Phase stability and transformation in a light-weight high-entropy alloy

Rui Feng; Michael C. Gao; Chuan Zhang; Wei Guo; Jonathan D. Poplawsky; Fan Zhang; Jeffrey A. Hawk; Joerg C. Neuefeind; Yang Ren; Peter K. Liaw

doi:10.1016/j.actamat.2017.12.061

Phase stability and transformation in a light-weight high-entropy alloy

Rui Feng, Michael C. Gao, Chuan Zhang, Wei Guo, Jonathan D. Poplawsky, Fan Zhang, Jeffrey A. Hawk, Joerg C. Neuefeind, Yang Ren, Peter K. Liaw

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

150 Scopus citations

Abstract

Light-weight high-entropy alloys (HEAs) with a vast alloy-design space have offered new avenues to explore novel low-cost, high strength-to-weight ratio structural materials. Studying their phase stability and possible transformations is critical for designing microstructures for optimal material properties. However, the complex local atomic environment of HEAs poses challenges to the fundamental understanding of phase stability and transformation behaviors. The present study investigates the phase stability and transformation behaviors of a newly-designed light-weight Al₁_.₅CrFeMnTi HEA by integrated experimental and theoretical approaches. The coherent precipitation of the L2₁ phase within the body-centered-cubic (BCC) matrix at intermediate temperatures was observed, and the size, shape, coherency, and spatial distribution of the L2₁ phase were subsequently altered through selected annealing treatments. Moreover, the CALculation of PHAse Diagrams (CALPHAD) and first-principle calculations successfully optimize the compositions of light-weight HEAs with a coherent BCC/L2₁ two-phase structure. Shed light by the present study, novel light-weight HEAs, featuring the lower density (below 6 g/cm³) and cost, can be designed for high-temperature applications.

Original language	English
Pages (from-to)	280-293
Number of pages	14
Journal	Acta Materialia
Volume	146
DOIs	https://doi.org/10.1016/j.actamat.2017.12.061
State	Published - Mar 2018

Funding

The authors very much appreciate the support from the U.S. Army Office Project ( W911NF-13-1-0438 ) with the program managers, M.P. Bakas and D.M. Stepp. P.K.L 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 V.N. Cedro, R.J. Dunst, and J. Mullen as program managers. R.F and P.K.L also thank the support from the National Science Foundation ( DMR-1611180 ) with the program director, D. Farkas. P.K.L is pleased to acknowledge the financial support by the Ministry of Science and Technology of Taiwan , under Grant no. MOST 105-2221-E-007-017-MY3 , and the Department of Materials Science and Engineering, National Tsing Hua University, Taiwan . P.K.L very much appreciate (1) the support of the Center for Materials Processing (CMP) at The University of Tennessee with Prof. C.J. Rawn as the director and (2) Characterization Laboratory at Joint Institute for Advanced Materials (JIAM). The first-principles simulations were carried out to support the Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL)-Strategic Center for Coal , managed by Robert Romanosky (Technology Manager) and Charles Miller (Technology Monitor). The research was executed through the NETL's Office of Research and Development's Innovative Process Technologies (IPT) Field Work Proposal. Research performed by the AECOM Staff was conducted under the RES contract, DE-FE-0004000 . 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 present research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by ORNL . The present research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by the Argonne National Laboratory under Contract No. DE-AC02-06CH11357 . Appendix A The authors very much appreciate the support from the U.S. Army Office Project (W911NF-13-1-0438) with the program managers, M.P. Bakas and D.M. Stepp. P.K.L 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 V.N. Cedro, R.J. Dunst, and J. Mullen as program managers. R.F and P.K.L also thank the support from the National Science Foundation (DMR-1611180) with the program director, D. Farkas. P.K.L is pleased to acknowledge the financial support by the Ministry of Science and Technology of Taiwan, under Grant no. MOST 105-2221-E-007-017-MY3, and the Department of Materials Science and Engineering, National Tsing Hua University, Taiwan. P.K.L very much appreciate (1) the support of the Center for Materials Processing (CMP) at The University of Tennessee with Prof. C.J. Rawn as the director and (2) Characterization Laboratory at Joint Institute for Advanced Materials (JIAM). The first-principles simulations were carried out to support the Cross-Cutting Technologies Program at the National Energy Technology Laboratory (NETL)-Strategic Center for Coal, managed by Robert Romanosky (Technology Manager) and Charles Miller (Technology Monitor). The research was executed through the NETL's Office of Research and Development's Innovative Process Technologies (IPT) Field Work Proposal. Research performed by the AECOM Staff was conducted under the RES contract, DE-FE-0004000. 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 present research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by ORNL. The present research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by the Argonne National Laboratory under Contract No. DE-AC02-06CH11357.

