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Title: Grain boundary phase transformations in PtAu and relevance to thermal stabilization of bulk nanocrystalline metals

Journal Article · · Journal of Materials Science

There has recently been a great deal of interest in employing immiscible solutes to stabilize nanocrystalline microstructures. Existing modeling efforts largely rely on mesoscale Monte Carlo approaches that employ a simplified model of the microstructure and result in highly homogeneous segregation to grain boundaries. However, there is ample evidence from experimental and modeling studies that demonstrates segregation to grain boundaries is highly non-uniform and sensitive to boundary character. This work employs a realistic nanocrystalline microstructure with experimentally relevant global solute concentrations to illustrate inhomogeneous boundary segregation. Furthermore, experiments quantifying segregation in thin films are reported that corroborate the prediction that grain boundary segregation is highly inhomogeneous. In addition to grain boundary structure modifying the degree of segregation, the existence of a phase transformation between low and high solute content grain boundaries is predicted. In order to conduct this study, new embedded atom method interatomic potentials are developed for Pt, Au, and the PtAu binary alloy.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1411231
Report Number(s):
SAND-2017-12338J; PII: 1706; TRN: US1800203
Journal Information:
Journal of Materials Science, Vol. 53, Issue 4; ISSN 0022-2461
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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Mechanical properties of stabilized nanocrystalline FCC metals journal September 2019
Density functional theory calculations of generalized stacking fault energy surfaces for eight face-centered cubic transition metals journal September 2019
Segregation-Induced Nanofaceting Transition at an Asymmetric Tilt Grain Boundary in Copper journal December 2018