Spark plasma assisted in-situ phase evolution and densification of nano-crystalline magnesium silicide – silicon germanium thermo-electric composite: Pulse current effects and densification mechanisms. (15th March 2018)

• Record Type: Journal Article
• Authors: Vivekanandhan, P; Murugasami, R; Kumaran, S
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 344
• Page End: 348
• Publication Date: 2018-03-15
• Subjects: Magnesium silicide-silicon germanium -- Spark plasma sintering -- X-ray diffraction -- Transmission electron microscopy -- Thermoelectric materials; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.12.021
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The current work reports on the investigation of mechanisms involved during spark plasma assisted in-situ nano-crystalline magnesium silicide (Mg2 Si) phase evolution and the simultaneous densification with the substantial increase of nano-structured silicon-germanium alloy (SiGe) inclusion. The anisothermal sintering was carried out up to 650 °C with an applied pressure of 50 MPa in the vacuum atmosphere (~ 10 Pa). X-ray diffraction and electron microscopy studies conceded the formation of Mg2 Si matrix phase and presence of SiGe inclusion. The synthesized thermo-electric composite demonstrated the superior density (> 95%). The synthesized TE composites shows the benchmark hardness values > 0.97 GPa. Graphical abstract: Image 1