High temperature deformations of Mg–Y–Nd alloys fabricated by different routes

The high temperature tensile properties and microstructural evolutions of Mg–5Y–4Nd (WE54) alloys with extrusion and extrusion followed by equal channel angular extrusion (ECAE) were investigated at elevated temperatures. The results suggested that the as-extruded specimens exhibited enhanced ductility at 400 and 450 °C, and a maximum elongation of 290% was obtained at 450 °C and 1 × 10−3 s−1, corresponding to the m-value of 0.38. On the other hand, ECAE following extrusion led to high strain and/or superplasticity behaviors, and a maximum elongation of 600% was achieved at 400 °C with the m-value of 0.49. In addition, the active energies of WE54 alloys with different fabrication routes were examined and compared.