High-Speed Rotational Diamond Anvil Cell (HS-RDAC) for Shear Deformation Study

A first of its kind high-speed rotational diamond anvil cell (HS-RDAC) has been tested at HPCAT beamlines. The device basically consists of a support diamond anvil and an opposing high-speed rotating diamond anvil, of which the rotation speed can be adjusted up to kilo-rpm level. The development is aimed at enabling a new platform to emulate deformation-based solid-state processing under moderate uniaxial compression condition and provide an experimental approach for predictive understanding of the fundamental atomic scale mechanism of mass and energy transfer under shear deformation conditions. As a pilot test, solid-state mixing of Cu-Ni binary powders has been tried, and the time-dependent lattice strain evolution and spatial variation of defect density across the sample dimension have been investigated. The study provides new insights into how interface mass transfer could be accelerated under shear deformation.