Spectral sampling of boron diffusion in Ni alloys: Cr and Mo effects on bulk and grain boundary transport

Authors

Tyler D. Doležal, Air Force Institute of Technology
Rodrigo Freitas, Massachusetts Institute of Technology
Ju Li, Massachusetts Institute of Technology

Document Type

Article

Publication Date

1-2-2026

Department

Department of Engineering Physics

School or Division

The Civil Engineering School

Digital Object Identifier

10.1016/j.actamat.2025.121841

Source Publication

Acta Materialia (ISSN 1359-6454 | eISSN 1873-2453)

Abstract

Excerpt: Understanding how light interstitials migrate in chemically complex alloys is essential for predicting defect dynamics and long-term stability. Here, we introduce a spectral sampling framework to quantify boron diffusion activation energies in Ni and demonstrate how substitutional solutes (Cr, Mo) reshape interstitial point defect transport in both the bulk and along crystallographic defects. In the bulk, boron migration energy distributions exhibit distinct modality tied to solute identity and spatial arrangement: both Cr and Mo raise barriers in symmetric cages but induce directional asymmetry in partially decorated environments.

Comments

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Recommended Citation

Doležal, T. D., Freitas, R., & Li, J. (2026). Spectral sampling of boron diffusion in Ni alloys: Cr and Mo effects on bulk and grain boundary transport. Acta Materialia, 305, 121841. https://doi.org/10.1016/j.actamat.2025.121841