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  Scopus ID: 21100926589

Improvement of Surface Roughness on AA7178/Nano ZrO2/Fly Ash Metal-matrix Composite via Novel Encapsulate Stir Casting Technique by Drilling Process

Konka Mahesh, Lakshmaiya Natrayan and Agaram Sundaram Vickram

Abstract

This research aims to compare the surface roughness of AA7178 reinforced with 5% fly ash and 5% nano zirconium oxide (ZrO2) hybrid composites fabricated using a novel encapsulation process to that of as-cast AA7178 alloy. Group 1 consists of AA7178 as-cast samples without any composite material, whereas group 2 comprises AA7178 metal matrix composite prepared using a hybrid composite of fly ash (5%), nano ZrO2 (5%), and AA7178. The samples for both groups are fabricated by stir casting using a novel encapsulation technique. The samples of both groups were created by following the ASTM E92 guidelines, and a Mitutoyo surface roughness tester (SJ-410) was used to measure the sample’s surface roughness. 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; each group contains 20 samples. The samples filled with reinforcement of (5% and 5%) fly ash and nano ZrO2 exhibit a more excellent surface finish than samples of as-cast AA7178 without any reinforcement. Based on t-test statistical analysis, it is obtained that there is a significant p = 0.00 (p < 0.05) difference between group 1 and group 2 in the mean variance of surface roughness. Within the limitations of this study, it proves that the reinforcement of AA7178 with 5% fly ash and 5% nano ZrO2 considerably decreases 29.90% of surface roughness compared to as-cast AA7178 alloy.

Published on: October 16, 2023
doi: 10.17756/nwj.2023-s3-078
Citation: Mahesh K, Natrayan L, Vickram AS. 2023. Improvement of Surface Roughness on AA7178/Nano ZrO2/Fly Ash Metal-matrix Composite via Novel Encapsulate Stir Casting Technique by Drilling Process. NanoWorld J 9(S3): S429-S433.

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