Mechanical properties of nanocrystalline materials

Principles of equal-channel angular pressing as a processing tool for grain refinement

https://material.karlov.mff.cuni.cz/people/janecek/studenti/FyzMetNano/Estrin_AM61_2013_782.pdf

Extreme grain refinement by severe plastic deformation: A wealth of challenging science

Strengthening mechanisms in nanostructured high-purity aluminium deformed to high strain and annealed

What is behind the inverse Hall–Petch effect in nanocrystalline materials?

Strain rate sensitivity of ultrafine-grained aluminium processed by severe plastic deformation

Enhanced Strength and Ductility in Ultrafine‐Grained Aluminium Produced by Accumulative Roll Bonding

Localized corrosion of ultrafine-grained Al–Mg model alloys

The strain-rate sensitivity of commercial purity Aluminium (Al 99.5) and of α-iron, with both conventional (CG) and ultrafine (UFG) grain sizes, are investigated by compression and tension tests at different temperatures. Microstructural investigations were performed before and after compression testing in order to investigate the microstructural stability. Pronounced strain rate sensitivity was found for UFG Al at room temperature as well as at elevated temperatures, while for UFG α-iron an enhanced strain-rate sensitivity was found only at elevated temperatures.

Strain-rate sensitivity of ultrafine-grained materials

The kind and amount of alloying elements strongly affects the formation of ultrafine-grained microstructures. Aluminum alloys with different amounts of the alloying element magnesium, and a commercially pure aluminum alloy, have been investigated in order to evaluate how the obtained microstructures will affect the mechanical properties. X-ray profile analysis has been used to determine grain size and dislocation density. With increasing amounts of alloying elements, a smaller grain size and a higher dislocation density after severe plastic deformation (SPD) are obtained, which lead to higher hardness and improved fatigue properties.

Johannes May

Papers

Strain rate sensitivity of ultrafine-grained aluminium processed by severe plastic deformation

Enhanced Strength and Ductility in Ultrafine‐Grained Aluminium Produced by Accumulative Roll Bonding

Localized corrosion of ultrafine-grained Al–Mg model alloys

Strain-rate sensitivity of ultrafine-grained materials

Mechanical Properties, Dislocation Density and Grain Structure of Ultrafine-Grained Aluminum and Aluminum-Magnesium Alloys