title: Self-consolidation mechanism of nanostructured Ti5Si3 compact induced by electrical discharge.
abstract: Electrical discharge using a capacitance of 450 μF at 7.0 and 8.0 kJ input energies was applied to mechanical alloyed Ti5Si3 powder without applying any external pressure. A solid bulk of nanostructured Ti5Si3 with no compositional deviation was obtained in times as short as 159 μsec by the discharge. During an electrical discharge, the heat generated is the required parameter possibly to melt the Ti5Si3 particles and the pinch force can pressurize the melted powder without allowing the formation of pores. Followed rapid cooling preserved the nanostructure of consolidated Ti5Si3 compact. Three stepped processes during an electrical discharge for the formation of nanostructured Ti5Si3 compact are proposed: (a) a physical breakdown of the surface oxide of Ti5Si3 powder particles, (b) melting and condensation of Ti5Si3 powder by the heat and pinch pressure, respectively, and (c) rapid cooling for the preservation of nanostructure. Complete conversion yielding a single phase Ti5Si3 is primarily dominated by the solid-liquid mechanism.
authors.affiliation: Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: W H
authors.initials: WH
authors.lastname: Lee
authors.affiliation: Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: Y W
authors.initials: YW
authors.lastname: Cheon
authors.affiliation: Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: Y H
authors.initials: YH
authors.lastname: Jo
authors.affiliation: Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: J G
authors.initials: JG
authors.lastname: Seong
authors.affiliation: Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 143-747, Republic of Korea.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Jo
authors.affiliation: Department of Dental Laboratory Technology, Wonkwang Health Science University, Iksan 570-750, Republic of Korea.
authors.forename: Y H
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Center for SCINOVATOR, Posung High School, Seoul 138-829, Republic of Korea.
authors.forename: M S
authors.initials: MS
authors.lastname: Noh
authors.affiliation: Center for SCINOVATOR, Posung High School, Seoul 138-829, Republic of Korea.
authors.forename: H G
authors.initials: HG
authors.lastname: Jeong
authors.affiliation: Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Van Tyne
authors.affiliation: Department of Materials Engineering, Korea Aerospace University, Goyang-si 412-791, Republic of Korea.
authors.forename: S Y
authors.initials: SY
authors.lastname: Chang