Phase evolution in dilute, strongly immiscible Cu-Mo, Cu-Mo-Ni, and Cu-Mo-Ag alloys during severe plastic deformation at low-temperature has been experimentally investigated. For the Cu 95 Mo 05 alloy, Mo nanoparticles are formed, ∼10 nm in diameter, as part of a steady state microstructure, with less than ∼1 at.% Mo dissolved in the matrix. Addition of 10 or 20 at.% Ni to this binary alloy results in a significant increase in the Mo solubility, whereas comparable additions of Ag has a corresponding little effect. The steady state microstructures of alloys during ball milling of elemental powders are very similar to those during HPT processing of initially homogeneous solutions. The results are discussed in terms of an effective temperature model. Model MD simulations are presented to help relate the predictions of the effective temperature model to atomistic mechanisms.
Bibliographical noteFunding Information:
The work was supported by the grant DEFG02-05ER46217 funded by the U.S. Department of Energy , Office of Basic Energy Sciences , and made use of the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois.
- Ball milling
- Cu ternary alloys
- Effective temperature model
- Forced chemical mixing
- High pressure torsion
- Severe plastic deformation