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Enhancement of Mechanical Properties in Al0.35CoCrFeNi Complex Concentrated Alloys Through Grain Size Tailoring

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Abstract:

This paper presents experimental results on the processing of complex concentrated alloy with a nominal composition of A0.35CoCrFeNi. The alloy was produced by vacuum induction melting and tilt casting. The microstructure of the as-cast CCA consists of dendritic and interdendritic regions homogenized by heat treatment at 1360 °C. After rotary swaging at room temperature, the microstructure is characterized by an abundance of dislocations and continuously intersecting slip bands. Annealing experiments were carried out in the temperature range of 1150 °C – 1300 °C and different holding times to determine the parameters of grain growth kinetics. Phase and chemical analysis were investigated using XRD and EDS methods. The activation energy of recrystallization in the studied composition was 458 kJ mol-1. The influence of grain size on room temperature mechanical properties and tensile properties was determined. The hardening coefficients kh and kσ, calculated using the Hall-Petch relation, were 277.5 HV µm-1/2 and 655 MPa µm-1/2, indicating the effectiveness of grain boundary hardening in the studied single-phase CCA.

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Periodical:

Defect and Diffusion Forum (Volume 448)

Pages:

101-106

DOI:

https://doi.org/10.4028/p-86TaGl

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Online since:

March 2026

Authors:

Kateryna Ulybkina*, Kateryna Kamyshnykova, Tatiana Pelachová, Alena Klimová

Keywords:

Activation Energy, Complex Concentrated Alloy, Grain Growth, Hall-Petch Relationship, Recrystallization

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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