Microstructures and deformation mechanisms of the medium-entropy alloy (NiCoCr)76(Ni6AlTi)3
Abstract
Here the microstructures and deformation mechanisms of the f.c.c. medium-entropy alloy (MEA) (NiCoCr)76(Ni6AlTi)3 has been analyzed after various thermo-mechanical treatments. The solutionized, single-phase MEA, which had a grain size of 93.4 ± 31.9 μm, was cold-rolled (CR) to a 80% thickness reduction after which it showed both a high yield strength (YS) of 1539 MPa and a high ultimate tensile strength (UTS) of 1602 MPa, but an elongation to failure, ε, of only 16%. The CR MEA was then subjected to one of two heat treatments: (1) the CR MEA was recrystallized at 1100°C for 24 h, which produced a single-phase material with 85 ± 61.7 μm grain size that exhibited a much lower YS and UTS of 364 MPa and 747 MPa, respectively, but a much greater ε of 73%; and (2) the MEA was aged at 700°C for 24 h, which produced a fine-grained (1.1 ± 0.9 μm) material and a high volume fraction (0.35) of 12 nm dia. L12 nanoparticles that exhibited an excellent combination of strength and ductility, viz., YS~1501 MPa, UTS~1651 MPa, elongation ~26%. The grain boundary strengthening and precipitation strengthening were together estimated to account for ~58% of the YS in the latter material.more »
- Authors:
-
- Guangdong Academy of Sciences, Guangzhou (China). China-Ukraine Institute of Welding
- South China Univ. of Technology (SCUT), Guangzhou (China)
- Foshan Polytechnic (China)
- Dartmouth College, Hanover, NH (United States)
- Publication Date:
- Research Org.:
- Dartmouth College, Hanover, NH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Guangdong Academy of Sciences (GDAS); Guangzhou Municipal Science and Technology Bureau; Department of Education of Guangdong Province; China Ministry of Science and Technology
- OSTI Identifier:
- 1977470
- Alternate Identifier(s):
- OSTI ID: 1961049
- Grant/Contract Number:
- SC0018962; 2022GDASZH-2022010107; 2018B090904004; 2017B030314048; 201907010010; 2019GKCXTD005; 2020YFE0205300
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
- Additional Journal Information:
- Journal Volume: 849; Journal Issue: C; Journal ID: ISSN 0921-5093
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering; Medium-entropy alloys; Microstructure; Mechanical properties; Strengthening mechanisms; Deformation mechanisms
Citation Formats
Peng, Hanlin, Hu, Ling, Chen, Junfu, Huang, Siming, Li, Liejun, Yi, Yaoyong, Zhou, Feng, Fang, Weiping, and Baker, Ian. Microstructures and deformation mechanisms of the medium-entropy alloy (NiCoCr)76(Ni6AlTi)3. United States: N. p., 2022.
Web. doi:10.1016/j.msea.2022.143449.
Peng, Hanlin, Hu, Ling, Chen, Junfu, Huang, Siming, Li, Liejun, Yi, Yaoyong, Zhou, Feng, Fang, Weiping, & Baker, Ian. Microstructures and deformation mechanisms of the medium-entropy alloy (NiCoCr)76(Ni6AlTi)3. United States. https://doi.org/10.1016/j.msea.2022.143449
Peng, Hanlin, Hu, Ling, Chen, Junfu, Huang, Siming, Li, Liejun, Yi, Yaoyong, Zhou, Feng, Fang, Weiping, and Baker, Ian. Thu .
"Microstructures and deformation mechanisms of the medium-entropy alloy (NiCoCr)76(Ni6AlTi)3". United States. https://doi.org/10.1016/j.msea.2022.143449. https://www.osti.gov/servlets/purl/1977470.
@article{osti_1977470,
title = {Microstructures and deformation mechanisms of the medium-entropy alloy (NiCoCr)76(Ni6AlTi)3},
author = {Peng, Hanlin and Hu, Ling and Chen, Junfu and Huang, Siming and Li, Liejun and Yi, Yaoyong and Zhou, Feng and Fang, Weiping and Baker, Ian},
abstractNote = {Here the microstructures and deformation mechanisms of the f.c.c. medium-entropy alloy (MEA) (NiCoCr)76(Ni6AlTi)3 has been analyzed after various thermo-mechanical treatments. The solutionized, single-phase MEA, which had a grain size of 93.4 ± 31.9 μm, was cold-rolled (CR) to a 80% thickness reduction after which it showed both a high yield strength (YS) of 1539 MPa and a high ultimate tensile strength (UTS) of 1602 MPa, but an elongation to failure, ε, of only 16%. The CR MEA was then subjected to one of two heat treatments: (1) the CR MEA was recrystallized at 1100°C for 24 h, which produced a single-phase material with 85 ± 61.7 μm grain size that exhibited a much lower YS and UTS of 364 MPa and 747 MPa, respectively, but a much greater ε of 73%; and (2) the MEA was aged at 700°C for 24 h, which produced a fine-grained (1.1 ± 0.9 μm) material and a high volume fraction (0.35) of 12 nm dia. L12 nanoparticles that exhibited an excellent combination of strength and ductility, viz., YS~1501 MPa, UTS~1651 MPa, elongation ~26%. The grain boundary strengthening and precipitation strengthening were together estimated to account for ~58% of the YS in the latter material. After deformation, the recrystallized MEA contained numerous stacking faults and a Taylor lattice structure containing domain boundaries and microbands, while the aged MEA exhibited numerous stacking faults and sheared particles. The density of low-angle grain boundaries (LAGBs) in the recrystallized MEA increased by 100 times to 2.2 × 10–1 μm/μm2 while the density of CSL Σ3n boundaries decreased by 71% to 7.8 × 10–3 μm/μm2 after deformation. In contrast, the density of LAGBs in the aged MEA increased by 5 times to 2.6 μm/μm2 while the density of CSL Σ3n boundaries decreased by 57% to 0.6 μm/μm2 after deformation.},
doi = {10.1016/j.msea.2022.143449},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 849,
place = {United States},
year = {Thu Jun 16 00:00:00 EDT 2022},
month = {Thu Jun 16 00:00:00 EDT 2022}
}
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