低钪含量Al-Zn-Mg-Cu-Zr铝合金的组织性能研究  

Microstructure and Properties of Al-Zn-Mg-Cu-Zr Alloy with Low Scandium Content

作　　者：朱必武 肖罡[3] 刘筱 叶帆 张维 崔晓丽 詹海鸿 刘文辉 Zhu Biwu;Xiao Gang;Liu Xiao;Ye Fan;Zhang Wei;Cui Xiaoli;Zhan Haihong;Liu Wenhui(School of Marine Equipment and Mechanical Engineering,Jimei University,Xiamen 361021,China;Hunan Engineering Research Center of Forming Technology and Damage Resistance Evaluation for High Efficiency Light Alloy Components,Hunan University of Science and Technology,Xiangtan 411201,China;Jiangxi Copper Technology Research Institute Co.,Ltd,Nanchang 330096,China;School of Materials Science and Engineering,Guangdong Ocean University,Yangjiang 529500,China;Light Alloy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]集美大学海洋装备与机械工程学院,福建厦门361021 [2]湖南科技大学高功效轻合金构件成形技术及耐损伤性能评价湖南省工程研究中心,湖南湘潭411201 [3]江西铜业技术研究院有限公司,江西南昌330096 [4]广东海洋大学材料科学与工程学院,广东阳江529500 [5]中南大学轻合金研究院,湖南长沙410083

出　　处：《稀有金属材料与工程》2025年第3期722-729,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(52475356,52471132,52471055,52475357,U21A20130);江西省自然科学基金杰出青年基金(20224ACB218002);福建省自然科学基金杰出青年基金(2024J010031)。

摘　　要：利用OM、SEM、TEM和万能材料试验机研究了低钪含量(0.02%、0.07%、0.12%,质量分数)Al-Zn-Mg-Cu-Zr铝合金的析出行为与力学性能之间的关系。结果表明:随着钪含量的增加,合金中铸态组织逐渐细化,晶界处粗大第二相增加,削弱了细晶强化效果;轧制+T6态下的Al_(3)(Sc,Zr)相抑制主强化相η'相的析出,随着合金中钪含量的增加抑制效果更为明显,从而弱化析出强化效果;合金晶粒的细化有利于拉伸过程形成更多更细小的韧窝,提升板材延伸率;钪含量为0.02%Sc的合金在经过轧制+T6热处理后综合力学性能优良,其抗拉强度为683 MPa、延伸率为21%。The relationship between the mechanical properties and precipitation behavior of Al-Zn-Mg-Cu-Zr aluminum alloys with low Sc content(0.02wt%,0.07wt%,0.12wt%)was investigated by OM,SEM,TEM,and universal material testing machine.With the increase in Sc content,microstructure of as-cast alloy is gradually refined,and the coarse secondary phase at the grain boundary increases,thus weakening the effect of fine grain strengthening.In the alloy at rolling+T6 state,the Al_(3)(Sc,Zr)phase inhibits the precipitation of the main strengthening phaseη',and the inhibition effect becomes more obvious with the increase in Sc content,thus weakening the precipitation strengthening effect.The grain refinement is conducive to the formation of more and finer dimples during the tensile deformation,thus improving the ductility of the alloy.The low Sc content alloy(0.02wt%)shows the excellent mechanical properties after rolling and T6 heat treatment,whose tensile strength and elongation are 683 MPa and 21%,respectively.

关 键 词：钪 铝合金 轧制 力学性能 Al_(3)(Sc Zr)相 

分 类 号：TG135.1[一般工业技术—材料科学与工程] TG146.21[金属学及工艺—合金]