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Copper and silicon, principal alloying elements of copper-silumin, seem to have effects on mechanical properties and machinability of the copper-silumin. shearing angle, friction angle, etc. are discussed. The results obtained were as follows: In the alloys containing copper, the chip formation was almost equal to the flowing type with the formation of built-up edge; but in the alloys containing no copper, it was close to a tearing or shearing type and the chip thickness was extremely increaseddoi:10.2464/jilm.22.417 fatcat:w54sh3kex5cxbosb6ajqpv6jwa