1. Dept. of Metallurgical and Materials Engineering, National Institute of Technology, Karnataka, Surathkal, Srinivasnagar, Mangalore 575025, IN.
2. Light Metals and Composites Division, National Institute for Interdisciplinary Science & Technology (CSIR), Trivandrum 695019, IN, e-mail: manickravi@yahoo.com
3. Dept. of Metallurgical and Materials Engineering, National Institute of Technology, Karnataka, Surathkal, Srinivasnagar, Mangalore 575025, IN, e-mail: prabhukn_2002@yahoo.co.in