| 摘要 |
PROBLEM TO BE SOLVED: To improve the machinability of a brass material in whichγ-phase is utilized to improve machinability by performing an optimization of crystal structure (such as the promotion of embrittlement ofγ-phase, the reduction of ductility ofα-phase). SOLUTION: The effect of improving machinability can be increased by incorporating theγ-phase in amounts of 5-40% into the crystal structure and also carrying out the control of the grain size/shape of theγ-phase, the addition of the third element, and the control of the phase ratio ofβ-phase.
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