Effect of heat treatments with a pointed cooling on the mechanical compression properties of TiAl intermetalic

0354170 - ÚFM 2011 RIV CZ eng C - Conference Paper (international conference)
Petrenec, Martin - Kruml, Tomáš - Zemanová, Adéla - Krahula, Karel
Effect of heat treatments with a pointed cooling on the mechanical compression properties of TiAl intermetalic.
Metal 2010. 19th International conference on metallurgy and materials - Conference Proceedings. Ostrava: Tanger s.r.o., 2010, s. 828-833. ISBN 978-80-87294-17-8.
[Metal 2010. International Conference on Metallurgy and Materials /19./. Rožnov pod Radhoštěm (CZ), 18.05.2010-20.05.2010]
R&D Projects: GA ČR GA106/08/1631
Institutional research plan: CEZ:AV0Z20410507
Keywords : graded cooling heat treatments * DTA curve * TiAl-8Nb intermetallics * fully lamellar microstructure * compression tests
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The influence of the graded cooling heat treatments on a change in the structure and the room temperature mechanical compression properties of cast Ti-44Al-8Nb intermetallic were studied. The coolings were the air cooling and the graded cooling which was composed of combination of furnace cooling and air cooling for selected two temperatures 1315 °C and 1200 °C. These selected temperatures were used from the measuring of the differential thermal analysis (DTA). All heat treatments used remold the cast nearly lamellar structure ?/?2 to the fully lamellar uniform structure and decreased the average grain size to the half. The air cooling and the graded cooling with temperature 1315 °C were produced in higher yield stress and lower plasticity due the very thin lamellar thickness and planar grain boundary. While higher plasticity and lower yield stress are obtained using the graded cooling with temperature 1200 °C. It is caused by the very thick lamellar spacing and locked grain boundaries.
Permanent Link: http://hdl.handle.net/11104/0193231