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Metallography, Microstructure, and Analysis

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10-10-2023 | Original Research Article

Influence of Cr₃C₂ Addition on Microstructure and Mechanical Properties of AA2618 Composites by Powder Metallurgy

Authors: Naga Venkata Srinivas Borra, Veera Venkata Krishna Prasad Davuluri

Published in: Metallography, Microstructure, and Analysis | Issue 5/2023

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Abstract

In the present work, Al-2.5Cu-1.5 Mg-1Ni (AA2618) aluminium alloy with the incorporation of Cr₃C₂ reinforcement at 2, 3, 4 and 5 wt.% was systematically investigated. The composite powders were initially ball-milled and cold-compacted at 400 and 450 MPa. The pressure-less sintering was done at 550 and 600 °C for a holding time of 60 and 90 min under vacuum atmosphere. The experiments are implemented in accordance with Taguchi L₈ OA with four process factors and four response characteristics. The results indicate that significant microstructural refinement with the precipitation of new Al-Cr-C compound was noticed up to 4 wt.% of Cr₃C₂ reinforcement, leading to tensile strength improvement at 28 and 200 °C. However, the strength was decreased at 5 wt.% Cr₃C₂ reinforcement, which could be attributed to the presence of coarse grain structure and agglomerated large GB precipitate.

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Title: Influence of Cr3C2 Addition on Microstructure and Mechanical Properties of AA2618 Composites by Powder Metallurgy
Authors: Naga Venkata Srinivas Borra
Veera Venkata Krishna Prasad Davuluri
Publication date: 10-10-2023
Publisher: Springer US
Published in: Metallography, Microstructure, and Analysis / Issue 5/2023
Print ISSN: 2192-9262
Electronic ISSN: 2192-9270
DOI: https://doi.org/10.1007/s13632-023-01003-8

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