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

Nisha Verma, Nirab Pant, John A. Beach, Julia Ivanisenko, Yinon Ashkenazy, Shen Dillon, Pascal Bellon, Robert S. Averback

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Pages (from-to)218-230
Number of pages13
JournalActa Materialia
Volume170
DOIs
StatePublished - May 15 2019

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Keywords

  • Ball milling
  • Cu ternary alloys
  • Effective temperature model
  • Forced chemical mixing
  • High pressure torsion
  • Severe plastic deformation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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