Provider Grantová agentura České republiky
GAČR 107/12/0800 2012-2015
Proposer RNDr. Petr Šittner, CSc., FZÚ AV ČR, v.v.i.
Co-proposer prof. RNDr. Jaroslav Pokluda, CSc., Fakulta strojního inženýrství VUT Brno
Ing. Přemysl Beran, Ph.D., ÚJF AV ČR, v.v.i.
Title Fatigue of NiTiX High Temperature Shape Memory Alloy Actuators /FACT/
Název Únava aktuátorů z vysokoteplotních slitin s tvarovou pamětí NiTiX /FACT/

Currently there is renewal of interest in actuation functionality using high temperature shape memory alloys with transformation temperatures above 100°C (HTSMA) driven by strong demand for reliable and powerful actuators to be used in engines and gas turbines, where it is preferable to adopt single piece compact adaptive actuator over more complex multicomponent assemblies. The aim of this project is to clarify the reasons for poor dimensional and functional stability and fatigue failure of NiTiX actuators. The research will be performed by combination earlier developed and used methods (thermomechanical fatigue testing, in-situ X-ray and neutron di raction, TEM and micromechanics modeling) . The research will be coordinated with worldwide academic and industrial partners currently developing HTSMA actuators. Approaches to modify the microstructure of NiTiX alloys so so they act as well performing HTSMA actuators for 100°C-300°C temperature range will be proposed (adjustment of composition, degree of cold work, heat treatment, texture, grain size, precipitation strengthening).