Influence of Process Parameters on Microhardness of AA7075/MWCNT Surface Composites Fabricated through Friction Stir Processing

Influence of Process Parameters on Microhardness of AA7075/MWCNT Surface Composites Fabricated through Friction Stir Processing
Author(s):
Syed Azeem Pasha, Ravinder Reddy P, Laxminarayana P, Buschaiah K
Keywords:
FSP, Microhardness, Rotational Speed, SMMC, Traverse Speed.
Abstract
The Surface metal matrix composites (SMMC) exhibit a unified combination of high tribological properties at the surface and toughness of the interior bulk metal. In the present work an attempt is made to fabricate SMMCs via Friction Stir Processing (FSP) by embedding Multiwall Carbon Nanotubes (MWCNT) in the Aluminium Aalloy 7075 surface layers. During FSP, Rotational Speed (RS), Traverse Speed (TS) and the No. of FSP Passes (NoP) are varied so as to obtained a variety of SMMC billets. The SMMCs are subjected to Vickers Hardness tests to evaluate their Microhardness across the stir zone. Taguchi technique is adopted to carry out the set of FSP experiments. The test results revealed that there is a steep enhancement in the microhardness at the stir zone. The RS and NoP have a significant effect on microhardness while the TS has a diverse effect on the same. The Taguchi main effect plots are extracted to analyze and also to estimate the optimal process parameters accordingly.
Article Details
Unique Paper ID: 145205 Publication Volume & Issue: Volume 4, Issue 7 Page(s): 665 - 670
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