在α单相黄铜基础上，通过调整Bi含量，并添加Mn、稀土元素La等，研制了一种新型无铅易切削铋黄铜。实验中采用高频感应炉熔铸出铸锭，并进行热压、退火等处理制得试样；然后通过扫描电镜观察其微观组织、X射线衍射分析其物相，并研究了其力学、抗脱锌和切削性能。结果表明，配方为：Bi0．5％，Mn1．0％，Zn35％，La0．1％，铜余量所制得的试样，其各种性能均达到或超过铅黄铜HPb59—1，故可取代铅黄铜。
A new type of lead free free-cutting brass was developed based on the α-phase brass. The as-prepared alloys were produced by casting in an induction furnace, then hot extruding and finally annealing treatment. In the experiment process, the Bi content was precisely controlled. Mn element and as well as rear earth element La were added into the products. Mierostrueture of the specimen was characterized by scanning electron microscopy (SEM) and the phase composition was analyzed by X-ray diffraction (XRD). The mechanical, dezincification and cutting properties were also studied. The results show that the as-prepared lead free free-cutting brass sample containing 0. 5% Bi, 1.0% Mn, 35% Zn and 0. 1% La exhibits better performance than HPb59-1 brass and can replace the HPb59-1 brass.
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