On some aspects of compressive properties and serrated flow in Mg-Y-Nd-Zr alloy

The deformation behavior of the Mg-Y-Nd-Zr (WE54) alloy at temperatures between 25 and 400°C was investigated by uniaxial and plans strain compression tests at strain rate values of 10−2 and 10−4 s−1. The results showed that the flow stress had a strong dependency on the loading condition. Yield stress and peak stress decreased with increasing deformation temperature and with decrease in the strain rate for both deformation types. The serration flow behavior was observed markedly at high temperatures and under a strain rate of 10−4 s−1. The serration amplitude for samples deformed by plans strain compression was larger than that by uniaxial compression. Serrated flow was attributed to the interaction of dislocations with precipitates at 300°C and to dynamic discontinuous recrystallization effects at 400°C.

Stress-strain curves of WE54 alloy deformed by UC and PSC at 300 and 400 °C under strain rate of 10−2 s−1 (a) and 10−4 s−1 (b)Figure optionsDownload as PowerPoint slide