Synthesis of the Ti6Si2B compound by mechanical alloying

• Published in: Journal of alloys and compounds Vol. 428; no. 1-2; pp. 173 - 178
• Main Authors: SILVA, Gilbert, COAGLIA TRINDADE RAMOS, Erika, SARAIVA RAMOS, Alfeu
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier 31-01-2007
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Materials synthesis; materials processing; Physics; Differential scanning calorimetry; Scanning electron microscopy; Powders; Titanium borides; Intermetallic compounds; Silicon borides; Amorphization; Microanalysis; Intermetallics; XRD; Mechanical alloying; Heat treatments; Amorphisation; Synthesis; Powder technology; Microstructure; Supersaturated solid solution
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2005.12.124

The present work reports on the synthesis of Ti6Si2B powders by mechanical alloying from elemental Ti-22.2at.%Si-11.1at.%B powder mixtures. The milled powders were then heat-treated at 1100 deg C for 4h in order to attain the equilibrium microstructure. Samples were characterized by means of X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and microanalysis via EDS/WDS. Results indicated that the silicon and boron atoms were dissolved into the Ti lattice to form a supersaturated solid solution in Ti-22.2Si-11.1B powders milled for 30h. It was noticed the formation of an amorphous phase in Ti-22.2Si-11.1B powders milled for 100 and 200h. Thermal analysis indicated the presence of an intense exothermic peak located close to 550 deg C during heating of mechanically alloyed Ti-22.2Si-11.1B powders, which was associated to the Ti6Si2B formation. A large amount of Ti6Si2B was formed in Ti-22.2Si-11.1B powders after heating at 1100 deg C for 4h.