Fe元素微量添加对Al-5Ni高导热合金性能及流变行为的影响  

Effects of Trace Addition of Fe Element on Properties and Rheological Behavior of Al-5Ni Alloys with High Thermal Conductivity

作　　者：钟扬霖 胡永俊[1] 王康 李文芳 王志玉 廖忠淼 ZHONG Yanglin;HU Yongjun;WANG Kang;LI Wenfang;WANG Zhiyu;LIAO Zhongmiao(Institute of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China;Institute of Materials Science and Engineering,Dongguan University of Technology,Dongguan 523808,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]东莞理工学院材料科学与工程学院,广东东莞523808

出　　处：《热加工工艺》2023年第8期44-48,53,共6页Hot Working Technology

基　　金：广东省基础与应用基础研究基金项目(2021A1515010587,2019A1515110135);广东省重大科技专项资金项目(2020B0301030001);广东省普通高校创新团队项目(2021KCXTD022)。

摘　　要：Al-Ni近/共晶合金兼具高强韧和高导热性能,Ni在Al中的共晶成分点较其他常见过渡族元素更高,其铸件在热管理材料领域具有可观的应用潜力。研究了微量添加Fe元素对Al-5wt%Ni合金的微观组织、导热系数、力学性能和流变行为的影响。结果表明,Al-5wt%Ni中添加0.1wt%Fe元素可实现α-Al晶粒的显著细化,(α-Al+Al3Ni)共晶组织球化且第二相分布更为均匀。当Fe元素添加量在0.1wt%时,Al-5wt%Ni合金导热系数和力学性能同步提升,导热系数由211.4 W/(m·K)提升到218.8 W/(m·K),抗拉强度由132.5 MPa提升到170.9 MPa。通过高温熔体库埃特粘度仪表征合金熔体流变行为,发现添加0.5wt%Fe元素在Al-5wt%Ni合金中会导致该液态熔体粘度上升,但645℃时其剪切稀薄特性更强。Al-Ni hypoeutectic/eutectic alloys has both high strength,toughness and high thermal conductivity.The eute-ctic composition point of Ni in Al is higher than that of the other common transition group elements.Its castings have considerable application potential in the field of thermal management materials.The effects of adding a small amount of Fe on the microstructure,thermal conductivity/mechanical properties and rheological behavior of Al-5wt%Ni alloys were explored.The results show that the addition of 0.1wt%Fe in Al-5wt%Ni could result in significant refinement ofα-Al grains,(α-Al+Al3Ni)eutectic structure spheroidization and the second phase distribution is more uniform.When the Fe element is added at 0.1wt%,the thermal conductivity and mechanical properties of Al-5wt%Ni alloy improve simultaneously,the thermal conductivity increases from 211.4 W/(m·K)to 218.8 W/(m·K),the tensile strength increases from 132.5 MPa to 170.9 MPa.The rheological behavior of the alloy melt is characterized by the high-temperature melt couette viscometer,and it is found that the addition of 0.5wt%Fe element in the Al-5wt%Ni alloy cause the viscosity of the liquid melt to increase,but the shear thinning effect of the melt is more prominent at 645℃.

关 键 词：Al-5Ni合金 Fe元素 微观组织 导热系数 流变行为 

分 类 号：TG146.21[一般工业技术—材料科学与工程]