Tensile ductility of an AlCoCrFeNi multi-phase high-entropy alloy through hot isostatic pressing (HIP) and homogenization

Zhi Tang; Oleg N. Senkov; Chad M. Parish; Chuan Zhang; Fan Zhang; Louis J. Santodonato; Gongyao Wang; Guangfeng Zhao; Fuqian Yang; Peter K. Liaw

doi:10.1016/j.msea.2015.08.078

Tensile ductility of an AlCoCrFeNi multi-phase high-entropy alloy through hot isostatic pressing (HIP) and homogenization

Zhi Tang
, Oleg N. Senkov
, Chad M. Parish
, Chuan Zhang
, Fan Zhang
, Louis J. Santodonato
, Gongyao Wang
, Guangfeng Zhao
, Fuqian Yang
, Peter K. Liaw

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

278 Scopus citations

Abstract

The microstructure and phase composition of an AlCoCrFeNi high-entropy alloy (HEA) were studied in as-cast (AlCoCrFeNi-AC, AC represents as-cast) and homogenized (AlCoCrFeNi-HP, HP signifies hot isostatic pressed and homogenized) conditions. The AlCoCrFeNi-AC ally has a dendritric structure in the consisting primarily of a nano-lamellar mixture of A2 (disordered body-centered-cubic (BCC)) and B2 (ordered BCC) phases, formed by an eutectic reaction. The homogenization heat treatment, consisting of hot isostatic pressed for 1 h at 1100 °C, 207. MPa and annealing at 1150 °C for 50 h, resulted in an increase in the volume fraction of the A1 phase and formation of a Sigma (σ) phase. Tensile properties in as-cast and homogenized conditions are reported at 700 °C. The ultimate tensile strength was virtually unaffected by heat treatment, and was 396±4. MPa at 700 °C. However, homogenization produced a noticeable increase in ductility. The AlCoCrFeNi-AC alloy showed a tensile elongation of only 1.0%, while after the heat-treatment, the elongation of AlCoCrFeNi-HP was 11.7%. Thermodynamic modeling of non-equilibrium and equilibrium phase diagrams for the AlCoCrFeNi HEA gave good agreement with the experimental observations of the phase contents in the AlCoCrFeNi-AC and AlCoCrFeNi-HP. The reasons for the improvement of ductility after the heat treatment and the crack initiation subjected to tensile loading were discussed.

Original language	English
Pages (from-to)	229-240
Number of pages	12
Journal	Materials Science and Engineering: A
Volume	647
DOIs	https://doi.org/10.1016/j.msea.2015.08.078
State	Published - Oct 28 2015

Bibliographical note

Publisher Copyright:
© 2015 Published byElsevier B.V.

Funding

The authors very much appreciate the original proposed idea of this work from D.B. Miracle of the Air Force Research Laboratory (AFRL) and his many great comments and discussions on this paper. ZT, LJS, GW, and PKL would like to acknowledge the financial support from the Department of Energy (DOE) Office of Nuclear Energy’s Nuclear Energy University Program (NEUP) 00119262 , and the DOE, Office of Fossil Energy, National Energy Technology Laboratory ( DE-FE-0008855, DE-FE-0011194, and DE-FE-0024054 ), with R.O. Jensen, Jr., L. Tian, V. Cedro, S. Lesica, S. Markovich, J. Mullen, and R. Dunst as program managers. PKL thanks the U.S. Army Research Office project (W911NF-13-1-3080438) with the program manager, S.N. Mathaudhu and D.M. Stepp. The authors also gratefully acknowledge D. Robinson of the Advanced Photon Source (APS) in the Argonne National Laboratory for assistance with the high-energy X-ray diffraction measurements, D. Fielden, M. Bharadwaj and G. Jones of The University of Tennessee (UT) for the technical support. ZT very much appreciates C.P. Chuang, J.E. Spruiell, and C.D. Lundin of UT, J.S. Hou of the Chinese Academy of Sciences, J.W. Qiao of Taiyuan University of Technology China, M.C. Gao of the National Energy Technology Laboratory (NETL) for helpful discussions. Work at AFRL was supported through the United States Air Force (USAF) Contract no. FA8650-10-D-5226 . Research sponsored by the Oak Ridge National Laboratory (ORNL)’s Shared Research Equipment (ShaRE) User Program, which was sponsored by the Office of Basic Energy Sciences, U.S. Department of Energy (C.M. Parish). The authors very much appreciate M.K. Miller of ORNL for his efforts on the atom-probe tomography (APT).

