Effect of Sc on Microstructure and Mechanical Property of 7055 Al-alloy

doi:10.11901/1005.3093.2017.233

Chinese Journal of Materials Research

2018, Vol. 32

Issue (2): 112-118 DOI: 10.11901/1005.3093.2017.233

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Effect of Sc on Microstructure and Mechanical Property of 7055 Al-alloy

Guangbiao TENG¹, Chongyu LIU¹(

), Jian LI², Zongyi MA³(

), Wenbiao ZHOU², Jing XIANG²

1 Key Laboratory of New Processing Technology for Nonferrous Metal & Materials, Ministry of Education, Guilin University of Technology, Guilin 541004, China;
2 Alnan Aluminium Co., Ltd., Nanning 530031, China
3 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

Guangbiao TENG, Chongyu LIU, Jian LI, Zongyi MA, Wenbiao ZHOU, Jing XIANG. Effect of Sc on Microstructure and Mechanical Property of 7055 Al-alloy. Chinese Journal of Materials Research, 2018, 32(2): 112-118.

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Abstract

The effect of Sc addition on the microstructure and mechanical properties of 7055 Al-alloy as-cast, as well as after homogenization-, rolling-, solution- and aging-treatment was investigated. The addition of 0.25%(mass fraction) Sc could lead to the formation of Al₃(Sc, Zr) phase, which can promote the heterogeneous nucleation during casting. Therefore, the microstructure of the as cast 7055 Al-alloy was refined. The precipitation of nano-sized Al₃(Sc, Zr) phase occurred during the homogenization treatment of the 7055-Sc Al-alloy, and this nano-sized Al₃( Sc, Zr) phase could effectively inhibit the coarsening of Al grains during homogenization treatment, and play a role in pinning the grain boundaries, therewith inhibiting the recovery and recrystallization, thus retaining the fiber-like structure during subsequent rolling and solution treatments. Compared to the plain 7055 Al-alloy, the 7055-Sc Al alloy exhibited much higher fine grain strengthening effect due to finer grain size and showed higher tensile strength and hardness as high as 642 MPa and 218 HV, respectively.

Key words: metallic materials rolling heat treatments mechanical properties microstructure Al alloys

Received: 05 April 2017

ZTFLH:

TG146.2

Fund: Supported by National Natural Science Foundation of China (No. 51601045), Research Program of Science and Technology of Guangxi (No. GKAB16380021), and Guangxi "Bagui" Teams for Innovation and Research

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	Guangbiao TENG
	Chongyu LIU
	Jian LI
	Zongyi MA
	Wenbiao ZHOU
	Jing XIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.233 OR https://www.cjmr.org/EN/Y2018/V32/I2/112

Fig.1 OM micrographs of as-cast AA 7055(a) and 7055-Sc alloys (b)

Fig.2 SEM micrograph (a) and EDS maps (b~f) of as-cast 7055-Sc alloy

Fig.3 OM micrographs of (a) AA 7055 and (b) 7055-Sc alloys after homogenizing treatment

Fig.4 SEM micrograph (a), and EDS maps (b~f) of 7055-Sc alloy after homogenizing treatment

Fig.5 TEM micrographs of AA 7055(a) and AA 7055-0.25Sc alloys (b) after homogenizing treatment (the arrows in panel (b) denote the (110) and (001) planes)

Fig.6 OM micrographs of AA 7055 (a) and AA 7055-0.25Sc (b) alloys after rolling

Fig.7 OM micrographs of AA 7055 (a) and AA 7055-0.25Sc (b) alloys after solution treatment

Fig.8 TEM micrographs of AA 7055(a, b), and AA 7055-0.25Sc (c, d) alloys after aging

Table 1 Mechanical properties of the AA 7055 and AA 7055-0.25Sc alloys after aging

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