Abstract
A down‐sized high‐pressure torsion device is developed to be used in an INSTRON deformation machine available at the High Energy Materials Science beamline at PETRA III. This setup allows to obtain synchrotron diffraction patterns in situ during severe plastic straining. Two different materials are studied: in pure Ni, the dislocation density and coherently scattering domain size are analyzed; in NiTi shape memory alloy, amorphization and a reverse martensitic phase transformation are investigated. The in situ experiments facilitate the characterization of the microstructural evolution of these materials depending on uniaxial loading, hydrostatic pressure, and torsional strain.
Highlights
INSTRON deformation machine available at the High Energy Materials Science beamline at PETRA III
In situ High-pressure torsion (HPT) is used to study structural changes in two materials, pure Ni and a NiTi shape memory alloy, with fundamentally different deformation properties: face-centered-cubic Ni is a very ductile monophase material where plastic deformation is due to generation and movement of dislocations with cross-slip facilitated by high stacking fault energy.[11]
The successful implementation of a mini-HPT device favored by the design and instrumentation of the High Energy Materials Science beamline at PETRA III enabled a primal in situ HPT investigation, allowing for quantitative analysis of the enormously plastically strained microstructure
Summary
INSTRON deformation machine available at the High Energy Materials Science beamline at PETRA III This setup allows to obtain synchrotron diffraction patterns in situ during severe plastic straining. In situ HPT is used to study structural changes in two materials, pure Ni and a NiTi shape memory alloy, with fundamentally different deformation properties: face-centered-cubic (fcc) Ni is a very ductile monophase material where plastic deformation is due to generation and movement of dislocations with cross-slip facilitated by high stacking fault energy.[11] Using the adapted Mini-HPT device, the microstructural evolution of pure Ni during severe plastic straining is investigated in situ by recording synchrotron X-ray diffraction profiles.
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