Vliv tepelného zpracování na strukturu a vlastnosti slitin na bázi Ti-Al

Abstract

Intermetallic alloys based on TiAl show very good mechanical properties – high strength, low weight, good oxidation resistance at elevated temperatures. However, intermetallic based on TiAl have low creep resistance at temperatures higher than 750 °C. In this work, we investigate a gamma-type TiAl intermetallic alloy that is alloyed with carbon by adding TiC powder in-situ during vacuum induction melting using isostatically pressed graphite crucibles to achieve solid solution hardening and carbide precipitation. By means of a suitable heat treatment, we wanted to achieve a fully lamellar microstructure of the alloy. The aim was to check the hardness of the alloy and test the microstructural stability at higher temperatures, or more precisely at temperatures of 700, 800 and 900 °C.