Aluminum alloy is a relatively young metal material, in the beginning of twentieth Century,the industrial
application. During the Second World War, the aluminum is mainly used for military aircraft. After the
war, due to the military industry of aluminum demand plummeted, the aluminum industry started civil
aluminum alloy development, make its scope of application by the aviation industry is extended to all
sectors of national economy in construction, container and packaging industry, transportation industry,
electrical and electronic industry, machinery manufacturing industry, petrochemical industry, etc., applied
to people's daily life. Now, the amount of aluminum, a wide range,after steel, become the second metal
materials. Rapid development of aluminum applica tion is the result of the development of new aluminum
alloy material in the world.