Document Type

Journal Article

Publication Title

Materials

Volume

15

Issue

15

Publisher

MDPI

School

School of Engineering

RAS ID

45380

Comments

Khan, A. H., Shah, S. A. A., Umar, F., Noor, U., Gul, R. M., Giasin, K., & Aamir, M. (2022). Investigating the microstructural and mechanical properties of novel ternary reinforced AA7075 hybrid metal matrix composite. Materials, 15(15), 5303. https://doi.org/10.3390/ma15155303

Abstract

This study investigates the comparison of the microstructural and mechanical properties of a novel ternary reinforced AA7075 hybrid metal matrix composite. Four samples, including AA7075 (base alloy), AA7075-5wt % SiC (MMC), AA7075-5wt %SiC-3wt % RHA (s-HMMC), and AA7075-5wt % SiC-3wt % RHA-1wt % CES (n-HMMC) were developed using the stir casting liquid metallurgy route, followed by the heat treatment. The experimental densities corresponded with the theoretical values, confirming the successful fabrication of the samples. A minimum density of 2714 kg/m3 was recorded for the n-HMMC. In addition, the highest porosity of 3.11 % was found for n-HMMC. Furthermore, an increase of 24.4% in ultimate tensile strength and 32.8 % in hardness of the n-HMMC was recorded compared to the base alloy. However, its ductility and impact strength was compromised with the lower values of 5.98 % and 1.5 J, respectively. This was confirmed by microstructural analysis, which reveals that n-HMMC has mixing issues and forms agglomerates in the matrix, which served as the potential sites of stress concentration leading to low impact strength and ductility. Nevertheless, the hybrid composites showed superior mechanical properties over the MMC and its base alloy.

DOI

10.3390/ma15155303

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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