Abstract
Ti-5553 alloy is a near-beta titanium alloy with high strength and high fracture toughness. In this paper, the dynamic behaviour and shock-induced martensite phase transformation of Ti-5553 alloy with alpha/beta phases were investigated. Split Hopkinson Pressure Bar was employed to investigate the dynamic properties. Microstructure evolutions were characterized by Scanning Electronic Microscopy and Transmission Electron Microscope. The experimental results have demonstrated that Ti-5553 alloy with alpha/beta phases exhibits various strain rate hardening effects, both failure through adiabatic shear band. Ti-5553 alloy with Widmannstatten microstructure exhibit more obvious strain rate hardening effect, lower critical strain rate for ASB nucleation, compared with the alloy with Bimodal microstructures. Under dynamic compression, shock-induced beta to alpha” martensite transformation occurs.
Highlights
Ti-5553 (Ti-5Al-5Mo-5V-3Cr) alloy is a near-beta titanium alloy with wide applications in aerospace industry due to its high strength and high fracture toughness [1, 2]
The alloy is metastable and near-beta type as its molybdenum equivalent is about 10.5%, which indicates beta matrix phase is unstable and easy to transform to various alpha phases under different heat treatments or loading conditions
The researches on the titanium alloy have shown that alpha/beta microstructures and their contents induce various mechanical properties, similar with other titanium alloys
Summary
Ti-5553 (Ti-5Al-5Mo-5V-3Cr) alloy is a near-beta titanium alloy with wide applications in aerospace industry due to its high strength and high fracture toughness [1, 2]. The alloy is metastable and near-beta type as its molybdenum equivalent is about 10.5%, which indicates beta matrix phase is unstable and easy to transform to various alpha phases under different heat treatments or loading conditions. The effects of heat treatment procedures on the static mechanical properties and fatigue properties of Ti-5553 alloy have been widely investigated [3–5]. The researches on the titanium alloy have shown that alpha/beta microstructures and their contents induce various mechanical properties, similar with other titanium alloys. Such phase transformations as β → α, β → α or β → α usually occur under the mentioned loading conditions [6–8]
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