Dynamic globularization behavior of the dual-phase TiZrV medium entropy alloy during hot working

Abstract

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 ℃ ∼ 700 ℃ 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 ℃ and 10 s-1. The hot deformation mechanism map in the temperature range of 500 ℃ ∼ 700 ℃ 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 ℃, 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.