Y对铸态Cu-15Ni-8Sn合金性能及Sn元素分布的影响

LIU Dong-dong,SU Juan-hua,YANG Ran,ZHOU Yan-jun,ZHANG Yan-min,LIU Ya-hui,ZHANG Chao-min,YU Yan,CHEN Ji-dong,HUANG Kuan,JIANG Kai-xuan,YU Bo

Transactions of Materials and Heat Treatment（2023）

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Abstract

利用传统熔铸法制备了 Cu-15Ni-8Sn和Cu-15Ni-8Sn-0.57Y合金,通过光学显微镜(OM)、扫描电镜(SEM)和直读光谱仪等研究了 Y元素对铸态Cu-15Ni-8Sn合金的组织、力学性能和Sn元素分布的影响.结果表明:添加Y能细化铸态Cu-15Ni-8Sn合金的枝晶形貌,使合金中层片状过渡组织(α+γ相)减少,并且可以抑制Sn元素的宏观偏析,铸锭中部和下部Sn元素宏观偏析程度分别改善了 28％和9％;此外添加Y元素后,Cu-15Ni-8Sn合金硬度由108 HB增加到116.3 HB,导电率由9.834％IACS下降到 6.634％IACS.

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