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Particle size effects on dislocation density, microstructure, and phase transformation for high-entropy alloy powders

Jeon, Sangho and Liu, Xuanjiang and Azersky, Colby and Ren, Jie and Zhang, Shengbiao and Chen, Wen and Hyers, Robert W. and Costa, Kelly and Kolbe, Matthias and Matson, D. M. (2021) Particle size effects on dislocation density, microstructure, and phase transformation for high-entropy alloy powders. Materialia, 18, p. 101161. Elsevier. doi: 10.1016/j.mtla.2021.101161. ISSN 2589-1529.

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Official URL: https://www.sciencedirect.com/science/article/pii/S2589152921001642

Abstract

Recrystallization and phase transformation reactions are driven by energy stored in the parent phase due to previous processing history. Grain boundaries, lattice strain, and dislocation networks may affect subsequent microstructural evolution, especially during metal powder consolidation processes. In this work, AlCrFe2Ni2 eutectic high-entropy alloy powders over a wide range of size distribution were used to investigate the correlation between dislocation density and microstructure as a function of particle size. Line profile analysis of the X-ray diffraction patterns of the as-received (quenched) samples shows that the dislocation density increases linearly with decreasing particle size. Based on microstructure analysis of the as-quenched and the annealed samples, it is found that the correlation is associated with the grain boundary length which increases with decreasing particle size, revealing that the key source of dislocation density is dislocations within the grain boundaries. The grain boundary energy acts as a driving force for the metastable to stable phase transformation of AlCrFe2Ni2, showing that the phase transformation kinetics is a function of particle size. This work shows a direct experimental observation and quantitative analysis that in metallic powder systems particle size is one of the key parameters which affects the dislocation density and the phase transformation kinetics most probably due to the different cooling rates achieved during powder production.

Item URL in elib:https://elib.dlr.de/143346/
Document Type:Article
Title:Particle size effects on dislocation density, microstructure, and phase transformation for high-entropy alloy powders
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Jeon, SanghoDepartment of Mechanical Engineering, Tufts University, Medford, MA02155, USAUNSPECIFIEDUNSPECIFIED
Liu, XuanjiangDepartment of Mechanical Engineering, Tufts University, Medford, MA02155, USAUNSPECIFIEDUNSPECIFIED
Azersky, ColbyDepartment of Mechanical Engineering, Tufts University, Medford, MA02155, USAUNSPECIFIEDUNSPECIFIED
Ren, JieDepartment of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003-2210, USAUNSPECIFIEDUNSPECIFIED
Zhang, ShengbiaoDepartment of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003-2210, USAUNSPECIFIEDUNSPECIFIED
Chen, WenDepartment of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA 01003-2210, USAUNSPECIFIEDUNSPECIFIED
Hyers, Robert W.University of Massachusetts, Amherst MA, USAUNSPECIFIEDUNSPECIFIED
Costa, KellyHitchiner Manufacturing Co. Inc., Milford, NH 03055, USAUNSPECIFIEDUNSPECIFIED
Kolbe, Matthiasinstitut für materialphysik im weltraum, dlr, kölnUNSPECIFIEDUNSPECIFIED
Matson, D. M.Tufts University, Medfort, MA, USAUNSPECIFIEDUNSPECIFIED
Date:13 July 2021
Journal or Publication Title:Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:18
DOI:10.1016/j.mtla.2021.101161
Page Range:p. 101161
Publisher:Elsevier
ISSN:2589-1529
Status:Published
Keywords:dislocation density, powder alloy, high entropy alloy, X-ray line profile analysis, grain boundaries
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Project EML3
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Kolbe, Matthias
Deposited On:09 Aug 2021 08:41
Last Modified:20 Oct 2023 08:05

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