skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths

Abstract

The precipitation of nanoparticles plays a key role in determining the properties of many structural materials, and the understanding of their formation and stabilization mechanisms has been a long standing interest in the material field. However, the critical issues involving the group precipitation of various nanoparticles and their cooperative hardening mechanism remain elusive in the newly discovered Fe-based alloys with nanostructures. Here we quantitatively elucidate the nucleation mechanism, evolution kinetics and hardening effects of the group-precipitated nanoparticles in the Fe-Cu-Ni-Al-based alloys by atom probe tomography together with both first-principles and thermodynamic calculations. Our results provide the compelling evidence for two interesting but complex group precipitation pathways of nanoparticles, i.e., the Cu-rich and NiAl-based precipitations. Lastly, the co-existence of the two precipitation pathways plays a key role in age hardening kinetics and ultimately enhances the hardening response, as compared to the single particle type of strengthening, therefore providing an effective new approach for strengthening materials for structural applications.

Authors:
 [1];  [1];  [2];  [1];  [1]
  1. City Univ. of Hong Kong, Hong Kong (China)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); City Univ. of Hong Kong (China)
Sponsoring Org.:
USDOE Office of Science (SC); City Univ. of Hong Kong (China); Research Grant Council, Hong Kong (China)
OSTI Identifier:
1259853
Alternate Identifier(s):
OSTI ID: 1335335
Grant/Contract Number:  
AC05-00OR22725; 9380060; C1027-14E; 11205515
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Jiao, Z. B., Luan, J. H., Miller, M. K., Yu, C. Y., and Liu, C. T. Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths. United States: N. p., 2016. Web. doi:10.1038/srep21364.
Jiao, Z. B., Luan, J. H., Miller, M. K., Yu, C. Y., & Liu, C. T. Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths. United States. doi:10.1038/srep21364.
Jiao, Z. B., Luan, J. H., Miller, M. K., Yu, C. Y., and Liu, C. T. Fri . "Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths". United States. doi:10.1038/srep21364. https://www.osti.gov/servlets/purl/1259853.
@article{osti_1259853,
title = {Group precipitation and age hardening of nanostructured Fe-based alloys with ultra-high strengths},
author = {Jiao, Z. B. and Luan, J. H. and Miller, M. K. and Yu, C. Y. and Liu, C. T.},
abstractNote = {The precipitation of nanoparticles plays a key role in determining the properties of many structural materials, and the understanding of their formation and stabilization mechanisms has been a long standing interest in the material field. However, the critical issues involving the group precipitation of various nanoparticles and their cooperative hardening mechanism remain elusive in the newly discovered Fe-based alloys with nanostructures. Here we quantitatively elucidate the nucleation mechanism, evolution kinetics and hardening effects of the group-precipitated nanoparticles in the Fe-Cu-Ni-Al-based alloys by atom probe tomography together with both first-principles and thermodynamic calculations. Our results provide the compelling evidence for two interesting but complex group precipitation pathways of nanoparticles, i.e., the Cu-rich and NiAl-based precipitations. Lastly, the co-existence of the two precipitation pathways plays a key role in age hardening kinetics and ultimately enhances the hardening response, as compared to the single particle type of strengthening, therefore providing an effective new approach for strengthening materials for structural applications.},
doi = {10.1038/srep21364},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Save / Share: