Dynamic Globularization Behavior of the Dual-Phase TiZrV Medium Entropy Alloy During Hot Working

Globularization is an advantageous way to improve the formability of dual-phase materials. Dynamic globularization behavior of the TiZrV medium entropy alloy (MEA) with dual-phase was investigated at the temperature range of 500 degrees C - 700 degrees C and strain rate of 0.1 s-1 - 10 s-1 by the double-cone compression test. The finite element software was used to simulate the hot compression process of the double-cone specimen. Transmission electron microscope (TEM) was used to study the deformation microstructure features. The double-cone test can produce a wide strain range and corresponding deformation microstructure. The highest globularization ratio of 72.4% was obtained under the strain of about 0.88 at 500 degrees C and 10 s-1. The hot deformation mechanism map in the temperature range of 500 degrees C - 700 degrees C and the strain range of 0.2 - 1.2 at 10 s-1 was constructed by combining the double-cone test with finite element simulation. The hot deformation mechanism map is divided primarily into two parts. At 500 degrees C, in the strain region of 0.2 - 0.88, the deformation mechanism is dynamic recovery (DRV), and in the strain region of 0.88 - 1.2, the deformation mechanism is dynamic recrystallization (DRX). It is considered that DRX plays a key role in dynamic globularization of the TiV phase during hot working and its production is summarized.