and the precipitation of Mg₂Si phase in α-Al matrix all lead to the improvement of mechanical properties of squeeze casting component with T6 treatment.

Key words: synthesizing and processing technics for materials modification and refinement microstructure mechanical properties A356 aluminum alloy squeeze casting

Received: 29 May 2020

ZTFLH:

TG249.9

Fund: National Key Research and Development Program(2019YFB2006500);National Natural Science Foundation of China(51875124)

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	Jufu JIANG
	Ying WANG
	Guanfei XIAO
	Teng DENG
	Yingze LIU
	Ying ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2020.199 OR https://www.cjmr.org/EN/Y2020/V34/I12/881

Table 1 Experimental plan in this research

Fig.1 Three dimension model of squeeze casting component and locations of samples

Fig.2 Microstructure and average grain size of squeeze casting component with different addition quantity of Al-10Sr modifier (a) 0, (b) 0.1%, (c) 0.3%, (d) 3%, (e) 0 (1000x), (f) 0.3% (1000x), (g) average grain size

Fig.3 Mechanical properties of squeeze casting component with different addition quantity of Al-10Sr modifier

Fig.4 Microstructure and average grain size of squeeze casting component with different addition quantity of Al-5Ti-B refiner (a) 0.1%, (b) 0.6%, (c) 3%, (d) average size of grains

Fig.5 Mechanical properties of squeeze casting component with different quantity of Al-5Ti-B refiner

Fig.6 Engineering stress-strain curve of squeeze casting component before and after T6

Fig.7 Microstructure of squeeze casting component with T6 (a) No.8 sample, (b) No.9 sample, (c) No.10 sample

Fig.8 SEM image and EDS of squeeze casting component with 3% addition of Al-10Sr modifier (a) SEM image with scanning line, (b) line scanning of Sr element

Fig.9 SEM image and point scanning EDS of squeeze casting component with 3% addition of Al-10Sr modifier (a) SEM image, (b) point A scanning EDS

Fig.10 Fracture morphology of squeeze casting component (a) low-resolution sample 9, (b) high-resolution sample 9, (c) low-resolution sample 10, (d) high-resolution sample 10

Fig.11 TEM image (a) and EDS mapping images (b) Al, (c) Si, (d) Mn, (e) Mg, (f) Fe

Fig.12 TEM image and selected area electron diffraction (SAED) (a) TEM dark field image, (b) SAED

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