Enhanced compressive properties of open-cell Mg-Gd-Zn foams with long-period stacking ordered phase at elevated temperatures

摘要

The novel open-cell Mg-8Gd-2Zn (wt%) foams containing long-period stacking order (LPSO) phase were fabricated. The compressive properties of the as-cast Mg-8Gd-2Zn foams and AZ91D foams at different temperatures were investigated. The experimental results show that the Mg-8Gd-2Zn foams mainly consist of alpha-Mg, LPSO and (Mg,Zn)(3)Gd phase. As compared to the AZ91D foams, the Mg-8Gd-2Zn foams exhibit lower compressive strength at room temperature or 100 degrees C, but higher compressive strength at 200 degrees C or 300 degrees C. The energy absorption capacity of the foams is also improved at 300 degrees C. The enhanced compressive properties of the foams at elevated temperatures can be attributed to the high thermal stability of LPSO phase. (C) 2018 Published by Elsevier B.V.