Three series of Al-Si-Cu-Mg phase-change thermal storage aluminum alloy materials with different components were prepared based on Al-Si alloy through optimizing design. With the help of X-ray diffraction （XRD）

scanning electron microscope （SEM） and differential scanning calorimetry （DSC）

the microstructure

density

phase change temperature and the thermal storage properties of these materials were investigated. The results indicate that the phase transformation temperature of the alloys prepared is in the range of 500 ℃

650 ℃ with the latent heat higher than 300 J·g-1. The Al-13Si alloy has the higher heat storage per unit mass

and the Al-Si-Cu-Mg alloys have the higher heat storage per unit volume. Mg element can be used to enlarge the thermal storage temperature range due to remarkably reducing the phase transition temperature. Cu element can increase the density of the thermal storage materials

which is responsible for better thermal storage properties per unit volume.