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  Scopus ID: 21100926589

Effect of Nano ZrO2/Fly Ash Particles on Hardness of AA7178 Metal Matrix Composites Using Novel Encapsulate Stir Casting Technique

Konka Mahesh, Lakshmaiya Natrayan and Sivakumar Vidhya Lakshmi

Abstract

This study compares the hardness level of as-cast AA7178 with a reinforced hybrid metal matrix composite fabricated with fly ash (5%) and nano zirconium oxide (ZrO2) (5%) hybrid composites using a novel encapsulation technique. The samples for both groups were created using a novel encapsulating process employing the stir-casting method. For group 2, a hybrid composite of fly ash (5%), nano ZrO2 (5%), and AA7178 was used, whereas AA7178 as-cast was used for group 1. The samples were made following ASTM E92 criteria, and their hardness was measured using a Vickers hardness machine. Each group with 20 samples was fabricated. The G-power used for this process is 80%, α = 0.05 per set for calculating sample size and the total sample size is 40. The maximum hardness of the (5% and 5%) fly ash and nano ZrO2 filled material is 35.61% greater than the as-cast AA7178. T-test statistical analysis reveals a significant p = 0.00 (p < 0.05) difference in the mean-variance of hardness between groups 1 and 2. Within the constraints of this study, it was observed that adding 5% fly ash and 5% nano ZrO2 reinforcement with AA7178 composite significantly enhances hardness.

Published on: October 17, 2023
doi: 10.17756/nwj.2023-s3-083
Citation: Mahesh K, Natrayan L, Lakshmi SV. 2023. Effect of Nano ZrO2/Fly Ash Particles on Hardness of AA7178 Metal Matrix Composites Using Novel Encapsulate Stir Casting Technique. NanoWorld J 9(S3): S455-S459.

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