Self-Consolidation Mechanism of Nanostructured Ti5Si3 Compact Induced by Electrical Discharge. (25th March 2015)

• Record Type: Journal Article
• Authors: Lee, W. H.; Cheon, Y. W.; Jo, Y. H.; Seong, J. G.; Jo, Y. J.; Kim, Y. H.; Noh, M. S.; Jeong, H. G.; Van Tyne, C. J.; Chang, S. Y.
• Other Names: Zhao Xiao-Feng Academic Editor.
• Is Part Of: TheScientificWorldjournal. Volume 2015(2015)
• Publication Date: 2015-03-25
• Subjects: Science -- Periodicals; Technology -- Periodicals; Medicine -- Periodicals; 505
• DOI: 10.1155/2015/815084
• Languages: English
• ISSNs: 2356-6140

Abstract

Abstract : Electrical discharge using a capacitance of 450 μ F at 7.0 and 8.0 kJ input energies was applied to mechanical alloyed Ti5 Si3 powder without applying any external pressure. A solid bulk of nanostructured Ti5 Si3 with no compositional deviation was obtained in times as short as 159 μ sec by the discharge. During an electrical discharge, the heat generated is the required parameter possibly to melt the Ti5 Si3 particles and the pinch force can pressurize the melted powder without allowing the formation of pores. Followed rapid cooling preserved the nanostructure of consolidated Ti5 Si3 compact. Three stepped processes during an electrical discharge for the formation of nanostructured Ti5 Si3 compact are proposed: (a) a physical breakdown of the surface oxide of Ti5 Si3 powder particles, (b) melting and condensation of Ti5 Si3 powder by the heat and pinch pressure, respectively, and (c) rapid cooling for the preservation of nanostructure. Complete conversion yielding a single phase Ti5 Si3 is primarily dominated by the solid-liquid mechanism.