Mn含量对铸态Cu-Ni-Cr合金组织和性能的影响  

Effect of Mn content on microstructure and properties of as-cast Cu-Ni-Cr alloy

作　　者：朱莹莹 国秀花[1,2] 李韶林 宋克兴[1,2,3] 王强松 孙文明[1] ZHU Ying-ying;GUO Xiu-hua;LI Shao-lin;SONG Ke-xing;WANG Qiang-song;SUN Wen-ming(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Key Laboratory of Non-ferrous Materials Science and Processing Technology,Henan University of Science and Technology,Luoyang 471023,China;Henan Academy of Sciences,Zhengzhou 450052,China;State Key Laboratory of Nonferrous Metals and Processes,GRINM Group Co Ltd,Beijing 100088,China;GRIMAT Engineering Institute Co Ltd,Beijing 101407,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省有色金属材料科学与加工技术重点试验室,河南洛阳471023 [3]河南省科学院,河南郑州450052 [4]有研科技集团有限公司有色金属材料制备加工国家重点试验室,北京100088 [5]有研工程技术研究院有限公司,北京101407

出　　处：《材料热处理学报》2024年第1期103-112,共10页Transactions of Materials and Heat Treatment

基　　金：中国博士后科学基金(2020T130172,2020M682288);河南省科技攻关项目(222102230064);河南省博士后科研项目(202002063);河南省高等学校重点科研项目(21A430014);河南省科技研发计划联合基金(222103810037)。

摘　　要：采用大气熔炼制备了Cu-Ni-Cr-xMn(x=0、1、3、5、7和9 mass%)合金,采用光学显微镜、扫描电镜、X射线衍射仪和电子万能试验机等研究了Mn含量对铸态Cu-Ni-Cr-xMn合金显微组织和性能的影响。结果表明:铸态Cu-Ni-Cr-xMn合金的组织由富Cu相(γ1)、富Ni相(γ2)和富Cr相组成,Mn的添加显著改变了Cu-Ni-Cr-xMn合金组织中第二相的偏聚形式。Mn的加入使Cu-Ni-Cr-xMn合金组织中的Cr元素在富Ni区显著聚集,富Ni区的Cr含量显著增高。随着Mn含量的增加,基体上结节状富Ni相(γ2)和富Cr相尺寸减小,分布更加均匀,大量细小富Cr第二相的存在显著提升了合金的力学性能。当Mn含量为3%时,小尺寸富Cr第二相开始在晶界处偏聚形成链状结构,对合金的力学性能产生了不利影响。当Mn含量为7%时,Mn原子固溶强化及第二相细化效果显著,合金的力学性能最佳,其硬度和抗拉强度分别为195.06 HB和401 MPa。Cu-Ni-Cr-xMn(x=0,1,3,5,7 and 9 mass%)alloys were prepared by atmospheric melting,and the effect of Mn content on microstructure and properties of as-cast Cu-Ni-Cr-xMn alloys was studied by means of optical microscope,scanning electron microscopy,X-ray diffractometer and electronic universal testing machine.The results show that the microstructure of the as-cast Cu-Ni-Cr-xMn alloys is composed of Cu-rich phase(γ1),Ni-rich phase(γ2)and Cr-rich phase,and the addition of Mn significantly changes the segregation form of the second phase in the microstructure of the Cu-Ni-Cr-xMn alloys.The addition of Mn significantly aggregates the Cr element in the Cu-Ni-Cr-xMn alloys microstructure in the Ni-rich zone,and the Cr content in the Ni-rich zone increases significantly.As the Mn content increases,the size of nodular Ni-rich phase(γ2)and Cr-rich phase in the matrix decreases,and their distribution becomes more uniform.The existence of a large number of fine Cr-rich second phase significantly improves the mechanical properties of the alloys.When the Mn content is 3%,the small-sized Cr-rich second phase begins to segregate at the grain boundaries and form a chain like structure,which has a negative effect on the mechanical properties of the alloy.When Mn content is 7%,the effect of Mn atom solid solution strengthening and second phase refinement is significant,and the mechanical properties of the alloy are the best,with a hardness of 195.06 HB and a tensile strength of 401 MPa,respectively.

关 键 词：Cu-Ni-Cr-xMn合金 显微组织 性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程]