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Title: Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility

Abstract

A single phase, face-centered-cubic (FCC) Al 0.3CoCrFeNi high entropy alloy usually has low yield strength. Here, a precipitate-strengthened Al 0.3CoCrFeNi has been developed, exhibiting enhanced yield strength while retaining good ductility, which is attributed to a novel microstructure comprising a finely distributed, needle-like B2 phase within the grains of the FCC matrix and a granular σ phase along the grain boundaries. Such a microstructure was obtained by a two-step heat treatment of an as-cast Al 0.3CoCrFeNi, whose parameters were determined by integrating CALPHAD-based thermodynamic calculations with microstructural characterization by atom probe tomography. In situ neutron diffraction, in conjunction with crystal-plasticity finite-element simulations, has revealed the strengthening effect owing to the load partitioning between the constituent phases. Here, this work has important implications for understanding phase stability and deformation mechanisms in multi-principal component alloys, and paves the way for developing novel microstructures in complex alloys using correlative techniques.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [1];  [1];  [1];  [3]; ORCiD logo [2]; ORCiD logo [2];  [1]; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. CompuTherm LLC, Middleton, WI (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:
1560511
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 742; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; High entropy alloys; Tensile strength; Atom probe tomography; In situ neutron diffraction; Thermodynamic calculations

Citation Formats

Diao, Haoyan, Ma, Dong, Feng, Rui, Liu, Tingkun, Pu, Chao, Zhang, Chuan, Guo, Wei, Poplawsky, Jonathan D., Gao, Yanfei, and Liaw, Peter K. Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility. United States: N. p., 2018. Web. doi:10.1016/j.msea.2018.11.055.
Diao, Haoyan, Ma, Dong, Feng, Rui, Liu, Tingkun, Pu, Chao, Zhang, Chuan, Guo, Wei, Poplawsky, Jonathan D., Gao, Yanfei, & Liaw, Peter K. Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility. United States. doi:10.1016/j.msea.2018.11.055.
Diao, Haoyan, Ma, Dong, Feng, Rui, Liu, Tingkun, Pu, Chao, Zhang, Chuan, Guo, Wei, Poplawsky, Jonathan D., Gao, Yanfei, and Liaw, Peter K. Tue . "Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility". United States. doi:10.1016/j.msea.2018.11.055. https://www.osti.gov/servlets/purl/1560511.
@article{osti_1560511,
title = {Novel NiAl-strengthened high entropy alloys with balanced tensile strength and ductility},
author = {Diao, Haoyan and Ma, Dong and Feng, Rui and Liu, Tingkun and Pu, Chao and Zhang, Chuan and Guo, Wei and Poplawsky, Jonathan D. and Gao, Yanfei and Liaw, Peter K.},
abstractNote = {A single phase, face-centered-cubic (FCC) Al0.3CoCrFeNi high entropy alloy usually has low yield strength. Here, a precipitate-strengthened Al0.3CoCrFeNi has been developed, exhibiting enhanced yield strength while retaining good ductility, which is attributed to a novel microstructure comprising a finely distributed, needle-like B2 phase within the grains of the FCC matrix and a granular σ phase along the grain boundaries. Such a microstructure was obtained by a two-step heat treatment of an as-cast Al0.3CoCrFeNi, whose parameters were determined by integrating CALPHAD-based thermodynamic calculations with microstructural characterization by atom probe tomography. In situ neutron diffraction, in conjunction with crystal-plasticity finite-element simulations, has revealed the strengthening effect owing to the load partitioning between the constituent phases. Here, this work has important implications for understanding phase stability and deformation mechanisms in multi-principal component alloys, and paves the way for developing novel microstructures in complex alloys using correlative techniques.},
doi = {10.1016/j.msea.2018.11.055},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 742,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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