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Title: Deformation mechanisms in amorphous Ni–Mo–P films coated on CoCrFeNi high-entropy alloys

Abstract

The Ni–Mo–P amorphous films were successfully deposited on the CoCrFeNi high-entropy alloys by electroless plating. This work will focus on reviewing and discussing the ambient-temperature mechanical properties, plastic deformation, and cracking mode of the coating-substrate system. The yielding strength (σy) and ultimate tensile strength (UTS) of the specimen plating for 1 h were 260 and 760 MPa, respectively, with 44.4% (σy) and 14.2% (UTS) improvement contrast to the uncoated HEAs (σy and UTS are 180 MPa and 560 MPa, respectively). It is attributed to the back stress and repulsive image stress to suppress the nucleation and mobility of dislocations. Due to the substrate confinement, the deformation model was gradually changed from cracking (with homogeneous flow) to shear banding (with homogeneous flow). Eventually, fully-homogeneous flows occur with reducing the film thickness, and the deformation mechanism map is developed to expound the transition of the deformation mode. The brittle fracture with a high velocity originating from amorphous films leads to cleavage cracking on the surface of the HEA substrate. The thicker film has higher crack velocity and causes deeper cracks penetration into the substrate, reducing the substrate ductility.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1]
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  1. Taiyuan Univ. of Technology (China)
  2. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States); Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1799739
Alternate Identifier(s):
OSTI ID: 1702874
Grant/Contract Number:  
FE0008855; FE0011194; FE0024054; FE-0008855; FE-0024054; FE-0011194
Resource Type:
Accepted Manuscript
Journal Name:
Intermetallics
Additional Journal Information:
Journal Volume: 114; Journal ID: ISSN 0966-9795
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high-entropy alloy; mechanical behavior; deformation mechanisms; Ni–Mo–P amorphous films; shear bands; fracture

Citation Formats

Song, X. T., Guo, R. P., Wang, Z., Wang, X. J., Yang, H. J., Qiao, J. W., Han, L. N., Liaw, P. K., and Wu, Y. C. Deformation mechanisms in amorphous Ni–Mo–P films coated on CoCrFeNi high-entropy alloys. United States: N. p., 2019. Web. doi:10.1016/j.intermet.2019.106591.
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Song, X. T., Guo, R. P., Wang, Z., Wang, X. J., Yang, H. J., Qiao, J. W., Han, L. N., Liaw, P. K., & Wu, Y. C. Deformation mechanisms in amorphous Ni–Mo–P films coated on CoCrFeNi high-entropy alloys. United States. https://doi.org/10.1016/j.intermet.2019.106591
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Song, X. T., Guo, R. P., Wang, Z., Wang, X. J., Yang, H. J., Qiao, J. W., Han, L. N., Liaw, P. K., and Wu, Y. C. Wed . "Deformation mechanisms in amorphous Ni–Mo–P films coated on CoCrFeNi high-entropy alloys". United States. https://doi.org/10.1016/j.intermet.2019.106591. https://www.osti.gov/servlets/purl/1799739.
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@article{osti_1799739,
title = {Deformation mechanisms in amorphous Ni–Mo–P films coated on CoCrFeNi high-entropy alloys},
author = {Song, X. T. and Guo, R. P. and Wang, Z. and Wang, X. J. and Yang, H. J. and Qiao, J. W. and Han, L. N. and Liaw, P. K. and Wu, Y. C.},
abstractNote = {The Ni–Mo–P amorphous films were successfully deposited on the CoCrFeNi high-entropy alloys by electroless plating. This work will focus on reviewing and discussing the ambient-temperature mechanical properties, plastic deformation, and cracking mode of the coating-substrate system. The yielding strength (σy) and ultimate tensile strength (UTS) of the specimen plating for 1 h were 260 and 760 MPa, respectively, with 44.4% (σy) and 14.2% (UTS) improvement contrast to the uncoated HEAs (σy and UTS are 180 MPa and 560 MPa, respectively). It is attributed to the back stress and repulsive image stress to suppress the nucleation and mobility of dislocations. Due to the substrate confinement, the deformation model was gradually changed from cracking (with homogeneous flow) to shear banding (with homogeneous flow). Eventually, fully-homogeneous flows occur with reducing the film thickness, and the deformation mechanism map is developed to expound the transition of the deformation mode. The brittle fracture with a high velocity originating from amorphous films leads to cleavage cracking on the surface of the HEA substrate. The thicker film has higher crack velocity and causes deeper cracks penetration into the substrate, reducing the substrate ductility.},
doi = {10.1016/j.intermet.2019.106591},
journal = {Intermetallics},
number = ,
volume = 114,
place = {United States},
year = {Wed Sep 18 00:00:00 EDT 2019},
month = {Wed Sep 18 00:00:00 EDT 2019}
}
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