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Title: Design of super-strong and thermally stable nanotwinned Al alloys via solute synergy

Abstract

Al alloys have widespread industrial applications. However, their mechanical strength is often much lower than steels. Here, we investigate the influence of solutes on achieving ultrahigh strength and thermal stability of nanotwinned Al alloys. In situ micropillar compression tests show the addition of a small amount of Ti can significantly increase the mechanical strength of Al–Ni alloys to 2 GPa. Deformation induced detwinning, Ni segregation and grain coarsening as discovered in binary Al–Ni alloys are mostly absent in the ternary Al–Ni–Ti alloys. Moreover, the ternary Al–Ni–Ti alloys have outstanding thermal stability. Density function theory calculations reveal the synergetic pinning effect of Ni–Ti solute pairs on incoherent twin boundaries. This study demonstrates that the proper selection of synergistic solute pairs is critical to improve the thermal stability and mechanical properties of nanotwinned Al alloys.

Authors:
ORCiD logo [1];  [1];  [2];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [1];  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1852189
Alternate Identifier(s):
OSTI ID: 1670810
Grant/Contract Number:  
SC0016337
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 12; Journal Issue: 39; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Nanotwins; Al alloys; high strength; thermal stability; density functional theory

Citation Formats

Zhang, Y. F., Su, R., Xie, D. Y., Niu, T. J., Xue, S., Li, Q., Shang, Z., Ding, J., Richter, N. A., Wang, Jian, Wang, H., and Zhang, X. Design of super-strong and thermally stable nanotwinned Al alloys via solute synergy. United States: N. p., 2020. Web. doi:10.1039/d0nr05707j.
Zhang, Y. F., Su, R., Xie, D. Y., Niu, T. J., Xue, S., Li, Q., Shang, Z., Ding, J., Richter, N. A., Wang, Jian, Wang, H., & Zhang, X. Design of super-strong and thermally stable nanotwinned Al alloys via solute synergy. United States. https://doi.org/10.1039/d0nr05707j
Zhang, Y. F., Su, R., Xie, D. Y., Niu, T. J., Xue, S., Li, Q., Shang, Z., Ding, J., Richter, N. A., Wang, Jian, Wang, H., and Zhang, X. Tue . "Design of super-strong and thermally stable nanotwinned Al alloys via solute synergy". United States. https://doi.org/10.1039/d0nr05707j. https://www.osti.gov/servlets/purl/1852189.
@article{osti_1852189,
title = {Design of super-strong and thermally stable nanotwinned Al alloys via solute synergy},
author = {Zhang, Y. F. and Su, R. and Xie, D. Y. and Niu, T. J. and Xue, S. and Li, Q. and Shang, Z. and Ding, J. and Richter, N. A. and Wang, Jian and Wang, H. and Zhang, X.},
abstractNote = {Al alloys have widespread industrial applications. However, their mechanical strength is often much lower than steels. Here, we investigate the influence of solutes on achieving ultrahigh strength and thermal stability of nanotwinned Al alloys. In situ micropillar compression tests show the addition of a small amount of Ti can significantly increase the mechanical strength of Al–Ni alloys to 2 GPa. Deformation induced detwinning, Ni segregation and grain coarsening as discovered in binary Al–Ni alloys are mostly absent in the ternary Al–Ni–Ti alloys. Moreover, the ternary Al–Ni–Ti alloys have outstanding thermal stability. Density function theory calculations reveal the synergetic pinning effect of Ni–Ti solute pairs on incoherent twin boundaries. This study demonstrates that the proper selection of synergistic solute pairs is critical to improve the thermal stability and mechanical properties of nanotwinned Al alloys.},
doi = {10.1039/d0nr05707j},
journal = {Nanoscale},
number = 39,
volume = 12,
place = {United States},
year = {Tue Sep 15 00:00:00 EDT 2020},
month = {Tue Sep 15 00:00:00 EDT 2020}
}

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