Mn含量对Cu-Mn合金结构与性能的影响

基于Cu-Mn中间层可改善Cu与CuCrZr合金的连接性能,采用高能球磨法制备Cu-Mn合金粉末,研究烧结温度为650~850℃、Mn含量(质量分数)为10%~50%的Cu-Mn合金的烧结性能。结果表明:随Mn含量增加,Cu-Mn合金的相对密度和抗拉强度先增大后减小,但Mn含量过高时生成较多的Mn O,导致合金性能下降;随烧结温度升高,合金的相对密度和抗拉强度增大。850℃下烧结的67Cu-33Mn合金孔隙较小、组织均匀,其相对密度和抗拉强度均达到最大值,分别为91.62%和610.91 MPa,表明67Cu-33Mn合金具有最佳的烧结活性,宜作为Cu与CuCrZr合金连接的中间层。

Effect of Mn content on microstructure and properties of Cu-Mn alloys

In order to improve the bonding properties of Cu to CuCrZr, Cu-Mn alloys with Mn mass fraction of 10%?50% were prepared by high energy ball milling and solid-phase sintering (650?850℃). The effects of Mn content on sintering properties of Cu-Mn were studied. The results show that the relative density and strength of the Cu-Mn alloy increases, and then decreases with increasing the Mn content; With further increase of Mn content, more MnO phase appears, which results in the properties of Cu-Mn alloy decreasing. With increasing sintering temperature, the relative density and tensile strength of the Cu-Mn alloy increase. When being sintered at 850℃, the optimum properties of 67Cu-33Mn alloy with homogenous microstructure and small pores are obtained, the maximum values of relative density and tensile strength are 91.62% and 610.91 MPa, respectively. Therefore, 67Cu-33Mn alloy can be used as the interlayer between Cu and CuCrZr alloy.