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Title: Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys

Abstract

When a material that contains precipitates is deformed, the precipitates and the matrix may strain plastically by different amounts causing stresses to build up at the precipitate-matrix interfaces. If premature failure is to be avoided, it is therefore essential to reduce the difference in the plastic strain between the two phases. Here, we conduct nanoscale digital image correlation to measure a new variable that quantifies this plastic strain difference and show how its value can be used to estimate the associated interfacial stresses, which are found to be approximately three times greater in an Fe-Ni2AlTi steel than in the more ductile Ni-based superalloy CMSX-4®. It is then demonstrated that decreasing these stresses significantly improves the ability of the Fe-Ni2AlTi microstructure to deform under tensile loads without loss in strength.

Authors:
 [1]; ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [2];  [1]
  1. Univ. of Cambridge (United Kingdom). Gordon Lab. Dept. of Materials Science and Metallurgy
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Dept. of Computational Materials and Data Science
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Cambridge (United Kingdom)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Engineering and Physical Sciences Research Council (EPSRC)
OSTI Identifier:
1469632
Report Number(s):
SAND2018-9738J
Journal ID: ISSN 2045-2322; PII: 26917
Grant/Contract Number:  
NA0003525; EP/M005607/1
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; characterization and analytical techniques; metals and alloys

Citation Formats

Jones, R. D., Di Gioacchino, F., Lim, H., Edwards, T. E. J., Schwalbe, C., Battaile, C. C., and Clegg, W. J. Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys. United States: N. p., 2018. Web. doi:10.1038/s41598-018-26917-0.
Jones, R. D., Di Gioacchino, F., Lim, H., Edwards, T. E. J., Schwalbe, C., Battaile, C. C., & Clegg, W. J. Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys. United States. https://doi.org/10.1038/s41598-018-26917-0
Jones, R. D., Di Gioacchino, F., Lim, H., Edwards, T. E. J., Schwalbe, C., Battaile, C. C., and Clegg, W. J. Wed . "Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys". United States. https://doi.org/10.1038/s41598-018-26917-0. https://www.osti.gov/servlets/purl/1469632.
@article{osti_1469632,
title = {Reduced partitioning of plastic strain for strong and yet ductile precipitate-strengthened alloys},
author = {Jones, R. D. and Di Gioacchino, F. and Lim, H. and Edwards, T. E. J. and Schwalbe, C. and Battaile, C. C. and Clegg, W. J.},
abstractNote = {When a material that contains precipitates is deformed, the precipitates and the matrix may strain plastically by different amounts causing stresses to build up at the precipitate-matrix interfaces. If premature failure is to be avoided, it is therefore essential to reduce the difference in the plastic strain between the two phases. Here, we conduct nanoscale digital image correlation to measure a new variable that quantifies this plastic strain difference and show how its value can be used to estimate the associated interfacial stresses, which are found to be approximately three times greater in an Fe-Ni2AlTi steel than in the more ductile Ni-based superalloy CMSX-4®. It is then demonstrated that decreasing these stresses significantly improves the ability of the Fe-Ni2AlTi microstructure to deform under tensile loads without loss in strength.},
doi = {10.1038/s41598-018-26917-0},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {Wed Jun 06 00:00:00 EDT 2018},
month = {Wed Jun 06 00:00:00 EDT 2018}
}

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