Funders	Funder number
U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center
Army Research Office	W911NF-13-1-3080438
Army Research Office
Office of Fossil Energy and Carbon Management
Office of High Energy and Nuclear Physics	00119262
Office of High Energy and Nuclear Physics
DOE Basic Energy Sciences
Oak Ridge National Laboratory
U.S. Air Force	FA8650-10-D-5226
U.S. Air Force
National Energy Technology Laboratory	DE-FE-0024054, DE-FE-0011194, DE-FE-0008855
National Energy Technology Laboratory

Keywords

Crack initiation
Heat treatment
High-entropy alloys
Microstructures
Tensile properties
Thermodynamic modeling

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2015.08.078

Cite this

@article{bd6768ccc73d4b1db2e69a664b2f0f40,

title = "Tensile ductility of an AlCoCrFeNi multi-phase high-entropy alloy through hot isostatic pressing (HIP) and homogenization",

abstract = "The microstructure and phase composition of an AlCoCrFeNi high-entropy alloy (HEA) were studied in as-cast (AlCoCrFeNi-AC, AC represents as-cast) and homogenized (AlCoCrFeNi-HP, HP signifies hot isostatic pressed and homogenized) conditions. The AlCoCrFeNi-AC ally has a dendritric structure in the consisting primarily of a nano-lamellar mixture of A2 (disordered body-centered-cubic (BCC)) and B2 (ordered BCC) phases, formed by an eutectic reaction. The homogenization heat treatment, consisting of hot isostatic pressed for 1 h at 1100 °C, 207. MPa and annealing at 1150 °C for 50 h, resulted in an increase in the volume fraction of the A1 phase and formation of a Sigma (σ) phase. Tensile properties in as-cast and homogenized conditions are reported at 700 °C. The ultimate tensile strength was virtually unaffected by heat treatment, and was 396±4. MPa at 700 °C. However, homogenization produced a noticeable increase in ductility. The AlCoCrFeNi-AC alloy showed a tensile elongation of only 1.0\%, while after the heat-treatment, the elongation of AlCoCrFeNi-HP was 11.7\%. Thermodynamic modeling of non-equilibrium and equilibrium phase diagrams for the AlCoCrFeNi HEA gave good agreement with the experimental observations of the phase contents in the AlCoCrFeNi-AC and AlCoCrFeNi-HP. The reasons for the improvement of ductility after the heat treatment and the crack initiation subjected to tensile loading were discussed.",

keywords = "Crack initiation, Heat treatment, High-entropy alloys, Microstructures, Tensile properties, Thermodynamic modeling",

author = "Zhi Tang and Senkov, \{Oleg N.\} and Parish, \{Chad M.\} and Chuan Zhang and Fan Zhang and Santodonato, \{Louis J.\} and Gongyao Wang and Guangfeng Zhao and Fuqian Yang and Liaw, \{Peter K.\}",

note = "Publisher Copyright: {\textcopyright} 2015 Published byElsevier B.V.",

year = "2015",

month = oct,

day = "28",

doi = "10.1016/j.msea.2015.08.078",

language = "English",

volume = "647",

pages = "229--240",

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T1 - Tensile ductility of an AlCoCrFeNi multi-phase high-entropy alloy through hot isostatic pressing (HIP) and homogenization

AU - Tang, Zhi

AU - Senkov, Oleg N.

