Bambang Suharno
Department Metallurgy and Materials, Faculty of Engineering, University of Indonesia Kampus UI, Depok 16424
Indonesia

Is Prima Nanda
Mechanical Engineering Department, University of Andalas Kampus Limau Manis, Padang 25163
Indonesia

Sri Harjanto
Department Metallurgy and Materials, Faculty of Engineering, University of Indonesia Kampus UI, Depok 16424
Indonesia

Erika Lirachandra
Department Metallurgy and Materials, Faculty of Engineering, University of Indonesia Kampus UI, Depok 16424
Indonesia