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Self-organization of Cu–Ag during controlled severe plastic deformation at high temperatures

  • Salman N. Arshad (a1), Timothy G. Lach (a2), Julia Ivanisenko (a3), Daria Setman (a4), Pascal Bellon (a5), Shen J. Dillon (a5) and Robert S. Averback (a5)...

Abstract

Cu90Ag10 alloys were subjected to severe plastic deformation at temperatures ranging from 25 to 400 °C and strain rates ranging from 0.1 to 6.25 s−1 using high-pressure torsion. The deformed samples were characterized by x-ray diffraction, transmission electron microscopy, and atom-probe tomography. A dynamic competition between shear-induced mixing and thermally activated decomposition led to the self-organization of the Cu–Ag system at length scales varying from a few atomic distances at room temperature to ≈50 nm at 400 °C. Steady-state microstructural length scales were minimally affected by varying the strain rate, although at 400 °C, the grain morphology did depend on strain-rate. Our results show that diffusion below 300 °C is dominated by nonequilibrium vacancies, and by comparison with previous Kinetic Monte Carlo simulations [D. Schwen et al., J. Mater. Res. 28, 2687–2693 (2013)], their concentration could be obtained.

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Corresponding author

a) Address all correspondence to this author. e-mail: sdillon@illinois.edu

References

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Keywords

Self-organization of Cu–Ag during controlled severe plastic deformation at high temperatures

  • Salman N. Arshad (a1), Timothy G. Lach (a2), Julia Ivanisenko (a3), Daria Setman (a4), Pascal Bellon (a5), Shen J. Dillon (a5) and Robert S. Averback (a5)...

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