AU - Parish, Chad M.

AU - Zhang, Chuan

AU - Zhang, Fan

AU - Santodonato, Louis J.

AU - Wang, Gongyao

AU - Zhao, Guangfeng

AU - Yang, Fuqian

AU - Liaw, Peter K.

PY - 2015/10/28

Y1 - 2015/10/28

N2 - The microstructure and phase composition of an AlCoCrFeNi high-entropy alloy (HEA) were studied in as-cast (AlCoCrFeNi-AC, AC represents as-cast) and homogenized (AlCoCrFeNi-HP, HP signifies hot isostatic pressed and homogenized) conditions. The AlCoCrFeNi-AC ally has a dendritric structure in the consisting primarily of a nano-lamellar mixture of A2 (disordered body-centered-cubic (BCC)) and B2 (ordered BCC) phases, formed by an eutectic reaction. The homogenization heat treatment, consisting of hot isostatic pressed for 1 h at 1100 °C, 207. MPa and annealing at 1150 °C for 50 h, resulted in an increase in the volume fraction of the A1 phase and formation of a Sigma (σ) phase. Tensile properties in as-cast and homogenized conditions are reported at 700 °C. The ultimate tensile strength was virtually unaffected by heat treatment, and was 396±4. MPa at 700 °C. However, homogenization produced a noticeable increase in ductility. The AlCoCrFeNi-AC alloy showed a tensile elongation of only 1.0%, while after the heat-treatment, the elongation of AlCoCrFeNi-HP was 11.7%. Thermodynamic modeling of non-equilibrium and equilibrium phase diagrams for the AlCoCrFeNi HEA gave good agreement with the experimental observations of the phase contents in the AlCoCrFeNi-AC and AlCoCrFeNi-HP. The reasons for the improvement of ductility after the heat treatment and the crack initiation subjected to tensile loading were discussed.

AB - The microstructure and phase composition of an AlCoCrFeNi high-entropy alloy (HEA) were studied in as-cast (AlCoCrFeNi-AC, AC represents as-cast) and homogenized (AlCoCrFeNi-HP, HP signifies hot isostatic pressed and homogenized) conditions. The AlCoCrFeNi-AC ally has a dendritric structure in the consisting primarily of a nano-lamellar mixture of A2 (disordered body-centered-cubic (BCC)) and B2 (ordered BCC) phases, formed by an eutectic reaction. The homogenization heat treatment, consisting of hot isostatic pressed for 1 h at 1100 °C, 207. MPa and annealing at 1150 °C for 50 h, resulted in an increase in the volume fraction of the A1 phase and formation of a Sigma (σ) phase. Tensile properties in as-cast and homogenized conditions are reported at 700 °C. The ultimate tensile strength was virtually unaffected by heat treatment, and was 396±4. MPa at 700 °C. However, homogenization produced a noticeable increase in ductility. The AlCoCrFeNi-AC alloy showed a tensile elongation of only 1.0%, while after the heat-treatment, the elongation of AlCoCrFeNi-HP was 11.7%. Thermodynamic modeling of non-equilibrium and equilibrium phase diagrams for the AlCoCrFeNi HEA gave good agreement with the experimental observations of the phase contents in the AlCoCrFeNi-AC and AlCoCrFeNi-HP. The reasons for the improvement of ductility after the heat treatment and the crack initiation subjected to tensile loading were discussed.

KW - Crack initiation

KW - Heat treatment

KW - High-entropy alloys

KW - Microstructures

KW - Tensile properties

KW - Thermodynamic modeling

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U2 - 10.1016/j.msea.2015.08.078

DO - 10.1016/j.msea.2015.08.078

M3 - Article

AN - SCOPUS:84941627828

SN - 0921-5093

VL - 647

SP - 229

EP - 240

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Tensile ductility of an AlCoCrFeNi multi-phase high-entropy alloy through hot isostatic pressing (HIP) and homogenization

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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