The invention discloses a non-heat-treated self-strengthening aluminum and
magnesium alloy and a preparation technology thereof. The preparation technology comprises technological steps as follows: firstly, melting pure aluminum, heating the pure aluminum to the temperature of 680 DEG C, adding pure
magnesium ingots, performing heat preservation after the pure
magnesium ingots are molten, adding intermediate alloys AL-Si and AL-Mn into an
alloy liquid heated to the temperature of 740-760 DEG C, and performing heat preservation at the temperature of 740 DEG C after the alloys are molten; secondly, heating the
alloy liquid to the temperature of 780 DEG C, adding
misch metal, removing surface scums after the
misch metal is molten, stirring the alloy liquid, heating the alloy liquid to the temperature of 770-780 DEG C, performing the heat preservation and leaving the alloy liquid to stand for 30 min; finally, cooling the alloy liquid to the temperature of 750 DEG C for refining, removing
slag and gas after refining is performed for 15 min, and finishing
casting production. According to the non-heat-treated self-strengthening aluminum and
magnesium alloy and the preparation technology thereof, the
misch metal and the elements including Mn and Mg in a strict
mole fraction ratio are adopted for refining dendritic
crystal composition of Mn and Mg in the aluminum alloy material, and one aluminum and
magnesium alloy with
high heat resistance, high elongation percentage and excellent deformability is obtained.