An in situ USAXS–SAXS–WAXS study of precipitate size distribution evolution in a model Ni-based alloy

Andrews, Ross N.; Serio, Joseph A.; Muralidharan, Govindarajan; Ilavsky, Jan

doi:10.1107/S1600576717006446

Title: An in situ USAXS–SAXS–WAXS study of precipitate size distribution evolution in a model Ni-based alloy

Journal Article · Tue May 30 00:00:00 EDT 2017 · Journal of Applied Crystallography (Online)

DOI:https://doi.org/10.1107/S1600576717006446· OSTI ID:1366390

Andrews, Ross N. ^[1]; Serio, Joseph A. ^[2]; Muralidharan, Govindarajan ^[2]; Ilavsky, Jan ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Intermetallic γ' precipitates typically strengthen nickel-based superalloys. The shape, size and spatial distribution of strengthening precipitates critically influence alloy strength, while their temporal evolution characteristics determine the high-temperature alloy stability. Combined ultra-small-, small- and wide-angle X-ray scattering (USAXS–SAXS–WAXS) analysis can be used to evaluate the temporal evolution of an alloy's precipitate size distribution (PSD) and phase structure duringin situheat treatment. Analysis of PSDs from USAXS–SAXS data employs either least-squares fitting of a preordained PSD model or a maximum entropy (MaxEnt) approach, the latter avoidinga prioridefinition of a functional form of the PSD. However, strong low-qscattering from grain boundaries and/or structure factor effects inhibit MaxEnt analysis of typical alloys. Lastly, this work describes the extension of Bayesian–MaxEnt analysis methods to data exhibiting structure factor effects and low-qpower law slopes and demonstrates their use in anin situstudy of precipitate size evolution during heat treatment of a model Ni–Al–Si alloy.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1366390

Journal Information:: Journal of Applied Crystallography (Online), Vol. 50, Issue 3; ISSN 1600-5767

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Review of the Quench Sensitivity of Aluminium Alloys: Analysis of the Kinetics and Nature of Quench-Induced Precipitation Milkereit, Benjamin; Starink, Marco J.; Rometsch, Paul A. Materials, Vol. 12, Issue 24 https://doi.org/10.3390/ma12244083	journal	December 2019
Quantification of Thermal Oxidation in Metallic Glass Powder using Ultra-small Angle X-ray Scattering Paul, Tanaji; Zhang, Linqi; Biswas, Sourabh Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-43317-0	journal	May 2019

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36 MATERIALS SCIENCE
ultra-small-angle X-ray scattering
small-angle X-ray scattering
wide-angle X-ray scattering
USAXS–SAXS–WAXS
precipitation hardening
Bayesian inverse transformation

Title: An in situ USAXS–SAXS–WAXS study of precipitate size distribution evolution in a model Ni-based alloy

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