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

Haoyan Diao; Dong Ma; Rui Feng; Tingkun Liu; Chao Pu; Chuan Zhang; Wei Guo; Jonathan D. Poplawsky; Yanfei Gao; Peter K. Liaw

doi:10.1016/j.msea.2018.11.055

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

Haoyan Diao, Dong Ma, Rui Feng, Tingkun Liu, Chao Pu, Chuan Zhang, Wei Guo, Jonathan D. Poplawsky, Yanfei Gao, Peter K. Liaw

Materials MicroAnalysis

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

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. 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.

Original language	English
Pages (from-to)	636-647
Number of pages	12
Journal	Materials Science and Engineering: A
Volume	742
DOIs	https://doi.org/10.1016/j.msea.2018.11.055
State	Published - Jan 10 2019

Funding

H. Diao and P.K. Liaw would like to acknowledge the Department of Energy (DOE), Office of Fossil Energy, National Energy Technology Laboratory ( DE-FE-0008855 , DE-FE-0024054 and DE-FE-0011194 ) with Mr. V. Cedro, Mr. R. Dunst, and Dr. J. Mullen as program managers. R. Feng and P.K. Liaw appreciate the support of the U.S. Army Research Office Project ( W911NF-13-1-0438 ) with the program manager, Dr. M.P. Bakas, Dr. N.S. Mathaudhu, and Dr. D.M. Stepp. R. Feng and P.K. Liaw also thank the support from the National Science Foundation ( DMR 1611180 and 1809640 ) with the program directors, Dr. G. Shiflet and Dr. D. Farkas. P.K. Liaw and Y. Gao appreciate the support of the Center for Materials Processing (CMP) with Dr. C.J. Rawn as the director. APT was conducted at the ORNL's Center for Nanophase Materials Sciences (CNMS), which is a U.S. DOE Office of Science User Facility. The neutron diffraction experiment was carried out on the VULCAN diffractometer at the ORNL's Spallation Neutron Source sponsored by the Scientific User Facilities Division , the Office of Basic Energy Sciences , U.S. Department of Energy. T. Liu and Y. Gao were supported by the U.S. Department of Energy , Office of Science , Basic Energy Sciences , Materials Sciences and Engineering Division .

Funders	Funder number
Office of Basic Energy Sciences
Scientific User Facilities Division
U.S. Army Research Office	W911NF-13-1-0438
National Science Foundation	DMR 1611180
U.S. Department of Energy
Directorate for Mathematical and Physical Sciences	1809640
Office of Fossil Energy
Office of Science
Basic Energy Sciences
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering
National Energy Technology Laboratory	DE-FE-0024054, DE-FE-0011194, DE-FE-0008855

Keywords

Atom probe tomography
High entropy alloys
In situ neutron diffraction
Tensile strength
Thermodynamic calculations

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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) 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. 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.",

keywords = "Atom probe tomography, High entropy alloys, In situ neutron diffraction, Tensile strength, Thermodynamic calculations",

author = "Haoyan Diao and Dong Ma and Rui Feng and Tingkun Liu and Chao Pu and Chuan Zhang and Wei Guo and Poplawsky, {Jonathan D.} and Yanfei Gao and Liaw, {Peter K.}",

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year = "2019",

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doi = "10.1016/j.msea.2018.11.055",

language = "English",

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AU - Diao, Haoyan

AU - Ma, Dong

AU - Feng, Rui

AU - Liu, Tingkun

AU - Pu, Chao

AU - Zhang, Chuan

AU - Guo, Wei

AU - Poplawsky, Jonathan D.

AU - Gao, Yanfei

AU - Liaw, Peter K.

PY - 2019/1/10

Y1 - 2019/1/10

N2 - 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. 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.

AB - 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. 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.

KW - Atom probe tomography

KW - High entropy alloys

KW - In situ neutron diffraction

KW - Tensile strength

KW - Thermodynamic calculations

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

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Keywords

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