To improve the utilization of Sc in the Al-Mg-Sc-Zr alloy

effects of squeeze casting on precipitation behaviors and mechanical properties of Al-5.36Mg-0.40Mn-0.16Sc-0.14Zr（mass fraction

%）alloy were investigated by optical microscopy（OM）

scanning electron microscopy（SEM）

transmission electron microscopy（TEM）and tensile tests.The results show that precipitates on grain boundaries are more dispersed in the squeeze casting than in the permanent mould casting.Few primary Al3（Sc

Zr） microparticles can be observed in the squeeze casting

and the average grain size is grown slightly.Although the yield strength of the samples in two casting methods is nearly the same

the tensile strength and elongation of the samples in the squeeze casting are higher than those in the permanent mould casting.After 350℃/12hannealing

the Al3（Sc

Zr）nanoparticles are precipitated from the matrix both in squeezing casting and in permanent mould casting

however

there are more Al3（Sc

Zr）nanoparticles precipitated in the squeezing casting

showing a stronger precipitation strengthen effect

where the yield strength of the alloy is 25MPa higher than that in the permanent mould casting.