固溶和时效对挤压态Cu-15Ni-8Sn合金组织和性能的影响  

Effect of solution and aging on microstructure and properties of extruded Cu-15Ni-8Sn alloy

作　　者：姜凯旋 周延军[1,2,3] 宋克兴 杨冉[1,2,3] 郁炎 柳亚辉 张彦敏[1,2,3] 陈纪东 黄宽[1] 刘东东 余勃 JIANG Kai-xuan;ZHOU Yan-jun;SONG Ke-xing;YANG Ran;YU Yan;LIU Ya-hui;ZHANG Yan-min;CHEN Ji-dong;HUANG Kuan;LIU Dong-dong;YU Bo(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology,Luoyang 471023,China;Henan Key Laboratory of Advanced Nonferrous Metals,Luoyang 471023,China;Henan Academy of Sciences,Zhengzhou 450046,China;Luoyang Ship Material Research Institute,Luoyang 471023,China;Bowei Alloy Materials Co Ltd,Ningbo 315000,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]有色金属新材料与先进加工技术省部共建协同创新中心,河南洛阳471023 [3]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471023 [4]河南省科学院,河南郑州450046 [5]中国船舶重工集团公司第七二五研究所,河南洛阳471023 [6]博威合金材料股份有限公司,浙江宁波315000

出　　处：《材料热处理学报》2023年第6期72-80,共9页Transactions of Materials and Heat Treatment

基　　金：国家重点研发计划(2021YFB3700700);国家自然科学基金(52173297,52071133);中原学者工作站资助项目(214400510028);河南省重点研发与推广专项(212102210441);河南省科学院科研开发专项(220910009)。

摘　　要：首先对挤压态Cu-15Ni-8Sn合金进行不同温度固溶处理1 h,优化出合适的固溶温度,在此基础上,对合金进行了400℃时效2 h的处理,采用光学显微镜、扫描电镜、拉伸试验及洛氏硬度计等分析了挤压态、固溶态和时效态合金的微观组织、断口形貌、抗拉强度和硬度。结果表明:挤压态合金晶界和晶内分布大量富Sn相,合金硬度为81.5 HRB,抗拉强度为597 MPa;随着固溶温度的升高,合金晶粒尺寸开始长大,第二相颗粒逐渐固溶入基体中,当固溶温度为840℃时,第二相颗粒基本完全固溶到基体中,合金晶粒尺寸为75~180μm,当固溶温度达到860℃时,晶粒出现过烧,表明合金的最佳固溶温度为840℃,此时合金的硬度为55.6 HRB,抗拉强度为396.5 MPa;时效后合金的力学性能得到显著提升:硬度为105.4 HRB,抗拉强度为839.8 MPa,与经840℃固溶处理的合金相比,分别提高了89.6%和112%。First,the extruded Cu-15Ni-8Sn alloy was solution treated at different temperatures for 1 h,and the optimum solution temperature was optimized.On this basis,the alloy was aged at 400℃for 2 h.Microstructure,fracture morphology,tensile strength and hardness of the extruded,solution treated and aged alloy were analyzed by means of optical microscope,scanning electron microscopy,tensile test and Rockwell hardness tester.The results show that a large number of Sn rich phases are distributed at the grain boundaries and in grains of the extruded alloy,the hardness of the alloy is 81.5 HRB,and the tensile strength is 597 MPa.With the increase of solution temperature,the grain size of the alloy begins to grow,and the second phase particles gradually dissolve into the matrix.When the solution temperature is 840℃,the second phase particles are almost completely dissolved into the matrix,and the grain size of the alloy is 75-180μm;when the solution temperature reaches 860℃,the grains appear overburning,indicating that the optimum solution temperature of the alloy is 840℃,at this time,the hardness of the alloy is 55.6 HRB,and the tensile strength is 396.5 MPa.After aging,the mechanical properties of the alloy are significantly improved:the hardness is 105.4 HRB,and the tensile strength is 839.8 MPa,which are 89.6%and 112%higher than those of the alloy solution treated at 840℃.

关 键 词：CU-15NI-8SN合金 固溶 时效 强度 微观组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]