Abstract
This work presents a comprehensive analysis of the effects of strain and strain rate on the adiabatic heating and the mechanical behavior of a CoCrFeMnNi high-entropy alloy (HEA). In this investigation, compression tests were carried out at quasi-static and dynamic strain rates. The temperature of the specimens was measured using high speed infrared thermography. The high strain rate tests were conducted with a Split Hopkinson Pressure Bar, and the tests at lower strain rates were performed using a universal testing machine. The material exhibited a positive strain rate sensitivity, as true stress–strain plots were shifted upwards with the increase in strain rate. With exception of the isothermal tests, temperature rise and the Taylor–Quinney coefficient (β) were noticeably similar for the investigated strain rates. This study shows that the common assumption that β can be considered 0.9 and constant is possibly not very accurate for the CoCrFeMnNi alloy. The β is influenced by at least strain and strain rate.
Highlights
High-entropy alloys (HEAs) are a new class of multi-component metallic alloys, which comprise four or more elements in equiatomic or near equiatomic composition with high configurational entropy
The CoCrFeMnNi high-entropy alloy was cast into a square cross section ingot (140 × 40 × 40 mm) by drop casting in argon atmosphere
DRX could have been caused by the strong shear localization
Summary
High-entropy alloys (HEAs) are a new class of multi-component metallic alloys, which comprise four or more elements in equiatomic or near equiatomic composition with high configurational entropy. The CoCrFeMnNi highentropy alloy has a face-centered cubic crystal structure, which has a large number of slip systems [2] and a unique combination of mechanical strength, malleability, and fracture toughness [3] These alloys are expected to Temperature and strain rate play important roles on the mechanical behavior of the CoCrFeMnNi high-entropy alloy and of materials in general [2, 3, 5]. Park et al [6] studied the influence of strain rate on the mechanical properties of the CoCrFeMnNi alloy and reported a substantial yield strength dependence on strain rate, as well as different strain hardening behaviors for different strain rates They observed the formation of mechanically induced twins and occurrence of adiabatic shear bands on the samples deformed at dynamic strain rates. Li et al [7] studied the formation of
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