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Title: Solute stabilization of nanocrystalline tungsten against abnormal grain growth

Journal Article · · Journal of Materials Research
DOI:https://doi.org/10.1557/jmr.2017.296· OSTI ID:1474059
 [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

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.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1474059
Report Number(s):
SAND-2018-10138J; applab; 667935
Journal Information:
Journal of Materials Research, Vol. 33, Issue 01; ISSN 0884-2914
Publisher:
Materials Research SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Cited By (3)

Amorphous Intergranular Films Enable the Creation of Bulk Nanocrystalline Cu–Zr with Full Density journal August 2019
Zr segregation in Ni–Zr alloy: implication on deformation mechanism during shear loading and bending creep journal February 2020
Phase Field Modelling of Abnormal Grain Growth text January 2020