The effects of isochronal aging treatment on compressive strength and energy absorption behavior of the Al-0.16Sc-0.08 Zr foams with homogeneous pore structure and porosity of 71.5%

7

2.5%

which was fabricated by melt-foam method

were investigated.The results show that the foams exhibit homogeneous spherical pore structure with pore size approximately 0.9mm.Due to trace Zr content

the absence of primary Al3（Zr

Sc）phase in the matrix can be observed.The compressive strength of the alloy foams is increased firstly and then decreased with increasing in temperature during isochronal aging between 200 ℃ and 600 ℃.The sample shows the desirable compressive strength and energy absorption capacity with aged at 400 ℃.The heat treatment can lead to the decrease of the cell-wall plasticity

which is beneficial for the energy absorption efficiency and the peak stage prolonging.The microstructure observation of the cell wall at 400℃shows the precipitation of nano-size Al3（Sc

Zr

Ti）particles existing coherent with Al matrix with a radius of 2.9

4

.8nm.These Al

3

（Sc

Zr

Ti）particles can inhibit the grain boundary sliding and dislocation movement

strengthening the cell walls and improving the compressive strength as well as energy absorption behavior of the foams.