Next Article in Journal
Dissimilar Metal Welding
Previous Article in Journal
Thermal Methods for Damage Evaluation of Metallic Materials
Open AccessArticle

Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Composite Made of Al-Si-Cu-Mg Aluminum Alloy Reinforced with SiC Particles

by Xin Li 1,2, Hong Yan 1,*, Zhi-Wei Wang 1, Ning Li 1,2, Jian-Long Liu 3 and Qiao Nie 3
1
School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China
2
School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China
3
Jiangxi Ling-Ge Non-ferrous Metal Processing Co., Ltd., Nanchang 330008, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(11), 1205; https://doi.org/10.3390/met9111205
Received: 9 October 2019 / Revised: 29 October 2019 / Accepted: 4 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue Aluminum Alloys and Aluminum Matrix Composites)
In this paper, the effect of heat treatment (solution treatment and artificial aging) on the microstructure and properties of as-cast Al5Si1Cu0.5Mg aluminum alloy and its composite reinforced with 1.5 wt.% SiC particles was studied. The results showed that at 520 °C the optimal solution time for the aluminum alloy and its composite is 9 h and 6 h, respectively. After solution treatment, the microstructure of these two materials consists of a uniform distribution of nearly spherical eutectic Si and skeletal γ phase, furthermore, the composite eutectic Si phase is smaller and γ phase is more dispersed. After artificial aging at 175 °C for 6 h, the microstructure of the composite is more dispersed and finer than that of the aluminum alloy on the whole and Al2Cu is precipitated. After heat treatment, the microhardness, ultimate tensile strength, and elongation of the aluminum alloy and its composite are higher than those of the as-casts. At the same time, the morphology of tensile fracture surface changes very much from a large area of cleavage plane to a large number of dimples and the tearing ridges become thicker for both the aluminum alloy and its composite.
Keywords: Al5Si1Cu0.5Mg aluminum alloy; SiC reinforced composite; heat treatment; microstructure; mechanical properties Al5Si1Cu0.5Mg aluminum alloy; SiC reinforced composite; heat treatment; microstructure; mechanical properties
MDPI and ACS Style

Li, X.; Yan, H.; Wang, Z.-W.; Li, N.; Liu, J.-L.; Nie, Q. Effect of Heat Treatment on the Microstructure and Mechanical Properties of a Composite Made of Al-Si-Cu-Mg Aluminum Alloy Reinforced with SiC Particles. Metals 2019, 9, 1205.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop