Advanced quantification of the site-occupancy in ordered multi-component intermetallics using atom probe tomography

A. J. Breen; F. Theska; B. Lim; S. Primig; S. P. Ringer

doi:10.1016/j.intermet.2022.107538

Advanced quantification of the site-occupancy in ordered multi-component intermetallics using atom probe tomography

A. J. Breen, F. Theska, B. Lim, S. Primig, S. P. Ringer

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

A new experimental method is proposed to quantify the site-occupancy of substitutional solute elements in multi-component intermetallics from atom probe tomography data and is applied to the L1₂ ordered γʹ phase in the top, middle and bottom regions of an electron powder bed fusion produced IN-738LC build. Ti, W and Ta are found to substitute almost exclusively for the β sites. Cr and Mo show mixed behaviour with a higher proportion substituting for the β sites. Co also shows mixed behaviour but with a higher proportion substituting for the α sites. While γʹ maintains an almost constant chemistry and site-preference behaviour throughout the build, the relative site-occupancy ratio is observed to change, particularly for Co and Mo. The results suggest that local changes in thermal history inherent to metal additive manufacturing processes may induce changes to the resultant site-occupancy of γʹ. The method described here improves the experimental quantification of the local atomic site-occupancy, enabling an assessment of the substitutional solute element fractions occurring at the α and β sites in L1₂ ordered structures. This is important in multi-component intermetallics because of the burgeoning interest in relating the elastic and plastic properties of these structures to their site-occupancy.

Original language	English
Article number	107538
Journal	Intermetallics
Volume	145
DOIs	https://doi.org/10.1016/j.intermet.2022.107538
State	Published - Jun 2022
Externally published	Yes

Funding

The authors further acknowledge the facilities, and the scientific and technical assistance of the Microscopy Australia node at the University of Sydney (Sydney Microscopy & Microanalysis). This research was sponsored by the Department of Industry, Innovation and Science under the auspices of the AUSMURI program. S. Primig is supported by the Australian Research Council's DECRA (DE180100440) and the UNSW Scientia Fellowship schemes. The authors acknowledge Dr. Takanori Sato at the University of Sydney for their technical support. Baptiste Gault, Peter Felfer and Vicente Araullo-Peters are acknowledged for contributing to MATLAB code used in this study. Students Christopher Cooper, Cameron Durrant and Yingluo Li are thanked for assistance with the project. The authors further acknowledge the facilities, and the scientific and technical assistance of the Microscopy Australia node at the University of Sydney (Sydney Microscopy & Microanalysis). This research was sponsored by the Department of Industry, Innovation and Science under the auspices of the AUSMURI program. S. Primig is supported by the Australian Research Council's DECRA (DE180100440) and the UNSW Scientia Fellowship schemes. The authors acknowledge Dr. Takanori Sato at the University of Sydney for their technical support. Baptiste Gault, Peter Felfer and Vicente Araullo-Peters are acknowledged for contributing to MATLAB code used in this study. Students Christopher Cooper, Cameron Durrant and Yingluo Li are thanked for assistance with the project.

Keywords

Atom probe tomography
Powder bed fusion
Site-occupancy
Superalloy
γʹ

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10.1016/j.intermet.2022.107538

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title = "Advanced quantification of the site-occupancy in ordered multi-component intermetallics using atom probe tomography",

abstract = "A new experimental method is proposed to quantify the site-occupancy of substitutional solute elements in multi-component intermetallics from atom probe tomography data and is applied to the L12 ordered γʹ phase in the top, middle and bottom regions of an electron powder bed fusion produced IN-738LC build. Ti, W and Ta are found to substitute almost exclusively for the β sites. Cr and Mo show mixed behaviour with a higher proportion substituting for the β sites. Co also shows mixed behaviour but with a higher proportion substituting for the α sites. While γʹ maintains an almost constant chemistry and site-preference behaviour throughout the build, the relative site-occupancy ratio is observed to change, particularly for Co and Mo. The results suggest that local changes in thermal history inherent to metal additive manufacturing processes may induce changes to the resultant site-occupancy of γʹ. The method described here improves the experimental quantification of the local atomic site-occupancy, enabling an assessment of the substitutional solute element fractions occurring at the α and β sites in L12 ordered structures. This is important in multi-component intermetallics because of the burgeoning interest in relating the elastic and plastic properties of these structures to their site-occupancy.",

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AB - A new experimental method is proposed to quantify the site-occupancy of substitutional solute elements in multi-component intermetallics from atom probe tomography data and is applied to the L12 ordered γʹ phase in the top, middle and bottom regions of an electron powder bed fusion produced IN-738LC build. Ti, W and Ta are found to substitute almost exclusively for the β sites. Cr and Mo show mixed behaviour with a higher proportion substituting for the β sites. Co also shows mixed behaviour but with a higher proportion substituting for the α sites. While γʹ maintains an almost constant chemistry and site-preference behaviour throughout the build, the relative site-occupancy ratio is observed to change, particularly for Co and Mo. The results suggest that local changes in thermal history inherent to metal additive manufacturing processes may induce changes to the resultant site-occupancy of γʹ. The method described here improves the experimental quantification of the local atomic site-occupancy, enabling an assessment of the substitutional solute element fractions occurring at the α and β sites in L12 ordered structures. This is important in multi-component intermetallics because of the burgeoning interest in relating the elastic and plastic properties of these structures to their site-occupancy.

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Advanced quantification of the site-occupancy in ordered multi-component intermetallics using atom probe tomography

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