Preparation of TiAl15Si15 intermetallic alloy by mechanical alloying and the spark plasma sintering method

• Published in: Powder metallurgy Vol. 62; no. 1; pp. 54 - 60
• Main Authors: Knaislová, Anna, Linhart, Jiří, Novák, Pavel, Průša, Filip, Kopeček, Jaromír, Laufek, František, Vojtěch, Dalibor
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 01.01.2019; SAGE Publications
• Subjects: hardness; intermetallics; mechanical alloying; microstructure; phase composition; Powder metallurgy; spark plasma sintering; intermetallics; hardness; microstructure; phase composition; mechanical alloying; Powder metallurgy; spark plasma sintering
• ISSN: 0032-5899; 1743-2901
• DOI: 10.1080/00325899.2019.1569812

This work is devoted to the preparation of alloys based on intermetallic compounds in the Ti-Al-Si system by powder metallurgy using mechanical alloying and the spark plasma sintering (SPS) method. The aim was to describe the formation of intermetallic phases during mechanical alloying of TiAl15Si15 (wt-%) alloy and to consolidate the powder prepared by optimised conditions. Phase composition, microstructure and hardness of compacted alloy were determined. Four hours of mechanical alloying is sufficient time for preparation of pure elements free material composed only of intermetallic phases. After consolidation, the TiAl15Si15 alloy has a homogeneous structure composed of silicide (Ti 5 Si 3 ) in aluminide (TiAl) matrix. The hardness of the material reaches 865 ± 42 HV 5.