变质处理对Al-0.4Mn合金导电性能的影响机制  

Effect Mechanism of Modification Process on Electrical Conductivity of Al-0.4Mn Alloy

作　　者：郭加林 刘静 罗干 杜军[2] 周明君 GUO Jialin;LIU Jing;LUO Gan;DU Jun;ZHOU Mingjun(Guandong Huachang Group Co.,Ltd.,Foshan 528225,China;School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]广东华昌集团有限公司,佛山528225 [2]华南理工大学材料科学与工程学院,广州510640

出　　处：《机械工程材料》2022年第8期89-93,99,共6页Materials For Mechanical Engineering

基　　金：广东华昌集团有限公司委托开发项目(20200608)。

摘　　要：采用硼和稀土元素钇、钐、铈对Al-0.4Mn合金进行变质处理,研究了变质处理对合金导电性能的影响机制。结果表明:单一元素变质时,适量硼或钇元素对Al-0.4Mn合金具有良好的变质效果,合金的最高电导率分别达26.13, 25.32 MS·m^(-1),比未变质合金分别提高了6.80%和3.47%,铈和钐元素则会降低合金的电导率;质量分数0.3%硼+0.5%钇复合变质对合金电导率的提升效果更佳,其电导率为26.64 MS·m^(-1),比未变质合金提高了8.90%;当质量分数0.3%硼+0.5%钇复合变质时,因硼化作用析出的AlB同时吸附锰和钇,促进掺杂型硼化物和Al-Mn-Y相的析出,部分钇形成的AlY对锰有一定的吸附作用,二者共同作用进一步降低锰在铝中的固溶量以及基体的晶格畸变程度,从而显著提高合金的导电性能。Al-0.4 Mn alloy was modified by B and rare earth element Y, Sm and Ce. The influence mechanism of modified elements on the electrical conductivity of the alloy was studied. The results show that Al-0.4 Mn alloy could be effectively modified by right content of B or Y element when the single element was added into the alloy, and the largest electrical conductivities of alloy were 26.13, 25.32 MS·m^(-1), improving by 6.80% and 3.47% that of unmodified alloy, respectively. Ce and Sm elements would reduce the electrical conductivity of the alloy. The composite modification of 0.3 wt% B +0.5 wt% Y had a better effect on improving the electrical conductivity of the alloy;the electrical conductivity was 26.64 MS·m^(-1), improving by 8.9% that of unmodified alloy. When the alloy was composite modified by 0.3 wt% B +0.5 wt% Y, the precipitated AlBby borylation adsorbed Mn and Y at the same time, promoting the precipitation of doped borides and Al-Mn-Y phase;part of the AlY formed by Y had a certain adsorption effect on Mn, which further reduced the solid solution amount of Mn in the aluminum and lattice distortion of the substrate, and significantly improved the electrical conductivity of the alloy.

关 键 词：AL-MN合金 电导率 变质处理 晶格畸变 

分 类 号：TG146.2[一般工业技术—材料科学与工程]