摘要
作为重要的导电导热材料,铜在高温下的晶粒尺寸热稳定性是目前新能源、电子通信等领域的研究热点.利用电子背散射衍射、透射电子显微镜以及高角度环形暗场扫描透射进行分析,研究微量Mg元素添加对铜在高温热暴露下的晶粒长大行为及织构演变的影响规律.结果表明:0.12%(质量分数,下同)的Mg元素添加可以明显地提高铜在高温下的晶粒尺寸热稳定性.纯铜经650℃/10 min和950℃/10 min热暴露后的平均晶粒尺寸为58.2,198.0μm,添加0.12%的Mg元素后,铜合金经650℃/10 min和950℃/10 min热暴露后的平均晶粒尺寸为23.5,82.5μm.此外,0.12%的Mg元素添加明显弱化了铜合金在高温热暴露后的立方织构(Cube){001}<100>,提高了合金中黄铜织构(Brass){110}<112>和铜型织构(Copper){112}<111>的体积分数.Mg元素添加使铜合金形成了10~20 nm的细小γ(Cu_(2)Mg)相,这些γ相对晶界具有明显的钉扎作用,可以抑制晶粒的生长,使铜合金具有较好的晶粒尺寸热稳定性,并且对合金电导率的影响较小.
As a main thermal-conductivity material,the grain size thermal stability of copper at high temperature has been a current hotspot in the fields of new energy resource and electronic communication.In this study,electron backscatter diffraction,transmission electron microscopy and high-angle annular dark-field scanning transmission election microscopy are used to study the influence of trace Mg element addition on the grain growth behaviour and texture evolution of copper alloy during high-temperature exposing.Results show that the addition of 0.12%(mass fraction,below the same)Mg element can significantly improve the grain size thermal stability of copper at high temperatures.The average grain sizes of pure copper after 650℃/10 min and 950℃/10 min exposure are 58.2μm and 198.0μm,respectively.After adding 0.12% Mg element,the average grain sizes of copper alloy exposed at 650℃ and 950℃ for 10 min are 23.5μm and 82.5μm,respectively.Besides,the addition of 0.12% Mg significantly weakens the Cube texture 1001<100>of copper suffering high temperature,and increases the Brass texture{110}<112>and Copper texture{112}<111>.The Mg element addition leads to the formation of fine γ(Cu_(2)Mg)phase with the size of 10~20 nm in copper alloy.At high temperatures,phase particles exert an obvious pinning effect on grain boundaries,which thereby hinders the growth of grains,and attributes to the great grain size thermal stability of copper at high temperatures with a minor effect on the conductivity of alloy.
作者
谢功园
陈宇强
刘文辉
潘素平
宋宇峰
刘阳
谭欣荣
XIE Gongyuan;CHEN Yuqiang;LIU Wenhui;PAN Suping;SONG Yufeng;LIU Yang;TAN Xinrong(Hunan Provincial Key Laboratory of New Energy Storage and Conversion of Advanced Materials,Hunan University of Science and Technology,Xiangtan 411201,China;Advanced Research Center,Central South University,Changsha 410083,China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2023年第2期117-124,共8页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(52075166)。
关键词
Mg元素
铜合金
晶粒尺寸
织构
Magnesium element
Cu alloy
grain size
texture
