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Title: Disordered interfaces enable high temperature thermal stability and strength in a nanocrystalline aluminum alloy

Abstract

Lightweighting of structural materials has proven indispensable in the energy economy, predicated on alloy design with high strength-to-weight ratios. Modern aluminum alloys have made great strides in ambient temperature performance and are amenable to advanced manufacturing routes such as additive manufacturing, but lack elevated temperature robustness where gains in efficiency can be obtained. Here, we demonstrate the intentional design of disorder at interfaces, a notion generally associated with thermal runaway in traditional materials, in a segregation-engineered ternary nanocrystalline Al-Ni-Ce alloy that exhibits exceptional thermal stability and elevated temperature strength. In-situ transmission electron microscopy in concert with ultrafast calorimetry and X-ray total scattering point to synergistic co-segregation of Ce and Ni driving the evolution of amorphous intergranular films separating sub-10 nm Al-rich grains, which gives rise to emergent thermal stability. We ascribe this intriguing behavior to near-equilibrium interface conditions followed by kinetically sluggish intermetallic precipitation in the confined disordered region. Here, the resulting outstanding mechanical performance at high homologous temperatures lends credence to the efficacy of promoting disorder in alloy design and discovery.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [1]; ORCiD logo [4];  [5]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [2];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Montanuniversität Leoben (Austria)
  3. Stony Brook Univ., NY (United States)
  4. Karlsruhe Inst. of Technology (Germany)
  5. Univ. of California, Irvine, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Irvine, CA (United States); Univ. of California, Santa Barbara, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
OSTI Identifier:
1811698
Alternate Identifier(s):
OSTI ID: 1783569; OSTI ID: 1797524
Grant/Contract Number:  
EE0009114; SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 215; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Grain boundaries; Nanocrystalline metals; Amorphous intergranular films; Thermal stability

Citation Formats

Balbus, Glenn H., Kappacher, Johann, Sprouster, David J., Wang, Fulin, Shin, Jungho, Eggeler, Yolita M., Rupert, Timothy J., Trelewicz, Jason R., Kiener, Daniel, Maier-Kiener, Verena, and Gianola, Daniel S. Disordered interfaces enable high temperature thermal stability and strength in a nanocrystalline aluminum alloy. United States: N. p., 2021. Web. doi:10.1016/j.actamat.2021.116973.
Balbus, Glenn H., Kappacher, Johann, Sprouster, David J., Wang, Fulin, Shin, Jungho, Eggeler, Yolita M., Rupert, Timothy J., Trelewicz, Jason R., Kiener, Daniel, Maier-Kiener, Verena, & Gianola, Daniel S. Disordered interfaces enable high temperature thermal stability and strength in a nanocrystalline aluminum alloy. United States. https://doi.org/10.1016/j.actamat.2021.116973
Balbus, Glenn H., Kappacher, Johann, Sprouster, David J., Wang, Fulin, Shin, Jungho, Eggeler, Yolita M., Rupert, Timothy J., Trelewicz, Jason R., Kiener, Daniel, Maier-Kiener, Verena, and Gianola, Daniel S. Sat . "Disordered interfaces enable high temperature thermal stability and strength in a nanocrystalline aluminum alloy". United States. https://doi.org/10.1016/j.actamat.2021.116973. https://www.osti.gov/servlets/purl/1811698.
@article{osti_1811698,
title = {Disordered interfaces enable high temperature thermal stability and strength in a nanocrystalline aluminum alloy},
author = {Balbus, Glenn H. and Kappacher, Johann and Sprouster, David J. and Wang, Fulin and Shin, Jungho and Eggeler, Yolita M. and Rupert, Timothy J. and Trelewicz, Jason R. and Kiener, Daniel and Maier-Kiener, Verena and Gianola, Daniel S.},
abstractNote = {Lightweighting of structural materials has proven indispensable in the energy economy, predicated on alloy design with high strength-to-weight ratios. Modern aluminum alloys have made great strides in ambient temperature performance and are amenable to advanced manufacturing routes such as additive manufacturing, but lack elevated temperature robustness where gains in efficiency can be obtained. Here, we demonstrate the intentional design of disorder at interfaces, a notion generally associated with thermal runaway in traditional materials, in a segregation-engineered ternary nanocrystalline Al-Ni-Ce alloy that exhibits exceptional thermal stability and elevated temperature strength. In-situ transmission electron microscopy in concert with ultrafast calorimetry and X-ray total scattering point to synergistic co-segregation of Ce and Ni driving the evolution of amorphous intergranular films separating sub-10 nm Al-rich grains, which gives rise to emergent thermal stability. We ascribe this intriguing behavior to near-equilibrium interface conditions followed by kinetically sluggish intermetallic precipitation in the confined disordered region. Here, the resulting outstanding mechanical performance at high homologous temperatures lends credence to the efficacy of promoting disorder in alloy design and discovery.},
doi = {10.1016/j.actamat.2021.116973},
journal = {Acta Materialia},
number = ,
volume = 215,
place = {United States},
year = {Sat May 08 00:00:00 EDT 2021},
month = {Sat May 08 00:00:00 EDT 2021}
}

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