Deformation behaviour of ultrafine grained Mg–7Gd–5Y–1.2Nd–0.5Zr alloy under high strain rates

Abstract

The mechanical behaviour of Mg–7Gd–5Y–1.2Nd–0.5Zr (wt. %) alloy with ultrafine grains was measured by split Hopkinson pressure bar method under the strain rates of 1000, 1500, and 2000 s−1 at room temperature. Dynamic tests were carried out along extrusion direction (ED), transverse direction (TD), and normal direction (ND). The results demonstrated that the flow stress increased with the increase of strain rate, showing a positive strain rate strengthening effect. There was no obvious anisotropy in dynamic compression along ED, TD, and ND, which was caused by rare earth elements and multi-pass deformation. This led to the adoption of plastic deformation mode dominated by non-basal slip and participated by tension twinning.

Effect of aging-treatment on dynamic compression behaviour and microstructure of ZK60 alloy

“…Strong and lightweight structural materials are of great interest in automotive, aerospace, and other industries for manufacturing lightweight components that can improve operational and energy efficiency to protect the environment. Magnesium (Mg) alloys render the advantages of low density, high strength, good shock absorption, and large elastic moduli, showing great promise in the aforementioned applications [1,2]. However, pure Mg has a hexagonal close-packed (hcp) structure, which tends to exhibit a {0001} basal texture after deformation and poor plastic deformation ability at room temperature.…”

Dynamic compression behaviour and microstructure of ZK60 alloy under different strain rates

“…With the continuous improvement of carrying capacity and increasing airborne range requirements, strong lightweight structural materials have important application value in the automotive, aerospace, and other industries [1,2]. Magnesium (Mg) alloys have been widely used in the aerospace field due to advantages such as low density, high specific strength, and good shock absorption and damping performance [3,4]. Nevertheless, pure Mg has a hexagonal close-packed (hcp) structure that is further restricted during cold and hot deformation, which tends to exhibit a {0001} basal texture following deformation and a poor plastic deformation ability at room temperature.…”