Deposition-controlled phase separation in CuNb metallic alloys

Derby, Benjamin K.; Gomez-Hurtado, Lucia R.; Copeland, Guild; Hattar, Khalid; Briggs, Samuel

doi:10.1016/j.tsf.2023.140083

Title: Deposition-controlled phase separation in CuNb metallic alloys

Journal Article · 03 November 2023 · Thin Solid Films

DOI: https://doi.org/10.1016/j.tsf.2023.140083 · OSTI ID:2228653

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Oregon State Univ., Corvallis, OR (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oregon State Univ., Corvallis, OR (United States); Univ. of Tennessee, Knoxville, TN (United States)

Vapor co-deposited metal nanocomposites with immiscible components have shown to have several superior properties including mechanical performance, radiation tolerance, and enhanced functionalities. The morphology and structural design of these nanocomposites are important in determining the expression of these properties. The conditions used to deposit thin film nanocomposites are the governing factors in determining the final nanostructure. In this work, we link the effects of process gas pressure, substrate temperature, and sputtering target power on resultant Cu/Nb thin film nanostructures. Here, we find that for films with equiatomic phase fractions of Cu and Nb, inhomogeneous precipitate segregation dominated the structure at lower substrate temperature depositions while higher temperatures distributed the Cu and Nb phases more uniformly. Increasing process gas pressure during deposition lead to a spatially homogeneous, nanocrystalline structure of Cu/Nb. In situ annealing of this sample shows that the phase separated morphology of the two immiscible materials depends on the initial composition. Finally, compositions of Cu and Nb that were highly disparate lead to interface segregation of the minority phase. The morphological evolution observed in the Cu/Nb system is compatible with modified structural zone models for immiscible thin film systems.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: 89233218CNA000001; NA0003525

OSTI ID:: 2228653

Alternate ID(s):: OSTI ID: 2212795

Report Number(s):: LA-UR--22-32175

Journal Information:: Thin Solid Films, Journal Name: Thin Solid Films Vol. 787; ISSN 0040-6090

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Immiscibility
Phase-separation
In situ transmission electron microscopy
Deposition conditions
Thin films
Sputtering

Title: Deposition-controlled phase separation in CuNb metallic alloys

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