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Title: Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys

Abstract

As one of the core effects on the high-temperature structural stability, the so-called “sluggish diffusion effect” in high-entropy alloy (HEA) has attracted much attention. Experimental investigations on the diffusion kinetics have been carried out in a few HEA systems, such as Al-Co-Cr-Fe-Ni and Co-Cr-Fe-Mn-Ni. However, the mechanisms behind this effect remain unclear. To better understand the diffusion kinetics of the HEAs, a combined computational/experimental approach is employed in the current study. In the present work, a self-consistent atomic mobility database is developed for the face-centered cubic (fcc) phase of the Co-Cr-Fe-Mn-Ni quinary system. The simulated diffusion coefficients and concentration profiles using this database can well describe the experimental data both from this work and the literatures. The validated mobility database is then used to calculate the tracer diffusion coefficients of Ni in the subsystems of the Co-Cr-Fe-Mn-Ni system with equiatomic ratios. The comparisons of these calculated diffusion coefficients reveal that the diffusion of Ni is not inevitably more sluggish with increasing number of components in the subsystem even with homologous temperature. Taking advantage of computational thermodynamics, the diffusivities of alloying elements with composition and/or temperature are also calculated. Furthermore, these calculations provide us an overall picture of the diffusion kineticsmore » within the Co-Cr-Fe-Mn-Ni system.« less

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [1];  [1];  [1];  [1]
  1. CompuTherm LLC, Middleton, WI (United States)
  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)
Sponsoring Org.:
USDOE
OSTI Identifier:
1400198
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Phase Equilibria and Diffusion
Additional Journal Information:
Journal Volume: 38; Journal Issue: 4; Journal ID: ISSN 1547-7037
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; atomic mobility database; CALPHAD; computational thermodynamics; high entropy alloy; sluggish diffusivity; solid solution alloy

Citation Formats

Zhang, Chuan, Zhang, Fan, Jin, Ke, Bei, Hongbin, Chen, Shuanglin, Cao, Weisheng, Zhu, Jun, and Lv, Duchao. Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys. United States: N. p., 2017. Web. doi:10.1007/s11669-017-0580-5.
Zhang, Chuan, Zhang, Fan, Jin, Ke, Bei, Hongbin, Chen, Shuanglin, Cao, Weisheng, Zhu, Jun, & Lv, Duchao. Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys. United States. doi:10.1007/s11669-017-0580-5.
Zhang, Chuan, Zhang, Fan, Jin, Ke, Bei, Hongbin, Chen, Shuanglin, Cao, Weisheng, Zhu, Jun, and Lv, Duchao. Thu . "Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys". United States. doi:10.1007/s11669-017-0580-5.
@article{osti_1400198,
title = {Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys},
author = {Zhang, Chuan and Zhang, Fan and Jin, Ke and Bei, Hongbin and Chen, Shuanglin and Cao, Weisheng and Zhu, Jun and Lv, Duchao},
abstractNote = {As one of the core effects on the high-temperature structural stability, the so-called “sluggish diffusion effect” in high-entropy alloy (HEA) has attracted much attention. Experimental investigations on the diffusion kinetics have been carried out in a few HEA systems, such as Al-Co-Cr-Fe-Ni and Co-Cr-Fe-Mn-Ni. However, the mechanisms behind this effect remain unclear. To better understand the diffusion kinetics of the HEAs, a combined computational/experimental approach is employed in the current study. In the present work, a self-consistent atomic mobility database is developed for the face-centered cubic (fcc) phase of the Co-Cr-Fe-Mn-Ni quinary system. The simulated diffusion coefficients and concentration profiles using this database can well describe the experimental data both from this work and the literatures. The validated mobility database is then used to calculate the tracer diffusion coefficients of Ni in the subsystems of the Co-Cr-Fe-Mn-Ni system with equiatomic ratios. The comparisons of these calculated diffusion coefficients reveal that the diffusion of Ni is not inevitably more sluggish with increasing number of components in the subsystem even with homologous temperature. Taking advantage of computational thermodynamics, the diffusivities of alloying elements with composition and/or temperature are also calculated. Furthermore, these calculations provide us an overall picture of the diffusion kinetics within the Co-Cr-Fe-Mn-Ni system.},
doi = {10.1007/s11669-017-0580-5},
journal = {Journal of Phase Equilibria and Diffusion},
number = 4,
volume = 38,
place = {United States},
year = {Thu Jul 13 00:00:00 EDT 2017},
month = {Thu Jul 13 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
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