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Stability of binary nanocrystalline alloys against grain growth and phase separation

Journal Article · · Acta Materialia
 [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
Grain boundary segregation has been established through both simulation and experiments as a successful approach to stabilize nanocrystalline materials against grain growth. However, relatively few alloy systems have been studied in this context; these vary in their efficacy, and in many cases the stabilization effect is compromised by second phase precipitation. We address the open-ended design problem of how to select alloy systems that may be stable in a nanocrystalline state. We continue the development of a general “regular nanocrystalline solution” model to identify the conditions under which binary nanocrystalline alloy systems with positive heats of mixing are stable with respect to both grain growth (segregation removes the grain boundary energy penalty) and phase separation (the free energy of the nanocrystalline system is lower than the common tangent defining the bulk miscibility gap). We calculate a “nanostructure stability map” in terms of alloy thermodynamic parameters. Three main regions are delineated in these maps: one where grain boundary segregation does not result in a stabilized nanocrystalline structure, one in which macroscopic phase separation would be preferential (despite the presence of a nanocrystalline state stable against grain growth) and one for which the nanocrystalline state is stable against both grain growth and phase separation. Additional details about the stabilized structures are also presented in the map, which can be regarded as a tool for the design of stable nanocrystalline alloys.
Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001299
OSTI ID:
1381964
Alternate ID(s):
OSTI ID: 1105288
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Journal Issue: 6 Vol. 61; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

Inhibition of Grain Growth by a Ce-rich Precipitate During the Annealing of Spray-Casted Magnesium Alloy journal March 2019
Simultaneous Enhancement of Mechanical and Magnetic Properties in Extremely-Fine Nanograined Ni-P Alloys journal October 2018
Achieving Ultralow Wear with Stable Nanocrystalline Metals journal June 2018
Review of thermal stability of nanomaterials journal November 2013
Nanocrystalline Materials at Equilibrium: A Thermodynamic Review journal September 2015
The thermal stability of the nanograin structure in a weak solute segregation system journal January 2017
Mechanical properties of stabilized nanocrystalline FCC metals journal September 2019
Thermal stability of nanocrystalline materials: thermodynamics and kinetics journal November 2016
Development of a semi-empirical potential for simulation of Ni solute segregation into grain boundaries in Ag journal September 2018
Lower bound on grain boundary solubility in immiscible alloys journal February 2019
Thermodynamics of stable nanocrystalline alloys: A Monte Carlo analysis journal February 2014
Thermodynamic stabilization of precipitates through interface segregation: Chemical effects journal September 2017
Recent trends and open questions in grain boundary segregation journal July 2018
Theoretical Assessment of Thermodynamic Stability in Nanocrystalline Metallic Alloys journal October 2019

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