Journal
MATERIALS TRANSACTIONS
Volume 53, Issue 1, Pages 123-127Publisher
JAPAN INST METALS & MATERIALS
DOI: 10.2320/matertrans.MD201109
Keywords
severe plastic deformation; equal-channel angular pressing; high-pressure torsion; ultrafine grain; electrical conductivity
Funding
- Japan Society for Promotion of Science (JSPS)
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Kyushu University
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Pure Cu (99.99%) is processed by equal-channel angular pressing (ECAP) and by high-pressure torsion (H PT). The electrical resistivity as well as the microhardness increases with an increase in the equivalent strain at an early stage of straining, but saturates to a steady state at the equivalent strains more than similar to 20. At the steady state, the samples processed by ECAP and HPT show a significant increase in the hardness (similar to 270%) but little decrease in the electrical conductivity (similar to 12%) when compared to the annealed state. Transmission electron microscopy confirms that the microstructure does not change at the saturated level with further straining. Evolutions of hardness, electrical conductivity and microstructures are also investigated after post-HPT annealing. [doi:10.2320/matertrans.MD201109]
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