English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Grain boundary segregation induced precipitation in a non equiatomic nanocrystalline CoCuFeMnNi compositionally complex alloy

Mantha, L. S., MacDonald, B. E., Mu, X., Mazilkin, A., Ivanisenko, J., Hahn, H., et al. (2021). Grain boundary segregation induced precipitation in a non equiatomic nanocrystalline CoCuFeMnNi compositionally complex alloy. Acta Materialia, 220: 117281. doi:10.1016/j.actamat.2021.117281.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Mantha, Lakshmi Sravani1, 2, Author
MacDonald, Benjamin E.3, Author              
Mu, Xiaoke1, Author
Mazilkin, Andrey1, Author
Ivanisenko, Julia1, Author
Hahn, Horst2, 4, 5, Author              
Lavernia, Enrique J.6, Author              
Katnagallu, Shyam7, 8, Author              
Kübel, Christian1, 2, 9, Author              
Affiliations:
1Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von- Helmholtz Platz 1, Eggenstein-Leopoldshafen 76344, Germany, 2, ou_persistent22              
2Department of Materials Science, Technical University Darmstadt, Otto-Berndt-Str. 3, Darmstadt 64206, Germany, ou_persistent22              
3Department of Materials Science and Engineering, University of California, Irvine, CA, USA, ou_persistent22              
4Institute of Nanotechnology, Karlsruhe Institute of Technology, Hermann-von- Helmholtz Platz 1, Eggenstein-Leopoldshafen 76344, Germany, ou_persistent22              
5Department of Materials Science and Engineering, University of California, 544 Engineering Tower, Irvine, CA 92697, USA, ou_persistent22              
6Department of Chemical Engineering and Materials Science, University of California, Irvine, CA, USA, ou_persistent22              
7Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
8Karlsruhe Institute of Technology, Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, Gebäude 640, 76344, Eggenstein-Leopoldshafen, Germany, ou_persistent22              
9Karlsruhe Nano Micro Facil, D-76344 Eggenstein Leopoldshafen, Germany, ou_persistent22              

Content

show
hide
Free keywords: Binary alloys; Cobalt; Cobalt metallography; Copper alloys; Copper metallography; Crystal orientation; Grain boundaries; Grain growth; High resolution transmission electron microscopy; In situ processing; Iron; Iron metallography; Manganese; Manganese metallography; Nanocrystals; Nickel; Nickel metallography; Precipitation (chemical); Segregation (metallography); Torsional stress; Transmissions, Atom-probe tomography; Coarse-grained materials; Crystal orientation mappings; Energy filtered transmission electron microscopy; Grain boundary segregation; High pressure torsions; Nanocrystalline state; Orientation relationship, Nanocrystalline alloys
 Abstract: Compositionally complex alloys (CCAs) in a nanocrystalline state often involve complex and poorly understood phase transformations which can consequently result in grain growth even at low temperatures. A detailed study of the microstructure and phase stability in CCAs is challenging due to the presence of multiple principal components. In view of these challenges the objective of the present study is to establish a systematic understanding of the phase evolution in a face centered cubic non equiatomic nanocrystalline CCA (CoCuFeMnNi). To accomplish this objective, we employed in-situ transmission electron microscope heating in combination with automated crystal orientation mapping (ACOM) and energy filtered transmission electron microscopy (EFTEM) to elucidate the sequence of phase decomposition of the high-pressure torsion (HPT) processed CoCuFeMnNi. Our analysis reveals a complex succession of grain boundary segregation and depletion steps leading to the formation of a FeCo-rich secondary phase. Our results show that prior to the formation of the secondary phase, Cu, Ni and Co segregate and Fe and Mn deplete at the grain boundaries. After the FeCo precipitation is triggered, Mn segregates to the grain boundaries along with Ni and Cu, whereas Fe and Co are depleted. The FeCo precipitates have a B2 crystal structure and typically exhibit a Kurdjumov-Sachs (K-S) and/or Nishyama-Wasserman (N-W) orientation relationships with adjacent fcc grains. Ex-situ heat treated CoCuFeMnNi analyzed by atom probe tomography (APT) revealed a highly heterogeneous segregation of the different elements to different grain boundaries. The FeCo-rich precipitates contain trace amounts of Ni, whereas Cu is rejected leading to the formation of a separate Cu rich phase. This complex segregation phenomenon is assisted by the high fraction of grain boundaries and triple junctions in the nanocrystalline material, which are critical for the phase evolution in this alloy, which is not frequently observed in the corresponding coarse-grained material. © 2021 Acta Materialia Inc.

Details

show
hide
Language(s):
 Dates: 2021
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actamat.2021.117281
BibTex Citekey: Mantha2021
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 220 Sequence Number: 117281 Start / End Page: - Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100