Al-B-C晶种合金对6201铝合金导热及力学性能的作用机理分析  

Effect of Al-B-C Master Alloy on the Thermal Conductivity and Mechanical Property of 6201 Aluminum Alloy and Its Mechanism Analysis

作　　者：张鹏居 钱钊[1] 刘相法[1] ZHANG Pengju;QIAN Zhao(LIU Xiangfa Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Jinan 250061,China)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061

出　　处：《材料导报》2021年第9期9028-9032,共5页Materials Reports

基　　金：山东省自然科学基金项目(ZR2018MEM001);国家自然科学基金重点项目(51731007);山东大学“未来计划”青年学者项目。

摘　　要：6xxx系Al-Mg-Si合金具有较高的载流子迁移率、热导率以及较高的力学性能,可应用于电力电子设备、散热器、导体材料等,拥有广阔的发展前景。为保证器件及设备高效稳定运转,提高相关材料的散热性能是目前迫切需要解决的关键问题之一。以6201铝合金为研究对象,通过添加Al-B-C晶种合金引入Al_(3)BC粒子及AlB_(2)相,将硼化处理与第二相强化相结合促使合金导热性能与强度同时提升;同时,对材料的微观组织、晶粒尺寸及断口形貌进行了分析表征。通过该方法使得材料热导率提升至210.02 W/(m·K),相比原始合金提升了22.5%。200℃下材料的屈服强度、抗拉强度分别提升至245 MPa、250 MPa。The 6xxx series Al-Mg-Si alloys have properties such as relatively high carrier mobility,high thermal conductivity,and higher mechanical pro-perties.It have broad development prospects and can be applied in electric equipment,heat sink,conductive materials,etc.In order to ensure the rapid and efficient operation of the equipment,improving the heat-conducting performance of the material is an urgent problem to be solved for industry.In this work,the 6201 aluminum alloy was investigated.The Al-B-C master alloy was added into the 6201 alloy to introduce Al 3BC and AlB_(2) particles,and the combination of boron-treatment and secondary-phase strengthening promoted the simultaneous improvement of thermal conductivity and strength of the material.The microstructure,grain size and fracture morphology of the materials were characterized and analyzed.Through this method,the thermal conductivity of 6201 alloy was increased to 210.02 W/(m·K),which was by 22.5% higher than the pristine material.The yield strength and tensile strength were increased to 245 MPa and 250 MPa respectively at 200℃.

关 键 词：6201铝合金 Al-B-C晶种 热导率 强度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]