Sc含量对Al-10Zn-2.5Mg-1.6Cu-0.15Zr铝合金板材组织与力学性能的影响  

Effect of Sc content on microstructure and mechanical properties of Al-10Zn-2.5Mg-1.6Cu-0.15Zr aluminum alloy sheet

作　　者：田妮 韩世达[1,2] 周轶然 王光东 赵刚 秦高梧[1,2,3] TIAN Ni;HAN Shi-da;ZHOU Yi-ran;WANG Guang-dong;ZHAO Gang;QIN Gao-wu(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China;Research Center for Metallic Wires,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819 [2]东北大学材料各向异性与织构教育部重点实验室,沈阳110819 [3]东北大学金属型线材研究中心,沈阳110819

出　　处：《中国有色金属学报》2021年第12期3489-3498,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51871043);中央高校基本科研业务费项目(N180212010);辽宁省自然科学基金资助项目(2019-MS-113)。

摘　　要：利用金相显微镜(OM)、透射电子显微镜(TEM)结合万能材料试验机研究Sc含量(质量分数)从0.034%增大至0.215%时,Sc含量对T6态Al-10Zn-2.5Mg-1.6Cu-0.15Zr铝合金板材中过剩结晶相、弥散相、析出相、晶粒及力学性能的影响。结果表明:Sc含量从0.034%增加至0.215%,T相和Al_(7)Cu_(2)Fe相过剩结晶相粒子组态无明显变化;纳米级Al_(3)(Sc,Zr)弥散相粒子的尺寸不变但数量呈现出先增多后减少的趋势;析出相粒子尺寸先细化后粗化,数量先增多后减少。当Sc含量为0.189%时,合金板材中出现3~5μm的初生Al_(3)(Sc,Zr)粒子,其数量随Sc含量增加而增多。T6态Al-10Zn-2.5Mg-1.6Cu-0.15Zr-(0.034-0.139)Sc合金板材的晶粒呈纤维状,且随Sc含量增加,纤维状晶粒逐渐细化、长度逐渐缩短;当Sc含量为0.189%时,合金板材发生明显再结晶,其晶粒均为细小类球状等轴晶;当Sc含量从0.034%增加至0.215%,T6态合金板材的强度和伸长率均随Sc含量增加呈现出先升高后降低的趋势;当Sc含量为0.139%时,合金板材的性能最佳,其抗拉强度、屈服强度和伸长率分别为701 MPa、665 MPa和8.0%。The effects of Sc content from 0.034% up to 0.215% on the constituent,dispersoid,precipitate,grain and mechanical properties of Al-10Zn-2.5Mg-1.6Cu-0.15Zr aluminum alloy sheet in T6 temper were investigated by OM,TEM and universal material testing machine.The results show that,with the increase of Sc content from 0.034% to 0.215%,there is no obvious change with the size and quantity of micron T phase and Al_(7)Cu_(2)Fe in Al-10Zn-2.5Mg-1.6Cu-0.15Zr alloy sheet under T6 temper,the size and number of nanoscale precipitate is firstly refined and increase and then coarsened and decrease,whereas the number of the nanoscale Al_(3)(Sc,Zr)dispersoid increases with its size unchanging.When Sc content is 0.189%,there is primary Al_(3)(Sc,Zr)with the size of 3-5μm in the alloy sheets,and its number increases but the size has no obvious change with the increase of Sc content up to 0.215%.The grains of Al-10Zn-2.5Mg-1.6Cu-0.15Zr-(0.034-0.139)Sc alloy sheets in T6 temper are fibrous,and the fibrous grain gets thinner and shorter with the increase of Sc.When the Sc content is more than 0.189%,the grains of Al-10Zn-2.5Mg-1.6Cu-0.15Zr-(0.189-0.215)Sc alloy sheets in T6 temper are fine equiaxed which means that the recrystallization behavior of alloy sheet is promoted.When Sc content increases from 0.034% to 0.215%,the strength and elongation of alloy sheets in T6 temper firstly increase and then decrease.The alloy sheet in T6 temper with 0.139% Sc has the optimal performance with the tensile strength,yield strength and elongation of 701 MPa,665 MPa and 8.0%,respectively.

关 键 词：ScZr复合合金化 高Zn超高强铝合金板材 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]