Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3
Abstract
For this work, the weldability and effects of subsequent heat treatment on the microstructure and mechanical properties of the medium-entropy alloy (MEA) (NiCoCr)94Al3Ti3 have been explored using electron beam welding (EBW). It was found that EBW joints consist of a supersaturated f.c.c. matrix with coarse, asymmetric columnar grains (17.7–24 μm). The fraction of twins and Σ3n CSL boundaries in weld joints was only 10% of that in the base metal, a value which increased to 30% after aging at 800 °C. The aging also led to improvements in the hardness, tensile strength, and work hardening rate, a result of the precipitation of a high volume fraction (0.29–0.33) of ultrafine (15–17.4 nm dia.) coherent spherical L12-structured particles. The contributions of the L12 nanoparticles and Hall-Petch strengthening to the yield strength were estimated to be 537–573 MPa and 105–123 MPa, respectively. The MEA shows excellent weldability and, after aging, good strength (YS~1098 MPa, UTS~1368 MPa) and elongation to failure (~11%) by ductile fracture.
- Authors:
-
[3];
- Guangdong Academy of Sciences (China)
- South China Univ. of Technology (SCUT), Guangzhou (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)
- OSTI Identifier:
- 1977223
- Alternate Identifier(s):
- OSTI ID: 1836147
- Grant/Contract Number:
- SC0018962
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Intermetallics
- Additional Journal Information:
- Journal Volume: 141; Journal Issue: C; Journal ID: ISSN 0966-9795
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Medium-entropy alloys; Electron beam welding; Microstructure; Mechanical properties; Strengthening mechanisms
Citation Formats
Peng, Hanlin, Yi, Yaoyong, Fang, Weiping, Hu, Ling, Baker, Ian, Li, Liejun, and Luo, Bingbing. Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3. United States: N. p., 2021.
Web. doi:10.1016/j.intermet.2021.107439.
Peng, Hanlin, Yi, Yaoyong, Fang, Weiping, Hu, Ling, Baker, Ian, Li, Liejun, & Luo, Bingbing. Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3. United States. https://doi.org/10.1016/j.intermet.2021.107439
Peng, Hanlin, Yi, Yaoyong, Fang, Weiping, Hu, Ling, Baker, Ian, Li, Liejun, and Luo, Bingbing. Wed .
"Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3". United States. https://doi.org/10.1016/j.intermet.2021.107439. https://www.osti.gov/servlets/purl/1977223.
@article{osti_1977223,
title = {Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3},
author = {Peng, Hanlin and Yi, Yaoyong and Fang, Weiping and Hu, Ling and Baker, Ian and Li, Liejun and Luo, Bingbing},
abstractNote = {For this work, the weldability and effects of subsequent heat treatment on the microstructure and mechanical properties of the medium-entropy alloy (MEA) (NiCoCr)94Al3Ti3 have been explored using electron beam welding (EBW). It was found that EBW joints consist of a supersaturated f.c.c. matrix with coarse, asymmetric columnar grains (17.7–24 μm). The fraction of twins and Σ3n CSL boundaries in weld joints was only 10% of that in the base metal, a value which increased to 30% after aging at 800 °C. The aging also led to improvements in the hardness, tensile strength, and work hardening rate, a result of the precipitation of a high volume fraction (0.29–0.33) of ultrafine (15–17.4 nm dia.) coherent spherical L12-structured particles. The contributions of the L12 nanoparticles and Hall-Petch strengthening to the yield strength were estimated to be 537–573 MPa and 105–123 MPa, respectively. The MEA shows excellent weldability and, after aging, good strength (YS~1098 MPa, UTS~1368 MPa) and elongation to failure (~11%) by ductile fracture.},
doi = {10.1016/j.intermet.2021.107439},
journal = {Intermetallics},
number = C,
volume = 141,
place = {United States},
year = {Wed Dec 15 00:00:00 EST 2021},
month = {Wed Dec 15 00:00:00 EST 2021}
}
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