Effect of Nd on high temperatures deformation and corrosion behavior of AZE Mg alloy

An extruded AZE Mg alloy (Mg-3Al-1Zn-0.6Nd) has been developed and prepared to examine the effect of the precipitated phase on corrosion and hot deformation behavior. High-temperature compression experiments show that dynamic recrystallization (DRX) occurs at various experimental parameters (473 to 673 K and 1×10-4 s-1 to 1×10-3 s-1). The deformation mechanism is dominated by dislocation slip and/or twinning. Al11Nd3 precipitates with two different sizes could impede nucleation and the growth of DRXed grains. Serrated flow occurred owing to the interactions between dislocations and precipitates. The corrosion current density decreases with the addition of Nd elements. Moreover, the continuous precipitation of the Al11Nd3 phase at grain boundaries reduces the corrosion rate in NaCl solution, thereby enhancing the corrosion resistance of AZE alloys.

Methods
The flow curve data were measured in a vacuum high temperature universal tensile compressor, and the compression curves of AZE alloys at five temperatures were tested at three different strain rates; the corrosion performance tests were measured in an electrochemical workstation, and the corrosion current densities and capacitance loops of AZE alloys were measured at a stable operating voltage, respectively.