【作者】 亚斌； 王胜永； 郭福林； 孟凡淇； 丁兆俊； 周秉文； 孟令刚； 张兴国；

【Author】 Bin Ya;Shengyong Wang;Fulin Guo;Fanqi Meng;Zhaojun Ding;Bingwen Zhou;Linggang Meng;Xingguo Zhang;Dalian University of Technology;Ningbo Institute of Dalian University of Technology;

【机构】 大连理工大学； 大连理工大学宁波研究院；

【摘要】 本文采用石墨模具浇铸、铜模法和水平连铸三种方法,分别制备了Cu-1Ag、Cu-2Ag、Cu-3Ag、Cu-4Ag合金样品,且采用拉停和匀速两种水平连铸方法制备了Cu-4Ag合金样品。利用金相显微镜,扫描电镜,显微硬度计和电导率测试仪,研究了冷却速度和Ag含量对Cu-Ag合金组织性能的影响。结果表明,冷却速度快的铜模法制备的Cu-Ag合金样品晶粒较小,冷却速度较慢的石墨模具浇铸法制备的Cu-Ag合金样品晶粒较大。水平连铸的Cu-Ag合金样品的组织主要是以近似沿着轴向生长的树枝晶为主,并且冷却速度较快的匀速水平连铸法制备的Cu-4Ag合金样品(均速1mm/s)组织比拉停水平连铸Cu-4Ag合金样品(均速0.85mm/s)组织更加致密。随着Ag含量提升,会析出富Ag非平衡共晶相,且尺寸逐渐变大,形状逐渐不规则。冷却速度提升,可以显著提升Cu-Ag合金性能,冷却速度最快的铜模法制备的Cu-Ag合金样品性能最好,其中Cu-2Ag合金样品,显微硬度达到77.74HV,电导率达到87.08%IACS。冷却速度较快的匀速水平连铸Cu-4Ag合金样品硬度高于拉停水平连铸Cu-4Ag合金样品,显微硬度达到80.36HV。Ag含量对Cu-Ag合金电导率影响较小,随着Ag含量提升,Cu-Ag合金显微硬度先上升后下降。更多还原

【Abstract】 In this paper,Cu-1Ag,Cu-2Ag,Cu-3Ag and Cu-4Ag alloy samples were prepared by graphite mold casting,copper mold casting and horizontal continuous casting,and Cu-4Ag alloy samples were prepared by two horizontal continuous casting methods:pull-stop and constant speed. The effects of cooling rate and Ag content on the microstructure properties of Cu-Ag alloys were studied by means of metallographic microscope,scanning electron microscope,microhardness tester and conductivity tester. The results show that Cu-Ag alloy samples prepared by copper mold with fast cooling rate have smaller grain size,while those prepared by graphite mold casting with slow cooling rate have larger grain size. The microstructure of Cu-Ag alloy samples from horizontal continuous casting is mainly dendrites growing approximately along the axis,and the microstructure of Cu-4Ag alloy samples prepared by uniform horizontal continuous casting method(mean speed 1mm/s)with faster cooling rate is denser than that of Cu-4Ag alloy samples from pull-stop horizontal continuous casting(mean speed 0.85mm/s). With the increase of Ag content,Ag-rich nonequilibrium eutectic phase will be precipitated,and the size will gradually increase and the shape will gradually become irregular. With the increase of cooling speed,the properties of Cu-Ag alloy can be significantly improved. The Cu-Ag alloy samples prepared by copper molding method with the fastest cooling speed have the best properties,among which the Cu-2Ag alloy samples have microhardness of 77.74HV and electrical conductivity of 87.08%IACS. The hardness of Cu-4Ag alloy prepared by uniform horizontal continuous casting with higher cooling rate is higher than that of Cu-4Ag alloy prepared by pull-out horizontal continuous casting,and the microhardness reaches 80.36 hv. With the increase of AG content,the microhardness of cu-Ag alloy increases first and then decreases.更多还原