垂直半连续铸造Cu-15Ni-8Sn合金组织及性能研究  

Microstructures and Properties of Cu-15Ni-8Sn Alloy Prepared by Vertical Semi-Continuous Casting

作　　者：郭中凯 接金川 李廷举[2,3] GUO Zhongkai;JIE Jinchuan;LI Tingju(School of Opto-electronic Engineering,Zao Zhuang University,Zaozhuang 277160,China;Ningbo institute of Dalian University of Technology,Ningbo 315000,China;School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]枣庄学院光电工程学院,山东枣庄277160 [2]大连理工大学宁波研究院,浙江宁波315000 [3]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《铜业工程》2023年第6期70-79,共10页Copper Engineering

基　　金：山东省自然科学基金项目(ZR2023QE031);宁波市科技创新2025重大专项(2021Z051)资助。

摘　　要：采用垂直半连续铸造法制备Cu-15Ni-8Sn合金,并对合金的凝固组织、元素偏析以及热处理后的组织和性能进行了分析。采用普通熔铸法制备Cu-15Ni-8Sn合金的铸态组织主要由贫Sn的α-Cu(Ni,Sn)固溶体、富Sn的γ相以及片层状的(α+γ)组成,并且Sn元素主要偏聚在晶界上。在垂直半连续铸造的过程中同时施加机械振动和电磁场具有明显的晶粒细化效果,同时有效减轻了Sn元素的宏观反偏析和微观晶界偏析,富Sn相比较均匀地分布在晶粒内部和晶界上。Cu-15Ni-8Sn合金经过850℃固溶、90%轧制和400℃时效1 h后可获得最佳的综合性能,此时合金的硬度为HV401,导电率为8.4%IACS,抗拉强度为1233MPa,屈服强度为1185MPa,伸长率为4.5%。The vertical semi-continuous casting method was applied to successfully prepare Cu-15Ni-8Sn alloy,the solidification struc‐ture,element segregation,the microstructure and properties after heat treatment were systematacially analysed.The casting structure of Cu-15Ni-8Sn alloy prepared by conventional casting consisted of Sn-depletedα-Cu(Ni,Sn)solid solution,Sn-richγphase,and lamel‐lar(α+γ)structure,and the Sn element mainly segregated at grain boundaries.The grain refinement can be reached by vertical semi-continuous casting equipped with mechanical vibration(MV)and electromagnetic field(EMF)simultaneously,the Sn-richγphase dis‐tributed uniformly in grain interior and on grain boundaries,which reduces the degree of the inverse macro-segregation and micro-segre‐gation at grain boundaries of Sn element.The optimal properties with a hardness of HV 401,an electrical conductivity of 8.4%IACS,an ultimate strength of 1233 MPa,a yield strength of 1185 MPa,and an elongation of 4.5%can be obtained in the sample after solution treatment at 850°C,rolling treatment with 90%deformation and aging at 400°C for 1 h.

关 键 词：CU-15NI-8SN合金 晶界 垂直半连续铸造 微观组织 力学性能 

分 类 号：TG290[金属学及工艺—铸造]