Effect of high strain rate on adiabatic shear susceptibility and microstructures in Al0.4CoCrFeNi high-entropy alloy

Lihong Jiang; Xiaogang Liu; Zhenghua Guo; Zheng Liu; Guangang Wang; Mingjie Zhao; Shanlin Wang; Junhua Cui

Journal of Materials Research and Technology (Jul 2024)

Effect of high strain rate on adiabatic shear susceptibility and microstructures in Al0.4CoCrFeNi high-entropy alloy

Lihong Jiang,
Xiaogang Liu,
Zhenghua Guo,
Zheng Liu,
Guangang Wang,
Mingjie Zhao,
Shanlin Wang,
Junhua Cui

Affiliations

Lihong Jiang: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China; Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components, Nanchang Hangkong University, Nanchang, 330036, China
Xiaogang Liu: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China; School of Aeronautics, Nanjing University of Aeronautics and Astronautics, Nanjing, 211000, China
Zhenghua Guo: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China; Corresponding author.
Zheng Liu: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China
Guangang Wang: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China
Mingjie Zhao: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China; Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components, Nanchang Hangkong University, Nanchang, 330036, China
Shanlin Wang: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China; Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components, Nanchang Hangkong University, Nanchang, 330036, China; Corresponding author. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China.
Junhua Cui: School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063, China

Journal volume & issue: Vol. 31
pp. 2003 – 2013

Abstract

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The effect of high strain rate on adiabatic shear susceptibility and microstructures in Al0.4CoCrFeNi high-entropy alloy (HEA) was examined using a split Hopkinson pressure bar (SHPB) and hat-shaped specimens. The results exhibit a clear strain-hardening effect at high strain rates within the experimental range in six specimen groups. The adiabatic shear band (ASB) with an approximately 1 μm wide was formed at 1.05 × 105 s−1 due to thermoplastic instability resulting from adiabatic temperature rise. The central region of the ASB consists of ultrafine and equiaxed recrystallized grains with a typical size of 100 nm. Comparison of metallographic observation and calculation shear voltage-time, the dynamic shear stress-time curves and the dissipation energy, it was found that the adiabatic shear susceptibility of Al0.4CoCrFeNi HEA increases with increased strain rate. The thermodynamic and kinetic calculations indicate that dynamic recrystallization can occur in the shear band based on the rotational dynamic recrystallization (RDR) mechanism.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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