Grain Boundary Sliding During High Pressure Torsion of Nanocrystalline Au‐13Pd Alloy

The microstructure and texture are investigated for nanocrystalline Au‐13at%Pd deformed by high‐pressure torsion. The grain size of this alloy is observed to remain below about 20 nm when subjected to severe plastic deformation. Surprisingly, the initial powder compaction texture does not change significantly during shearing. The results are explained in terms of a grain boundary sliding mechanism involving planar interfaces formed by grain boundary migration. The powder compaction texture ( fiber) of nanocrystalline Au‐13at%Pd alloy and the grain size (below 20 nm) do not change much during high‐pressure torsion. This is explained in terms of a grain boundary sliding mechanism involving planar interfaces formed by grain boundary migration.