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Title: Lattice Distortion and Phase Stability of Pd-Doped NiCoFeCr Solid-Solution Alloys

Abstract

In the present study, we have revealed that (NiCoFeCr) 100–xPd x (x= 1, 3, 5, 20 atom%) high-entropy alloys (HEAs) have both local- and long-range lattice distortions by utilizing X-ray total scattering, X-ray diffraction, and extended X-ray absorption fine structure methods. The local lattice distortion determined by the lattice constant difference between the local and average structures was found to be proportional to the Pd content. A small amount of Pd-doping (1 atom%) yields long-range lattice distortion, which is demonstrated by a larger (200) lattice plane spacing than the expected value from an average structure, however, the degree of long-range lattice distortion is not sensitive to the Pd concentration. Here, the structural stability of these distorted HEAs under high-pressure was also examined. The experimental results indicate that doping with a small amount of Pd significantly enhances the stability of the fcc phase by increasing the fcc-to-hcp transformation pressure from ~13.0 GPa in NiCoFeCr to 20–26 GPa in the Pd-doped HEAs and NiCoFeCrPd maintains its fcc lattice up to 74 GPa, the maximum pressure that the current experiments have reached.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1484109
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Entropy
Additional Journal Information:
Journal Volume: 20; Journal Issue: 12; Journal ID: ISSN 1099-4300
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; solid-solution alloys; lattice distortion; phase transformation

Citation Formats

Zhang, Fuxiang, Tong, Yang, Jin, Ke, Bei, Hongbin, Weber, William J., and Zhang, Yanwen. Lattice Distortion and Phase Stability of Pd-Doped NiCoFeCr Solid-Solution Alloys. United States: N. p., 2018. Web. doi:10.3390/e20120900.
Zhang, Fuxiang, Tong, Yang, Jin, Ke, Bei, Hongbin, Weber, William J., & Zhang, Yanwen. Lattice Distortion and Phase Stability of Pd-Doped NiCoFeCr Solid-Solution Alloys. United States. doi:10.3390/e20120900.
Zhang, Fuxiang, Tong, Yang, Jin, Ke, Bei, Hongbin, Weber, William J., and Zhang, Yanwen. Sun . "Lattice Distortion and Phase Stability of Pd-Doped NiCoFeCr Solid-Solution Alloys". United States. doi:10.3390/e20120900. https://www.osti.gov/servlets/purl/1484109.
@article{osti_1484109,
title = {Lattice Distortion and Phase Stability of Pd-Doped NiCoFeCr Solid-Solution Alloys},
author = {Zhang, Fuxiang and Tong, Yang and Jin, Ke and Bei, Hongbin and Weber, William J. and Zhang, Yanwen},
abstractNote = {In the present study, we have revealed that (NiCoFeCr)100–xPdx (x= 1, 3, 5, 20 atom%) high-entropy alloys (HEAs) have both local- and long-range lattice distortions by utilizing X-ray total scattering, X-ray diffraction, and extended X-ray absorption fine structure methods. The local lattice distortion determined by the lattice constant difference between the local and average structures was found to be proportional to the Pd content. A small amount of Pd-doping (1 atom%) yields long-range lattice distortion, which is demonstrated by a larger (200) lattice plane spacing than the expected value from an average structure, however, the degree of long-range lattice distortion is not sensitive to the Pd concentration. Here, the structural stability of these distorted HEAs under high-pressure was also examined. The experimental results indicate that doping with a small amount of Pd significantly enhances the stability of the fcc phase by increasing the fcc-to-hcp transformation pressure from ~13.0 GPa in NiCoFeCr to 20–26 GPa in the Pd-doped HEAs and NiCoFeCrPd maintains its fcc lattice up to 74 GPa, the maximum pressure that the current experiments have reached.},
doi = {10.3390/e20120900},
journal = {Entropy},
number = 12,
volume = 20,
place = {United States},
year = {Sun Nov 25 00:00:00 EST 2018},
month = {Sun Nov 25 00:00:00 EST 2018}
}

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