Abstract
Nanocrystalline plays an important role in improving the mechanical properties of materials due to their high proportion of grain boundaries. In this paper, high-pressure sintered Ni1.5Co1.5CrTi0.4 multi-principle element alloy (MPEA) was treated by high pressure torsion (HPT) under a pressure of 6 GPa for refining grains to obtain nanocrystalline. The MPEA after HPT becomes a gradient material along the radius from center to edge. The grain size near the edge is less than 100 nm. The deformation mechanisms include single slip at low strain and the combination of cross slips, dislocation cell plus deformation twinning at high strain. The Vickers hardness achieves a significant improvement from 441.72 ± 6.51 HV to 542.72 ± 5.53 HV (a saturation state at the edge), by HPT.
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