微量镧对Cu-Ni-Si合金铸态组织及性能影响研究  

Effect of Lanthanum Microalloying on Microstructure and Properties of As-Cast Cu-Ni-Si Alloy

作　　者：刘劲松[1,2] 武安琪 王松伟 陈帅峰 张孟枭 宋鸿武[2] 张士宏[2] Liu Jinsong;Wu Anqi;Wang Songwei;Chen Shuaifeng;Zhang Mengxiao;Song Hongwu;Zhang Shihong(School of Material Science and Engineering,Shenyang Ligong University,Shenyang 110159,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Met-al Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]中国科学院金属研究所,师昌绪先进材料创新中心,辽宁沈阳110016

出　　处：《中国稀土学报》2023年第5期930-941,I0003,共13页Journal of the Chinese Society of Rare Earths

基　　金：中国科学院重点部署项目(ZDRW-CN-2021-3)资助。

摘　　要：通过光学金相、能谱分析、电子背散射衍射以及拉伸试验、电化学实验等手段研究了微量La对某Cu-Ni-Si系合金(C7025)铸态宏微观组织、力学性能及抗腐蚀性能的影响。结果表明:适量的La可显著细化铸态组织,随着La含量的增加,基体中第二相由颗粒状变为长条状,且沿晶界分布;在铸锭中加入适量La可提高合金的屈服强度和抗拉强度,添加0.044%(质量分数)La时屈服强度和抗拉强度可达最大值分别为322.2和444.8 MPa,同时发现,Cu-Ni-Si系合金的屈服和抗拉强度随La含量继续提高呈现独特的“M”形变化趋势;当La添加量为0.17%时,晶粒平均尺寸最小为95.3μm;此外适量La的添加可提高合金耐蚀性,La含量为0.17%时耐蚀性最好。The effects of rare earth La on the microstructure,mechanical properties and corrosion resistance of a Cu-Ni-Si alloy(C7025)were studied by means of optical metallography,energy spectrum analysis,electron backscatter diffraction,tensile test and electrochemical test.The results show that addition of appropriate La content can obviously refine the as-cast structure,with the increase of La content,the morphology of second phase in the matrix changes from granular shape to long strip and distributed along grain boundary.The yield strength and tensile strength of the alloy can be improved by adding proper amount of La.The yield strength and tensile strength can reach 322.2 and 444.8 MPa respectively with adding 0.044%La.Meanwhile,it is founded that the addition of La results in an unique M-shape relation between La contents and yield/tensile strength;The minimum average grain size is 95.3μm as the addition amount is 0.17%;Furthermore,the addition of La can improve the corrosion resistance of the alloy,which can be the best as the addition amount is 0.17%.

关 键 词：CU-NI-SI合金 稀土微合金化 铸态组织 力学性能 耐蚀性 

分 类 号：TG146.1[一般工业技术—材料科学与工程]