Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3

Peng, Hanlin; Yi, Yaoyong; Fang, Weiping; Hu, Ling; Baker, Ian; Li, Liejun; Luo, Bingbing

doi:10.1016/j.intermet.2021.107439

Title: Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)₉₄Al₃Ti₃

Journal Article · 15 December 2021 · Intermetallics

DOI: https://doi.org/10.1016/j.intermet.2021.107439 · OSTI ID:1977223

Peng, Hanlin ^[1]; Yi, Yaoyong ^[2]; Fang, Weiping ^[2]; Hu, Ling ^[3];

^[4]; Li, Liejun ^[3]; Luo, Bingbing ^[2]

Guangdong Academy of Sciences (China); OSTI
Guangdong Academy of Sciences (China)
South China Univ. of Technology (SCUT), Guangzhou (China)
Dartmouth College, Hanover, NH (United States)

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.

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Research Organization:: Dartmouth College, Hanover, NH (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018962

OSTI ID:: 1977223

Journal Information:: Intermetallics, Journal Name: Intermetallics Journal Issue: C Vol. 141; ISSN 0966-9795

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)94Al3Ti3

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Title: Optimization of the microstructure and mechanical properties of electron beam welded high-strength medium-entropy alloy (NiCoCr)₉₄Al₃Ti₃