Abstract
A research team at the University of Miskolc’s Faculty of Materials Science and Technology has signed a cooperation agreement with the Geneva-based European Organization for Nuclear Research (CERN) for testing of the materials employed in the Crab Cavities will be installed in the next generation of the LHC (the so-called High Luminosity Large Hadron Collider – HL-LHC). At the University of Miskolc, high purity niobium rolling experiments were carried out in conventional (unidirectional) and cross-rolled manners in order to increase the deep drawability of the final sheet. The deformability of niobium was measured by Watts-Ford and compression tests. The microstructure and anisotropy (texture) results of the initial material and the straight-rolled products are reported.
Highlights
Crab Cavities, SRF cavities of non-axisymmetric shape, made of ultra- high purity Nb are essential parts of the HL-LHC project
For unidirectional or straight rolling, where it is considered as a plane strain deformation, the sample has an orthorhombic symmetry
For cross rolling, where the sample is rotated by 90° after each pass, the sample symmetry becomes tetragonal, having one fourfold axis which is parallel to the normal direction [7]
Summary
Crab Cavities, SRF cavities of non-axisymmetric shape, made of ultra- high purity Nb are essential parts of the HL-LHC project. For unidirectional or straight rolling, where it is considered as a plane strain deformation, the sample has an orthorhombic symmetry. Due to continuous change in rolling direction, the microstructure, the texture and the plastic anisotropy will be different than that obtained in unidirectional rolling.
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