On the process of co-deformation and phase dissolution in a hard-soft immiscible Cu Co alloy system during high-pressure torsion deformation

Deformation‐Induced Supersaturation in Immiscible Material Systems during High‐Pressure Torsion

“…In the Cu-Co composites, it was indeed shown, that the mixing process starts at relatively low strains (e % 30 in the Cu-76 at% Co composite). [58] In APT analyses on Cu-Co, an increased solute content was observed near nanometer sized particles, but no distinct chemical gradients were observed at interfaces, see Figure 10. The lack of intermixing at phase boundaries and the increased solute content behind small particles at low applied strains in Cu-Co can be attributed to a process similar to abrasion, instead of a mixing based on dislocation motion across phase boundaries.…”

“…In the Cu-76 at% Co composite, a homogeneous microstructure is observed, although bands with bright and dark contrast indicate Cuand Co-rich regions. [58] However, homogenous microstructures are reached, if only a small additional amount of strain is applied. The same is observed in the Cu-54 at% Co composite.…”

“…In the saturation regime of deformation, a homogeneous distribution of Cu and Co atoms is observed as confirmed by APT analysis and EELS measurements in the Cu-Co composites (for details see refs. [57,58] ). TEM diffraction data further indicates that a single-phase fcc solid solution has formed in composites with low and high Co content.…”

“…APT analyses at the highest applied strain level gives a local composition of 25.6 at% Co, which is in quite good agreement with the nominal composition of 26 at% Co. For the Cu-76at% Co composite, the average Cu concentration determined by APT is 22-24 at% in Co. [57] The concentration profiles obtained from EELS measurements from the Cu-54 at% Co composite at e % 440, include several grains and show a relatively homogeneous distribution of Cu and Co (for details see ref. [58] ). In the saturation regime of deformation, a homogeneous distribution of Cu and Co atoms is observed as confirmed by APT analysis and EELS measurements in the Cu-Co composites (for details see refs.…”

“…With ongoing deformation, these dislocations arrange to new grain A. Bachmaier studied materials science and is currently doing her Post-doc at the Erich Schmid Institute, Austria. Grain size in saturation [nm] Cu-Ag (fcc-fcc) [53,54] Cu-6/9Ag %355 %30-50 nm Cu-16/22Ag %380 %20-40 nm Cu-37/46Ag %340 %10 nm Cu-26/25Co %280 %100 nm Cu-Co (fcc-hcp) [55][56][57][58] Cu-54/50Co %400 <50 nm Cu-76/75Co %450 <50 nm Cu-17/17Fe %330 <50 nm Cu-Fe (fcc-bcc) [49] Cu-53/53Fe %440 <50 nm Cu-73/73Fe %445 <50 nm Cu-87/87Fe %640 <50 nm Cu-Cr (fcc-bcc) [32,59] Cu-47/47Cr %450 %10-20 nm Ni-6/9Ag %700 %30-50 nm Ni-Ag (fcc-fcc) [60] Ni-19/26Ag %600 %10-20 nm Ni-35/46Ag [61][62][63] Cu-51/58W %550 %5-15 nm boundaries, which subdivide the initial grains and finally transform the material into an UFG structure.…”