Effects of ternary alloy additions on the microstructure of highly immiscible Cu alloys subjected to severe plastic deformation: An evaluation of the effective temperature model

N Verma and N Pant and JA Beach and J Ivanisenko and Y Ashkenazy and S Dillon and P Bellon and RS Averback, ACTA MATERIALIA, 170, 218-230 (2019).

DOI: 10.1016/j.actamat.2019.03.023

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 Cu95Mo05 alloy, Mo nanoparticles are formed, similar to 10 nm in diameter, as part of a steady state microstructure, with less than similar to 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. Published by Elsevier Ltd on behalf of Acta Materialia Inc.

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