Mechanical Properties of In-situ Synthesised Nano Al2O3/Al-Zn-Cu Composites

doi:10.11901/1005.3093.2021.144

Chinese Journal of Materials Research

2022, Vol. 36

Issue (4): 307-313 DOI: 10.11901/1005.3093.2021.144

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Mechanical Properties of In-situ Synthesised Nano Al₂O₃/Al-Zn-Cu Composites

LIU Siyu, LI Zhengyuan(

), CHEN Lijia, LI Feng

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110136, China

Cite this article:

LIU Siyu, LI Zhengyuan, CHEN Lijia, LI Feng. Mechanical Properties of In-situ Synthesised Nano Al₂O₃/Al-Zn-Cu Composites. Chinese Journal of Materials Research, 2022, 36(4): 307-313.

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Abstract

Nano Al₂O₃ particles reinforced Al-Zn-Cu alloy composite of Al₂O₃/Al-Zn-Cu was prepared by a two-step process, namely nano-ZnO powder and Al powder were first ball-milled and then cold-pressed to prepare Al-ZnO preforms, and next which was added to the stirring Al-Zn-Cu melt, thereby nano Al₂O₃ particles reinforced Al-Zn-Cu based composites were prepared through Al-ZnO in-situ reaction. The results of energy spectrum scan and transmission electron microscope show that there are mainly two kinds of particles/precipitated phases in the composite material: nano Al₂O₃ particles and Al₂Cu precipitated phases. The grain structure and precipitates of Al-Zn-Cu alloy were refined by nano-sized Al₂O₃ particles through the heterogeneous nucleation and grain boundary pinning. The formation of in-situ nano Al₂O₃ particles could enhance the tensile properties of the base alloy. After proper rolling + heat treatment the Al₂O₃/Al-Zn-Cu composites present tensile strength and total elongation percentage ca 100% and 98% higher than that of the Al-Zn-Cu matrix alloy equally treated, respectively.

Key words: composite nano Al₂O₃ particles in-situ Al-ZnO system

Received: 21 February 2021

ZTFLH:

TG146.2

Fund: Liaoning Provincial Department of Education Science and Technology Research Service Local Project(201724141)

About author: LI Zhengyuan, Tel: (024)25496301, E-mail: zhengyli@sut.edu.cn

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	Siyu LIU
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https://www.cjmr.org/EN/10.11901/1005.3093.2021.144 OR https://www.cjmr.org/EN/Y2022/V36/I4/307

Table 1 Mechanical properties of part common Al₂O₃ particle reinforced Al matrix composite

Fig.1 Energy spectrum scan of Al-ZnO powder after ball milling

Table 2 Al₂O₃/Al-Zn-Cu composite material composition (mass fraction, %)

Fig.2 XRD patterns of Al-ZnO powder (a) and composite materials (b)

Fig.3 EBSD patterns of Al-Zn-Cu base alloy (a) and Al₂O₃/Al-Zn-Cu composite (b) after rolling + heat treatment

Fig.4 BSE images of Al-Zn-Cu base alloy (a) and Al₂O₃/Al-Zn-Cu composite (b) after rolling + heat treatment

Fig.5 EDS mapping of Al₂O₃/Al-Zn-Cu composite after rolling + heat treatment

Fig.6 TEM image of Al₂O₃/Al-Zn-Cu composite (a) and SAED of α-Al₂O₃(b) and Al₂Cu/α-Al (c) after rolling + heat treatment

Fig.7 Stress-strain curve of Al-Zn-Cu matrix alloys and nano Al₂O₃/Al-Zn-Cu composites

Table 3 Tensile strength, yield strength and total elongation of Al-Zn-Cu base alloy and Al₂O₃/Al-Zn-Cu composite

Fig.8 Tensile fracture morphology of Al-Zn-Cu matrix alloys and nano Al₂O₃/Al-Zn-Cu composites (a) As-cast Al-Zn-Cu; (b) Rolling + heat treatment Al-Zn-Cu; (c) As-cast Al₂O₃/Al-Zn-Cu; (d) Rolling + heat treatment Al₂O₃/Al-Zn-Cu

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