The ageing of aluminium alloy by removing the piece into the oven at 540. when you reach the temperature set, remove from stove and cool down in the water. After that, Polishing to the sandpaper belt to the smooth surface and leave at room temperature for a various period time. then bring the test the hardness. Why leave it at room temperature at various period time, in order to compare the strengths of various period time with leave at room temperature. Thereafter, the piece that are left at room temperature for a period equal time bring to kiln per 1 minute, 1 hour, 2 hour and 4 hour at 170 , in order to make a comparison of the strength with time of ageing. By the benefits that result from the ageing precipitation is a piece have the increase strength with speed. Do not take a long time.