Institute of Physics of Materials AS CR, v. v. i. > Projects > Mechanism of cyclic deformation and fatigue life of advanced multiphase materials for high-temperature applications

Mechanism of cyclic deformation and fatigue life of advanced multiphase materials for high-temperature applications

InvestigatorIng. Martin Petrenec, Ph.D.
Number of Project106/08/1631
AgencyGrantová agentura České republiky
Duration2007-12-31 - 2010-12-30

Anotace
The project is aimed to obtain new information about mechanisms of cyclic plastic deformation of advanced gamma-TiAl intermetallics with high resistance to cyclic strain at elevated temperatures. These alloys with duplex or fully lamellae structure are used primarily in aircraft industry for high-temperature applications working up to 900°C. The project is focused on a mapping of dislocation structures using the oriented foils technique to obtain 3-D image of dislocation arrangement in the individual phases and grains. The main attention will be paid to regions of cyclic plastic strain localization which is decisive for the origin of fatigue damage. Microscopic techniques TEM, SEM and AFM will be used to study of cast advanced gamma-TiAl intermetallic with two types structures cyclically strained in total or plastic strain amplitude control at room and high temperatures. Experimental data obtained will contribute to the understanding of damage mechanisms of modern intermetallics during low cycle fatigue at high temperature and to the improvement of fatigue life evaluation.


2011

Šmíd M., Petrenec M., Polák J., Obrtlík K., Chlupová A.: Analysis of the Effective and Internal Cyclic Stress Components in the Inconel Superalloy Fatigued at Elevated Temperature. Adv. Mater. Res. 278 (2011) 393-398