Microstructure and mechanical properties of hot-rolled ZrTiAlV alloys

Zr-based alloys are commonly used as nuclear materials. A series of ZrTiAlV alloys were investigated to develop Zr-based alloys with excellent mechanical properties and broaden the application of Zr metals. Apart from a mechanical testing, X-ray diffraction and metallographic analyses were used to study the structural and mechanical properties of hot-rolled ZrTiAlV alloys. The results showed that the microstructure of alloys went through a series of changes from the α (α′)-phase to part or all of the β-phase, thus affecting the mechanical properties as Zr increased. As the volume fraction of the β-phase increased, ductility was enhanced gradually, and tensile strength remained at a high level. A steep decline in strength was observed as soon as the entirety of the β-phase retained. The Zr–40.8Ti–4.4Al–2.9V alloy was found to be the best composition in terms of tensile strength (σb = 1246 MPa) and ductility (δ = 11%), with insignificant anisotropy after hot rolling. A number of new, Zr-based alloys with excellent mechanical properties are also reported in the current study.

► The β transus temperature alloys are significantly related to the amount of Zr and Ti. ► The phase compositions change significantly with Zr content. ► Excellent mechanical properties are exhibited. ► The anisotropy of hot-rolled Zr–40.8Ti–4.4Al–2.9V alloy is insignificant.