Funders	Funder number
Advanced Photon Source
DOE Office of Science User Facility operated
Office of Research and Development's Innovative Process Technologies
U.S. Army Office Project	W911NF-13-1-0438
DOE Office of Science
National Science Foundation	DMR-1611180
U.S. Department of Energy	DE-FE-0024054, DE-FE-0011194, DE-FE-0008855
Argonne National Laboratory
Albert Einstein College of Medicine, Yeshiva University	DE-FE-0004000
Ministry of Science and Technology, Taiwan	105-2221-E-007-017-MY3
National Tsing Hua University

Keywords

High-entropy alloys
Phase stability
Phase transformation
Precipitation

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10.1016/j.actamat.2017.12.061

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title = "Phase stability and transformation in a light-weight high-entropy alloy",

abstract = "Light-weight high-entropy alloys (HEAs) with a vast alloy-design space have offered new avenues to explore novel low-cost, high strength-to-weight ratio structural materials. Studying their phase stability and possible transformations is critical for designing microstructures for optimal material properties. However, the complex local atomic environment of HEAs poses challenges to the fundamental understanding of phase stability and transformation behaviors. The present study investigates the phase stability and transformation behaviors of a newly-designed light-weight Al1.5CrFeMnTi HEA by integrated experimental and theoretical approaches. The coherent precipitation of the L21 phase within the body-centered-cubic (BCC) matrix at intermediate temperatures was observed, and the size, shape, coherency, and spatial distribution of the L21 phase were subsequently altered through selected annealing treatments. Moreover, the CALculation of PHAse Diagrams (CALPHAD) and first-principle calculations successfully optimize the compositions of light-weight HEAs with a coherent BCC/L21 two-phase structure. Shed light by the present study, novel light-weight HEAs, featuring the lower density (below 6 g/cm3) and cost, can be designed for high-temperature applications.",

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AU - Feng, Rui

AU - Gao, Michael C.

AU - Zhang, Chuan

AU - Guo, Wei

AU - Poplawsky, Jonathan D.

AU - Zhang, Fan

AU - Hawk, Jeffrey A.

AU - Neuefeind, Joerg C.

AU - Ren, Yang

AU - Liaw, Peter K.

PY - 2018/3

Y1 - 2018/3

N2 - Light-weight high-entropy alloys (HEAs) with a vast alloy-design space have offered new avenues to explore novel low-cost, high strength-to-weight ratio structural materials. Studying their phase stability and possible transformations is critical for designing microstructures for optimal material properties. However, the complex local atomic environment of HEAs poses challenges to the fundamental understanding of phase stability and transformation behaviors. The present study investigates the phase stability and transformation behaviors of a newly-designed light-weight Al1.5CrFeMnTi HEA by integrated experimental and theoretical approaches. The coherent precipitation of the L21 phase within the body-centered-cubic (BCC) matrix at intermediate temperatures was observed, and the size, shape, coherency, and spatial distribution of the L21 phase were subsequently altered through selected annealing treatments. Moreover, the CALculation of PHAse Diagrams (CALPHAD) and first-principle calculations successfully optimize the compositions of light-weight HEAs with a coherent BCC/L21 two-phase structure. Shed light by the present study, novel light-weight HEAs, featuring the lower density (below 6 g/cm3) and cost, can be designed for high-temperature applications.

AB - Light-weight high-entropy alloys (HEAs) with a vast alloy-design space have offered new avenues to explore novel low-cost, high strength-to-weight ratio structural materials. Studying their phase stability and possible transformations is critical for designing microstructures for optimal material properties. However, the complex local atomic environment of HEAs poses challenges to the fundamental understanding of phase stability and transformation behaviors. The present study investigates the phase stability and transformation behaviors of a newly-designed light-weight Al1.5CrFeMnTi HEA by integrated experimental and theoretical approaches. The coherent precipitation of the L21 phase within the body-centered-cubic (BCC) matrix at intermediate temperatures was observed, and the size, shape, coherency, and spatial distribution of the L21 phase were subsequently altered through selected annealing treatments. Moreover, the CALculation of PHAse Diagrams (CALPHAD) and first-principle calculations successfully optimize the compositions of light-weight HEAs with a coherent BCC/L21 two-phase structure. Shed light by the present study, novel light-weight HEAs, featuring the lower density (below 6 g/cm3) and cost, can be designed for high-temperature applications.

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Phase stability and transformation in a light-weight high-entropy alloy

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