热处理对原位(ZrB_(2)+TiB_(2))/Al-4.5Cu铝基复合材料组织和性能的影响  

Effect of heat treatment on microstructure and properties of in-situ(ZrB_(2)+TiB_(2))/Al-4.5Cu aluminum matrix composites

作　　者：赵任 张松利[1] 代旭中 ZHAO Ren;ZHANG Song-li;DAI Xu-zhong(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《材料热处理学报》2024年第12期31-38,共8页Transactions of Materials and Heat Treatment

摘　　要：采用Al-K_(2)TiF_(6)-K_(2)ZrF_(6)-KBF_4反应体系成功制备了(ZrB_(2)+TiB_(2))颗粒含量为3 mass%的(ZrB_(2)+TiB_(2))/Al-4.5Cu铝基复合材料,研究了热处理对复合材料微观组织和力学性能的影响,并分析了相关机理。结果表明:固溶处理(530℃×4 h)后,复合材料的基体晶粒平均尺寸由68.0μm增大至77.8μm,抗拉强度由铸态的210.4 MPa提高到246.7 MPa,增长了17.3%,伸长率由6.7%下降至4.0%,下降了40.0%。T6(530℃×4 h+180℃×8 h)处理后,复合材料中Al_(2)Cu相的尺寸从11.9μm减小到10.6μm,形貌由粗大条状转变成圆球状,颗粒多数仍分布在晶界处,少数分布在晶内,复合材料基体晶粒平均尺寸由68.0μm增大至81.1μm,晶粒形貌变为等轴晶,抗拉强度由铸态的210.4 MPa提高到270.1 MPa,提高了28.6%,伸长率由6.7%上升至8.9%,提高了32.8%。(ZrB_(2)+TiB_(2))/Al-4.5Cu aluminum matrix composites with(ZrB_(2)+TiB_(2))particle content of 3 mass%were successfully prepared using the Al-K2TiF_(6)-K2ZrF_(6)-KBF_(4)reaction system.The influence of heat treatment on microstructure and mechanical properties of the composites was studied,and the relevant mechanisms were analyzed.The results show that after solution treatment(530℃×4 h),the average grain size of the composites matrix increases from 68.0μm to 77.8μm,the tensile strength increases from 210.4 MPa of as-cast to 246.7 MPa,an increase of 17.3%,and the elongation decreases from 6.7%to 4.0%,a decrease of 40.0%.After T6(530℃×4 h+180℃×8 h)treatment,the size of Al_(2)Cu phase in the composites decreases from 11.9μm to 10.6μm,its morphology changes from coarse strip-like to spherical shape,most particles are still distributed at grain boundaries and a few distributed inside the grains,the average grain size of the composites matrix increases from 68.0μm to 81.1μm,the grain morphology changes to equiaxed grains,the tensile strength increases from 210.4 MPa to 270.1 MPa,an increase of 28.6%,and the elongation increases from 6.7%to 8.9%,an increase of 32.8%.

关 键 词：AL-4.5CU合金 原位(ZrB_(2)+TiB_(2))颗粒 热处理 强化机制 

分 类 号：TB333[一般工业技术—材料科学与工程]