【摘要】 大气条件下熔炼的Cu-15Ni-10Mn合金铸态组织具有典型的树枝晶特征,枝间中Ni含量比枝干中稍高,枝干中Mn含量比枝间中稍高。由于Mn容易氧化吸气,使得铸态合金的加工性能不能满足要求。试验通过在熔炼过程添加少量的Zn,有利于降低合金中含气量,同时添加微量Co减小枝晶尺寸,使之满足加工要求。试验研究表明:Co与Cu形成的Co0.52Cu0.48化合物。添加微量Co对Cu-15Ni-10Mn合金的铸态组织起到明显的细化作用,其枝晶尺寸随Co含量的增加而减小,添加0.6%Co的合金的枝晶尺寸只有未添加Co合金的晶粒尺寸的31.7%。添加钴的合金硬度的峰值出现在0.6%Co处,其值为HV175,比未添加Co的Cu-15Ni-10Mn合金的硬度增加了66.1%;微量Co的存在会略降低合金的导电率。更多还原

【Abstract】 Cu-15Ni-10 Mn alloy as-cast was smelted at atmosphere, which has a typical dendrite structure, the Ni content is higher on dendrite arm spacing than on the dendrite, but the content of Mn is less on dendrite arm spacing than on the trunk. Due to the easy oxidization of Mn, the performance of alloy as-cast can not meet the requirements of metalworking. The gas content can be reduced by adding a small amount of zinc during smelting, and the metalworking features can be improved by adding trace element of Co to reduce the dimension of dendrite arm and space of arms. The research results show that Co and Cu forms Co0.52Cu0.48 compound. The size of dendrite of as-cast Cu-15Ni-10 Mn alloy can be refined by trace amount of Co. The size decreases with the increase of the Co content, the dendrite size of alloy with 0.6% Co decreases 31.7% compared with the alloy without Co. The peak of hardness of the alloy with 0.6% Co is HV 175 that is 66.1% higher than the alloy without Co. Co decreases the electrical conductivity of as-cast Cu-15Ni-10 Mn alloy.更多还原