Abstract
The dynamic mechanical properties and microstructure of the (Al0.5CoCrFeNi)0.95Mo0.025C0.025 high entropy alloy (HEA) prepared by powder extrusion were investigated by a split Hopkinson pressure bar and electron probe microanalyzer and scanning electron microscope. The (Al0.5CoCrFeNi)0.95Mo0.025C0.025 HEA has a uniform face-centered cubic plus body-centered cubic solid solution structure and a fine grain-sized microstructure with a size of about 2 microns. The HEA possesses an excellent strain hardening rate and high strain rate sensitivity at a high strain rate. The Johnson–Cook plastic model was used to describe the dynamic flow behavior. Hat-shaped specimens with different nominal strain levels were used to investigate forced shear localization. After dynamic deformation, a thin and short shear band was generated in the designed shear zone and then the specimen quickly fractured along the shear band.
Highlights
High entropy alloys (HEAs) contain at least five elements in equiatomic or near-equiatomic ratios and have excellent properties [1,2,3,4]
We investigated the microstructure and mechanical behavior of the (Al0.5 CoCrFeNi)0.95 Mo0.025 C0.025 HEA prepared by powder extrusion and explored the forced shear localization of the (Al0.5 CoCrFeNi)0.95 Mo0.025 C0.025 HEA
Diffractometer (Rigaku, Japan) using Cu radiation to analyze the structure of the as-received obtain theMo mechanical properties of the (Al0.5CoCrFeNi)0.95Mo0.025C0.025 HEA, cylinder
Summary
High entropy alloys (HEAs) contain at least five elements in equiatomic or near-equiatomic ratios and have excellent properties [1,2,3,4] They tended to form a simple solid-solution phase when first proposed by Yeh et al [5]. Li et al [23] studied the shear localization in the CrMnFeCoNi HEA and revealed that the deformation mechanism was rotational dynamic recrystallization. They found that the Al0.3 CoCrFeNi HEA was unable to form a shear band [24], and they attributed the remarkable resistance to shear failure to the excellent strain hardening ability. We investigated the microstructure and mechanical behavior of the (Al0.5 CoCrFeNi)0.95 Mo0.025 C0.025 HEA prepared by powder extrusion and explored the forced shear localization of the (Al0.5 CoCrFeNi)0.95 Mo0.025 C0.025 HEA
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