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Unraveling Thermodynamic and Kinetic Contributions to the Stability of Doped Nanocrystalline Alloys using Nanometallic Multilayers

Journal Article · · Advanced Materials
 [1];  [1];  [2];  [1];  [3];  [4];  [5];  [6]
  1. Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA
  2. Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089 USA
  3. Center for Functional Nanomaterials Brookhaven National Lab Upton NY 11973 USA
  4. Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque NM 87185 USA
  5. Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089 USA, Department of Aerospace and Mechanical Engineering University of Southern California Los Angeles CA 90089 USA
  6. Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA, Institute for Advanced Computational Science Stony Brook University Stony Brook NY 11794 USA

Abstract

Targeted doping of grain boundaries is widely pursued as a pathway for combating thermal instabilities in nanocrystalline metals. However, certain dopants predicted to produce grain‐boundary‐segregated nanocrystalline configurations instead form small nanoprecipitates at elevated temperatures that act to kinetically inhibit grain growth. Here, thermodynamic modeling is implemented to select the Mo–Au system for exploring the interplay between thermodynamic and kinetic contributions to nanostructure stability. Using nanoscale multilayers and in situ transmission electron microscopy thermal aging, evolving segregation states and the corresponding phase transitions are mapped with temperature. The microstructure is shown to evolve through a transformation at lower homologous temperatures (<600 °C) where solute atoms cluster and segregate to the grain boundaries, consistent with predictions from thermodynamic models. An increase in temperature to 800 °C is accompanied by coarsening of the grain structure via grain boundary migration but with multiple pinning events uncovered between migrating segments of the grain boundary and local solute clustering. Direct comparison between the thermodynamic predictions and experimental observations of microstructure evolution thus demonstrates a transition from thermodynamically preferred to kinetically inhibited nanocrystalline stability and provides a general framework for decoupling contributions to complex stability transitions while simultaneously targeting a dominant thermal stability regime.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0021060
OSTI ID:
1871248
Alternate ID(s):
OSTI ID: 1871250
OSTI ID: 1871987
OSTI ID: 1873165
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 27 Vol. 34; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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