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Title: Hierarchical microstructures and deformation behavior of laser direct-metal-deposited Cu–Fe alloys

Abstract

Cu25Fe75 and Cu50Fe50 (nominal composition, at. %) alloys were fabricated using laser direct metal deposition (DMD) based additive manufacturing technique. These alloys exhibit hierarchical microstructures with bi-phasic Cu and Fe dendrites that contain nanoscale precipitates of varying sizes and structures. In the Cu25Fe75 alloy, Fe dendrites contained nanoscale, coherent, metastable BCC Cu and semi-coherent FCC Cu precipitates while the Cu matrix had nanoscale, coherent, metastable FCC Fe precipitates. In the Cu50Fe50 alloy, Fe dendrites only contained nanoscale semi-coherent FCC Cu precipitates while the Cu matrix had nanoscale coherent metastable FCC Fe precipitates. Both alloys exhibited enhanced flow strengths in the range of 750 – 980 MPa and significant plasticity, in compression. Here, the Cu25Fe75 alloy had lower yield strength than Cu50Fe50 alloy but higher maximum compressive strength due to higher strain hardening resulting from slightly coarser dendrites with hierarchy of nanoscale precipitation.

Authors:
 [1];  [1];  [1];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1773377
Alternate Identifier(s):
OSTI ID: 2325376
Grant/Contract Number:  
NA0003857
Resource Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 802; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Cu-Fe alloys; Additive manufacturing; Laser direct-metal-deposition; Hierarchical microstructure; BCC Cu / FCC Fe precipitation; Micropillar compression

Citation Formats

Chatterjee, Arya, Sprague, Ethan, Mazumder, Jyoti, and Misra, Amit. Hierarchical microstructures and deformation behavior of laser direct-metal-deposited Cu–Fe alloys. United States: N. p., 2020. Web. doi:10.1016/j.msea.2020.140659.
Chatterjee, Arya, Sprague, Ethan, Mazumder, Jyoti, & Misra, Amit. Hierarchical microstructures and deformation behavior of laser direct-metal-deposited Cu–Fe alloys. United States. https://doi.org/10.1016/j.msea.2020.140659
Chatterjee, Arya, Sprague, Ethan, Mazumder, Jyoti, and Misra, Amit. Sun . "Hierarchical microstructures and deformation behavior of laser direct-metal-deposited Cu–Fe alloys". United States. https://doi.org/10.1016/j.msea.2020.140659. https://www.osti.gov/servlets/purl/1773377.
@article{osti_1773377,
title = {Hierarchical microstructures and deformation behavior of laser direct-metal-deposited Cu–Fe alloys},
author = {Chatterjee, Arya and Sprague, Ethan and Mazumder, Jyoti and Misra, Amit},
abstractNote = {Cu25Fe75 and Cu50Fe50 (nominal composition, at. %) alloys were fabricated using laser direct metal deposition (DMD) based additive manufacturing technique. These alloys exhibit hierarchical microstructures with bi-phasic Cu and Fe dendrites that contain nanoscale precipitates of varying sizes and structures. In the Cu25Fe75 alloy, Fe dendrites contained nanoscale, coherent, metastable BCC Cu and semi-coherent FCC Cu precipitates while the Cu matrix had nanoscale, coherent, metastable FCC Fe precipitates. In the Cu50Fe50 alloy, Fe dendrites only contained nanoscale semi-coherent FCC Cu precipitates while the Cu matrix had nanoscale coherent metastable FCC Fe precipitates. Both alloys exhibited enhanced flow strengths in the range of 750 – 980 MPa and significant plasticity, in compression. Here, the Cu25Fe75 alloy had lower yield strength than Cu50Fe50 alloy but higher maximum compressive strength due to higher strain hardening resulting from slightly coarser dendrites with hierarchy of nanoscale precipitation.},
doi = {10.1016/j.msea.2020.140659},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = ,
volume = 802,
place = {United States},
year = {Sun Dec 13 00:00:00 EST 2020},
month = {Sun Dec 13 00:00:00 EST 2020}
}

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