Microstructure and strengthening effect of coated diamond particles on the porous aluminum composites

• Main Authors: Parveez, Bisma, Jamal, Nur Ayuni, Aabid, Md. Abdul, Baig, Alya Naili
• Format: Article
• Language: English; English
• Published: MDPI 2023
• Subjects: T Technology (General); TA401 Materials of engineering and construction
• Online Access: http://irep.iium.edu.my/111072/2/111072_Microstructure%20and%20strengthening%20effect%20of%20coated%20diamond_SCOPUS.pdf; http://irep.iium.edu.my/111072/3/111072_Microstructure%20and%20strengthening%20effect%20of%20coated%20diamond.pdf; http://irep.iium.edu.my/111072/; https://www.mdpi.com/1996-1944/16/8/3240/pdf?version=1681963144

In this work, porous Al alloy-based composites with varying Ti-coated diamond contents (0, 4, 6, 12 and 15 wt.%) were prepared, employing the powder metallurgy route and using a fixed amount (25 wt.%) of polymethylmethacrylate (PMMA) as a space holder. The effects of the varying wt.% of diamond particles on the microstructure, porosities, densities and compressive behaviors were systematically evaluated. The microstructure study revealed that the porous composites exhibited a well-defined and uniform porous structure with good interfacial bonding between the Al alloy matrix and diamond particles. The porosities ranged from 18% to 35%, with an increase in the diamond content. The maximum value of plateau stress of 31.51 MPa and an energy absorption capacity of 7.46 MJ/m3 were acquired for a composite with 12 wt.% of Ti-coated diamond content; beyond this wt.%, the properties declined. Thus, the presence of diamond particles, especially in the cell walls of porous composites, strengthened their cell walls and improved their compressive properties.