Hot deformation behavior of 51.1Zr–40.2Ti–4.5Al–4.2V alloy in the single β phase field

Abstract

The hot deformation behavior of a newly developed 51.1Zr-40.2Ti-4.5Al-4.2 V alloy was investigated by compression tests in the deformation temperature range from 800 to 1050 1C and strain rate range from 10 À 3 to 10 0 s À 1 . At low temperatures and high strain rates, the flow curves exhibited a pronounced stress drop at the very beginning of deformation, followed by a slow decrease in flow stress with increasing strain. The magnitude of the stress drop increased with decreasing deformation temperature and increasing strain rate. At high temperatures and low strain rates, the flow curves exhibited typical characteristics of dynamic recrystallization. A hyperbolic-sine Arrhenius-type equation was used to characterize the dependences of the flow stress on deformation temperature and strain rate. The activation energy for hot deformation decreased slightly with increasing strain and then tended to be a constant value. A microstructural mechanism map was presented to help visualize the microstructure of this alloy under different deformation conditions.

On the Compression Properties and Erosion-Corrosion Behaviour of Al 6061/15%Sicp Composite

“…This leads to higher strain hardening. At higher temperatures (450 o C and 500 o C), the material became more ductile and has a softening behavior [33]. It can be concluded that the flow stress is directly dependent on the strain rate.…”