Hardness and dry sliding wear behaviour of Al7050 hybrid composites produced by stir casting

• Autorzy: Srivallirani Katepalli , Venkateswara Rao M
• Języki publikacji: EN

Abstrakty

EN

Hardness and dry sliding wear behaviour of Al7050 hybrid composites produced by stir casting The current study aims to investigate at the tribological properties of Al7050 reinforced with TiO₂ and BN particles utilising a pin-on-disc apparatus. By means of the stir-casting process, MMCs were fabricated with three different weight percentages of TiO₂ particles: 1, 3, and 5%, as well as various weight percentages of h-BN particles: 2, 4, and 6%. The volumetric wear rates and coefficients of friction were continuously recorded under normal loads of 20-40 N, sliding speeds of 2-4 m/s and for sliding distances of 1000, 1500 and 2000 m. Microstructural analysis revealed that the TiO₂ and BN particles were uniformly dispersed throughout the Al7050 matrix with minimal agglomeration. The experimental data reveals that the tensile strength and Vickers hardness of the cast hybrid composites gradually improved by increasing the weight percentages of the TiO₂ and h-BN reinforcing particles. The worn micrographs reveal that abrasion and delamination are the dominant wear mechanisms in the case of the hybrid composites. The composite containing 6 wt.% h-BN particles had the lowest coefficient of friction and wear rate at a normal load of 40 N, sliding speed of 4 m/s and for the sliding distance of 2000 m when compared to other composites. On the other hand, the composites with 2 wt.% h-BN particles had the highest coefficient of friction and wear rate. The XRD analysis showed the generation of strong interfacial reactions, which contributed to the hardness of the hybrid composites.

Słowa kluczowe

EN

Al7050; TiO2; h-BN; stir casting; SEM; mechanical wear; XRD

PL

Al7050; TiO2; h-BN; odlewanie z mieszaniem; SEM; zużycie mechaniczne; XRD

• Wydawca: Polskie Towarzystwo Materiałów Kompozytowych
• Czasopismo: Composites Theory and Practice
• Rocznik: 2022
• Tom: R. 22, nr 3
• Strony: 150--159
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Srivallirani Katepalli

• Department of Mechanical Engineering, Acharya Nagarjuna University, Guntur, Andhra Pradesh-522510, India

autor

Venkateswara Rao M

• Department of Mechanical Engineering, Bapatla Engineering College, Bapatla, Andhra Pradesh-522101, India

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).