Role of Ti۳AlC۲ MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part I: sintering and densification
Publish place: Synthesis and Sintering، Vol: 1، Issue: 3
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_SYNSINT-1-3_006
تاریخ نمایه سازی: 9 آبان 1401
Abstract:
Five TiAl–Ti۳AlC۲ composite samples containing (۱۰, ۱۵, ۲۰, ۲۵ and ۳۰ wt% Ti۳AlC۲ MAX phase) were prepared by spark plasma sintering technique at ۹۰۰ °C for ۷ min under ۴۰ MPa. For this purpose, metallic titanium and aluminum powders (aiming at the in-situ formation of the TiAl matrix phase) were ball-milled with predetermined contents of Ti۳AlC۲ MAX phase, which already was synthesized using the same metallic powders as well as graphite flakes. Displacement-time-temperature variations during the heating and sintering steps, displacement rate versus temperature, displacement rate versus time, and densification behavior were studied. Two sharp changes were detected in the diagrams: the first one, ~۱۶ min after the start of the heating process due to the melting of Al, and the second one, after ~۳۵ min because of the sintering progression and the applied final pressure. The highest relative densities were measured for the samples doped with ۲۰ and ۲۵ wt% Ti۳AlC۲ additives. More Ti۳AlC۲ addition resulted in decreased relative density because of the agglomeration of MAX phase particles.
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Authors
Maryam Akhlaghi
Central Reference Laboratory, Iran University of Science and Technology, Narmak, Tehran, ۱۶۸۴۴, Iran
Esmaeil Salahi
Ceramics Department, Materials and Energy Research Center (MERC), Karaj, Iran
Seyed Ali Tayebifard
Semiconductors Department, Materials and Energy Research Center (MERC), Karaj, Iran
Gert Schmidt
Faculty of Mechanical, Process and Energy Engineering, TU Bergakademie, Freiberg, Germany