Influence of precipitate phase on the strain rate sensitivity of Mg-Gd-Y Alloy

摘要

Supersaturated Mg-Gd-Y alloy followed by aging at 225°C with different times were subjected to quais-static and dynamic strain rates to determine the influence of precipitate phase β' on the strain rate sensitivity of magnesium alloy. Strain rate sensitivity (SRS) decreases with the increase of the size of β'. SRS decreases from initial condition to peak-aged condition due to the β' increases the athermal component of flow stress. On the other hand, the influence of precipitate interfaces on dislocation generation and storage mechanisms may be responsible for the decrease of SRS from peak-aged to over-aged condition.