Table of Contents
Journal of Composites
Volume 2015 (2015), Article ID 428630, 9 pages
http://dx.doi.org/10.1155/2015/428630
Research Article

Fabrication of Friction Stir Processed Al-Ni Particulate Composite and Its Impression Creep Behaviour

Department of Metallurgical and Materials Engineering, NITK, Surathkal 575025, India

Received 6 September 2014; Revised 10 January 2015; Accepted 11 January 2015

Academic Editor: Hui Shen Shen

Copyright © 2015 Prakrathi Sampath et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nickel powders were troweled on roughened Al base plate using a friction tool made from tool steel. Friction stir processing (FSP) was carried out using a load of 8 kN and with a tool rotation speed of 800 rpm and thus a surface composite was processed. Processed samples were characterized for revealing the microstructural features. SEM and XRD analysis revealed the presence of fine Ni particles in the stir zone which lead to a significant increase in hardness. Using the “refined energy model,” the maximum temperature developed within the processed zone was estimated and found to be around 275°C. Impression creep behaviour was assessed on both the base metal and processed zone at the temperature of 30, 100, and 200°C. Creep curves were generated and steady state creep rate (SSCR) values were found out to determine the activation energy. It is observed that friction stirred regions record higher creep rate values compared to the base metal. Estimated activation energy is in the range of 6 to 16 kJ/mol. Activation energy is marginally lower in the base metal compared to friction stir processed region.