Microstructure and mechanical properties of Al-Mg-Si alloy fabricated by a short process based on sub-rapid solidification

doi:10.1016/j.jmst.2019.08.053

J. Mater. Sci. Technol.

2020, Vol. 41

Issue (0): 178-186 DOI: 10.1016/j.jmst.2019.08.053

Research Article

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Microstructure and mechanical properties of Al-Mg-Si alloy fabricated by a short process based on sub-rapid solidification

Ze-Tian Liu^a^b, Bing-Yu Wang^b, Cheng Wang^a^b^c^*(

), Min Zha^a^b^c, Guo-Jun Liu^b, Zhi-Zheng Yang^b, Jin-Guo Wang^b, Jie-Hua Li^d, Hui-Yuan Wang^a^b^c^*(

)

^aState Key Laboratory of Super Hard Materials, Jilin University, Changchun 130012, China
^bKey Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
^cInternational Center of Future Science, Jilin University, Changchun 130012, China
^dInstitute of Casting Research, Montanuniversität Leoben, Leoben, A-8700, Austria

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Abstract

Al-Mg-Si (AA6xxx) series alloys have been used widely in automotive industry for lightweight purpose. This work focuses on developing a short process for manufacturing Al-0.5Mg-1.3Si (wt.%) alloy sheets with good mechanical properties. Hereinto, a preparation route without homogenization was proposed on the basis of sub-rapid solidification (SRS) technique. The sample under SRS has fine microstructure and higher average partition coefficients of solute atoms, leading to weaker microsegregation owing to the higher cooling rate (160 °C/s) than conventional solidification (CS, 30 °C/s). Besides, Mg atoms tend to be trapped in Al matrix under SRS, inducing suppression of Mg₂Si, and promoting generation of AlFeSi phase. After being solution heat treated (T4 state), samples following the SRS route have lower yield strength compared with that by CS route, indicating better formability in SRS sample. After undergoing pre-strain and artificial aging (T6 state), the SRS samples have comparable yield strength to CS samples, satisfying the service requirements. This work provides technological support to industrially manufacture high performance AA6xxx series alloys with competitive advantage by a novel, short and low-cost process, and open a door for the further development of twin-roll casting based on SRS technique in industries.

Key words: Al-Mg-Si alloy Sub-rapid solidification Microstructure Mechanical properties Short process

Received: 28 May 2019

Corresponding Authors: Wang Cheng,Wang Hui-Yuan E-mail: chengwang@jlu.edu.cn;wanghuiyuan@jlu.edu.cn

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	Liu Ze-Tian
	Wang Bing-Yu
	Wang Cheng
	Zha Min
	Liu Guo-Jun
	Yang Zhi-Zheng
	Wang Jin-Guo
	Li Jie-Hua
	Wang Hui-Yuan

Cite this article:

Ze-Tian Liu, Bing-Yu Wang, Cheng Wang, Min Zha, Guo-Jun Liu, Zhi-Zheng Yang, Jin-Guo Wang, Jie-Hua Li, Hui-Yuan Wang. Microstructure and mechanical properties of Al-Mg-Si alloy fabricated by a short process based on sub-rapid solidification. J. Mater. Sci. Technol., 2020, 41(0): 178-186.

URL:

https://www.jmst.org/EN/10.1016/j.jmst.2019.08.053 OR https://www.jmst.org/EN/Y2020/V41/I0/178

Fig. 1. Schematic diagram for the three different fabrication processes.

Fig. 2. (a) Schematic diagram of temperature measuring system; (b) entire cooling curves of SRS and CS samples; (c) detail of initial stage on SRS cooling curve; (d) detail of initial stage on CS cooling curve.

Fig. 3. Optical micrograph (OM) of (a) as-cast SRS sample, (b) as-cast CS sample and (c) as-homogenized CS sample.

Fig. 4. Backscattered electron imaging (BSE) micrographs observed in as-cast samples of (a) SRS and (b) CS; (line 1), (line 2) corresponds to the composition distribution profiles of Fe, Mg, Si in (a) and (b), respectively.

Table 1 Average partition coefficients of Mg, Si, Fe elements under SRS and CS processes.

Fig. 5. OM micrographs of cold-rolled (a) SRS and (b) as-homogenized CS samples.

Fig. 6. (a) and (c) EBSD inverse pole figure (IPF) maps of SRS-T4 and CS-T4; (b) and (d) correspond to grain size histogram of (a) and (c).

Fig. 7. TEM micrographs and corresponding selected area electron diffraction (SAED) patterns obtained from the given particles: (a) SRS-T4, (b) CS-T4; TEM micrographs and high resolution TEM images (HRTEM) of the given particles: (c) SRS-T6 and (d) CS-T6.

Fig. 8. Typical EBSD inverse pole figure maps of (a) SRS-T6 and (c) CS-T6; (b) and (d) corresponding misorientation profiles measured along the lines in (a) and (c).

Fig. 9. Typical tensile engineering stress-strain curves of SRS, CS and CSN samples at (a) T4 and (b) T6 states.

Table 2 Mechanical properties of SRS, CS and CSN samples at T4 and T6 states along with those of commercial alloys in other literatures.

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