有色金属科学与工程2025，Vol.16Issue(1)：75-84,10.DOI:10.13264/j.cnki.ysjskx.2025.01.009
含Sc超高强度铝合金成分优化及组织性能研究
Study on the composition optimization and microstructure properties of super high-strength aluminum alloy with scandium
摘要
Abstract
With Al-8.67Zn-2.5Mg-2.5Cu aluminum alloy as the research object,using Jmatpro software to simulate and calculate the alloy phase diagram and properties,the optimal amount of Sc element added and its heat treatment process was determined,and alloy ingots were prepared through electric arc furnace.The influence of Sc element and solid solution aging process on the microstructure evolution of the sample was studied,and the strengthening mechanism of the alloy was explored.The results indicate that the tensile strength and hardness of the alloy were maximized when 0.25%Sc element was added,and the polarization of Al 3 Sc can be avoided.The numerically simulated hardness and tensile strength of the Al-8.67Zn-2.5Mg-2.5Cu-0.25Sc alloy are 139.13 HV and 424.12 MPa,respectively.The optimal heat treatment process for the alloy,including homogenization,solid solution,and aging,is 475℃/24 h+482℃+25℃/16 h.By cooling the samples at a cooling rate greater than 174.23℃/s and transferring them to the solid solution for less than 0.42 seconds,second-phase precipitation can be inhibited,resulting in an oversaturated solid solution.After homogenization heat treatment of the as-cast aluminum alloy,the hardness,tensile strength,and elongation are 139.86 HV,432.1 MPa and 10.31%,respectively.After solid solution and aging,the hardness,tensile strength,and elongation of the alloy are increased by 35.42 HV,146.6 MPa and 2.4%,respectively.关键词
含钪铝合金/热处理/JMatPro软件/金相组织/力学性能Key words
scandium-containing aluminum alloy/heat treatment/JMatPro software/metallographic structure/mechanical properties分类
金属材料引用本文复制引用
宫子琪,郑理银..含Sc超高强度铝合金成分优化及组织性能研究[J].有色金属科学与工程,2025,16(1):75-84,10.基金项目
天津市教委科研计划资助项目(2019KJ139) （2019KJ139）
