Tuning of nanomaterials by high pressure annealing
TEM micrographs of samples after annealing at 900°C for 10 min and at 0.1 MPa, 2 and 6 GPa:
a) Profile Rolling-processed b) High Pressure Torsion deformed
Tuning of nanomaterials by high pressure annealing
The general objective of this project is to assess the impact of the hydrostatic pressure during annealing of nanomaterials. The processes occurring during the annealing and the properties afterwards, in connection to the processing parameters need to be determined to establish the possibilities of the method for applications. Starting from simple nanocrystalline metals produced by HPT annealing at various hydrostatic pressures and temperatures shall be conducted together with references heated in a conventional furnace. Once the processes and the effects are well known and understood, the investigation can be extended to more complex materials consisting of multiple elements in the future.
Following questions are investigated:
• How does the impurities and alloying elements of investigated metals and alloys affect the processes of recrystallization and grain growth during annealing at high hydrostatic pressure in comparison with annealing at the atmospheric pressure?
• To what extent is it possible to improve the thermal stability of investigated metals and alloys while using annealing at high hydrostatic pressure?
• Do various annealing conditions lead to the creation of microstructures differing in terms of grain size, grain elongation, orientation, fraction of low-angle GBs and twinning frequency?
• What is the impact of pressure release between deformation and annealing at the high hydrostatic pressure on recrystallization and grain growth in metals and their alloys?
• To what extent is it possible to reach a high level of recovery without recrystallization or grain growth so that nanograins free from dislocations are created by applying HPAn?
• To what extent is it possible to improve strength-ductility balance of selected materials by applying HPAn?
Principal investigator: Erhard Schafler
Funder: FWF I-6082 joint project Weave-Unisono with Warsaw University of Technology
Project duration: 01.01.2023 - 31.12.2026