Si、Cu和热处理工艺对Al-Si合金电导率的影响  

Effect of Cu, Si and Heat Treatment on the Conductivity of Al-Si Alloys

作　　者：李斌[1] 杨昭[1,2] 杨续跃[1] 李绍康 许德英 

机构地区：[1]中南大学,湖南长沙410083 [2]广州钢铁集团,广东广州510381

出　　处：《稀有金属材料与工程》2015年第11期2857-2861,共5页Rare Metal Materials and Engineering

基　　金：广州钢铁集团和广州金邦有色合金有限公司合作资助项目

摘　　要：通过电导率测量、金相观察、扫描电镜分析和X射线衍射分析,研究了Si含量、Cu含量和热处理工艺对Al-Si系铸造合金晶格常数和电性能的影响规律。结果表明:Si和Cu元素的添加会减小合金的电导率;当Si含量超过固溶极限后,Si含量的变化对晶格畸变程度影响不大,合金的电导率受Si相的体积百分数控制;而Cu在固溶极限内时,随其含量的增加,晶格畸变程度增大,合金的电导率可根据铝基体晶格常数的偏离量来评估;经过450℃,5 h+250,2 h热处理工艺,晶格畸变程度明显降低,合金的电导率有明显提高,增幅最高可达32%。The effects of the content of Cu and Si elements as well as heat treatment on the lattice constant and electrical properties of Al-Si alloys were investigated by Wheatstone bridge conductivity measurement,optical microscope,scanning electron microscope and X-ray diffraction analysis.The results indicate that increasing the content of Si and Cu can decrease the conductivity of Al-Si alloy.When Si content is larger than its solubility in Al,variation of Si content has less influence on the lattice constant,and the resistivity of Al-Si alloy is determined by the volume percentage of Si.When Cu content is within its solubility in Al,the increase of Cu content would increase the distortion of aluminum lattice;consequently,the influence of Cu can be estimated according to Al lattice constant deviation.After heat treatment（450 ℃×5 h＋250 ℃×2 h）,the distortion of the matrix lattice decreases significantly,and the electrical conductivity of Al-Si alloys improves obviously with the increment up to 32%.

关 键 词：晶格畸变 电导率 AL-SI合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]