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Title: Solute stabilization of nanocrystalline tungsten against abnormal grain growth

Abstract

Microstructure and phase evolution in magnetron sputtered nanocrystalline tungsten and tungsten alloy thin films are explored through in situ TEM annealing experiments at temperatures up to 1000 °C. Grain growth in unalloyed nanocrystalline tungsten transpires through a discontinuous process at temperatures up to 550 °C, which is coupled to an allotropic phase transformation of metastable β-tungsten with the A-15 cubic structure to stable body centered cubic (BCC) α-tungsten. Complete transformation to the BCC α-phase is accompanied by the convergence to a unimodal nanocrystalline structure at 650 °C, signaling a transition to continuous grain growth. Alloy films synthesized with compositions of W–20 at.% Ti and W–15 at.% Cr exhibit only the BCC α-phase in the as-deposited state, which indicate the addition of solute stabilizes the films against the formation of metastable β-tungsten. Thermal stability of the alloy films is significantly improved over their unalloyed counterpart up to 1000 °C, and grain coarsening occurs solely through a continuous growth process. The contrasting thermal stability between W–Ti and W–Cr is attributed to different grain boundary segregation states, thus demonstrating the critical role of grain boundary chemistry in the design of solute-stabilized nanocrystalline alloys.

Authors:
 [1];  [2];  [3];  [3];  [1]
  1. Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Dept. of Radiation Solid Interactions
  3. Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Metallurgical and Materials Engineering
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1474059
Report Number(s):
SAND-2018-10138J
Journal ID: ISSN 0884-2914; applab; 667935
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 33; Journal Issue: 01; Journal ID: ISSN 0884-2914
Publisher:
Materials Research Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Donaldson, Olivia K., Hattar, Khalid, Kaub, Tyler, Thompson, Gregory B., and Trelewicz, Jason R. Solute stabilization of nanocrystalline tungsten against abnormal grain growth. United States: N. p., 2017. Web. doi:10.1557/jmr.2017.296.
Donaldson, Olivia K., Hattar, Khalid, Kaub, Tyler, Thompson, Gregory B., & Trelewicz, Jason R. Solute stabilization of nanocrystalline tungsten against abnormal grain growth. United States. doi:10.1557/jmr.2017.296.
Donaldson, Olivia K., Hattar, Khalid, Kaub, Tyler, Thompson, Gregory B., and Trelewicz, Jason R. Tue . "Solute stabilization of nanocrystalline tungsten against abnormal grain growth". United States. doi:10.1557/jmr.2017.296. https://www.osti.gov/servlets/purl/1474059.
@article{osti_1474059,
title = {Solute stabilization of nanocrystalline tungsten against abnormal grain growth},
author = {Donaldson, Olivia K. and Hattar, Khalid and Kaub, Tyler and Thompson, Gregory B. and Trelewicz, Jason R.},
abstractNote = {Microstructure and phase evolution in magnetron sputtered nanocrystalline tungsten and tungsten alloy thin films are explored through in situ TEM annealing experiments at temperatures up to 1000 °C. Grain growth in unalloyed nanocrystalline tungsten transpires through a discontinuous process at temperatures up to 550 °C, which is coupled to an allotropic phase transformation of metastable β-tungsten with the A-15 cubic structure to stable body centered cubic (BCC) α-tungsten. Complete transformation to the BCC α-phase is accompanied by the convergence to a unimodal nanocrystalline structure at 650 °C, signaling a transition to continuous grain growth. Alloy films synthesized with compositions of W–20 at.% Ti and W–15 at.% Cr exhibit only the BCC α-phase in the as-deposited state, which indicate the addition of solute stabilizes the films against the formation of metastable β-tungsten. Thermal stability of the alloy films is significantly improved over their unalloyed counterpart up to 1000 °C, and grain coarsening occurs solely through a continuous growth process. The contrasting thermal stability between W–Ti and W–Cr is attributed to different grain boundary segregation states, thus demonstrating the critical role of grain boundary chemistry in the design of solute-stabilized nanocrystalline alloys.},
doi = {10.1557/jmr.2017.296},
journal = {Journal of Materials Research},
number = 01,
volume = 33,
place = {United States},
year = {2017},
month = {9}
}

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Cited by: 4 works
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