Analysis of Micro Structure of Result Casting on Drum Aluminium Music With Metal Molding

Abstract

Metal casting is the production process in forming a cast by pouring hot liquid metal into a mold then allowed to cool and freeze. Metal molds are molds that are used once cast produces many castings so that the productivity is high and economically suitable and suitable for small objects. The diameter of granules of metal castings is strongly influenced by the material of castings and the hardness of the material. The smaller the diameter of the granules the hardness of the cast is higher and brittle, on the contrary the greater the diameter of the granules the harder the lower and soft. The microstructure test results that the diameter of Zn granules is larger than the Aluminum granules. The result of microstructure testing of lug foundry containing 99.9% Al indicates in this alloy that aluminum is verydominant even close to pure aluminum so that in picture of element of silicon is very small. The larger the diameter of the granules the material hardness is lower and soft. The smaller the grain diameter the higher the hardness of the material and the brittle. Hardness Al lug alloy castings are higher than the original lug Zn alloys. This is because the diameter of aluminum granules is smaller than the diameter of granules Zn.