A non-ferrous metal matrix is formed by adding another or several metallic or non-metallic components to form a substance with both the similarity of matrix metal and certain properties, which is called non-ferrous metal alloys. Non-ferrous alloy can be divided into aluminum alloy, copper alloy, magnesium alloy and titanium alloy according to the matrix metal; According to its production method, it can be divided into casting alloy and deformation alloy; According to the number of elements, the alloys can be divided into binary alloys, ternary alloys, quaternary alloys and multivariate alloys. Generally speaking, when the total alloying element content is less than 2.5%, it is a low alloy. Medium alloy with 2.5%~10% content, high alloy with more than 10% content. Alloys have properties superior to pure metals.