Sn-9Zn-2Cu钎料合金等温时效组织及显微硬度  

Microstructure and microhardness of Sn⁃ 9Zn⁃ Zn⁃2Cu solder alloy during isothermal aging

作　　者：邹敏明 汪志敏[1] 程立章[1] 温瑞[1] 周灵展 李亚峰[1] ZOU Minming;WANG Zhimin;CHENG Lizhang;WEN Rui;ZHOU Lingzhan;LI Yafeng(Zhejiang Business Technology Institute,Ningbo 315012,China)

机构地区：[1]浙江工商职业技术学院,浙江宁波315012

出　　处：《兵器材料科学与工程》2024年第1期64-69,共6页Ordnance Material Science and Engineering

基　　金：浙江省2022年度高校国内访问学者“教师专业发展项目”(FX2022190);浙江省教育厅一般科研项目(Y202147924;Y202044599);浙江工商职业技术学院科研创新团队项目(KYTD202105)。

摘　　要：对Sn-9Zn-2Cu钎料合金进行了不同时长的等温时效处理,分析了合金显微组织演化,并测试了合金显微硬度。结果表明:铸态合金显微组织由β-Sn相基体、针状α-Zn相、不规则γ-Cu5Zn8相组成,合金显微硬度为16.62HV;随时效时间由24 h增至120 h,合金中的γ-Cu5Zn8相含量逐渐增多,相邻γ-Cu5Zn8相相连且形貌由不规则向树枝状转变,针状α-Zn相变短,且形貌逐渐转变为细小球状,合金显微硬度分别降至16.31HV和15.1HV;当时效时间延长至240 h和360 h时,合金显微组织无明显变化,显微硬度约为15.1HV;但当时效时间达到720 h,γ-Cu5Zn8相明显粗化,合金显微硬度降至14.09HV。The Sn-9Zn-2Cu brazing alloy was treated with isothermal aging at different time lengths,the microstructure evolution of the alloy was analyzed and the microhardness of the alloy was measured.The results show that the microstructure of the as-cast alloy consists ofβ-Sn phase matrix,acicularα-Zn phase and irregularγ-Cu5Zn8 phase,and the microhardness of the alloy is 16.62HV.With the aging time increasing from 24 h to 120 h,the content ofγ-Cu5Zn8 phase in the alloy increases gradually,the adjacentγ-Cu5Zn8 phases are connected and the morphology changes from irregular to dendritic,the acicularα-Zn phase transition is short,and the morphology gradually changes to fine spheres,and the microhardness of the alloy decreases to 16.31HV and 15.1HV,respectively.When the aging time is extended to 240 h and 360 h,the microstructure of the alloy has no obvious change,and the microhardness is about 15.1HV.However,when the aging time reaches 720 h,theγ-Cu5Zn8 phase is obviously coarsened,and the microhardness of the alloy decreases to 14.09HV.

关 键 词：Sn-9Zn-2Cu 等温时效 组织 显微硬度 

分 类 号：TJ04[兵器科学与技术—兵器发射理论与技术]