热浸镀层Si含量对铝钢复合板界面结构与性能的影响  

Effects of Si content in hot-dip coating on interface structure and properties of aluminum-steel composite sheets

作　　者：张旭远 李元东[1,2,3] 周宏伟[2,3] 王晟 邱谨[1,2] 鞠涛[1,2] 刘光雨 ZHANG Xuyuan;LI Yuandong;ZHOU Hongwei;WANG Sheng;QIU Jin;JU Tao;LIU Guangyu(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou 730050,China;Key Laboratory of Nonferrous Metal Alloys and Processing,Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050 [3]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《中国有色金属学报》2025年第1期181-195,共15页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51064017);甘肃省高等学校基本科研项目(1201ZTC056)。

摘　　要：采用热浸镀Al-x Si(x=0%、0.5%、1.0%、1.5%、2.5%、5.0%、7.5%,(质量分数,下同))合金进行实验,结合相图分析和第一性原理计算,研究热浸镀层中Si元素对固/液铸轧6061/Q345复合板界面组织、相组成和力学性能的影响。结果表明:在热浸镀层中添加Si元素后,铝/钢界面处形成了新的Al-Fe-Si三元相,即Al_(3)FeSi_(2)相、Al_(9)Fe_(2)Si_(2)相和Al_(0.5)Fe_(3)Si_(0.5)相;而脆性相Al_(5)Fe_(2)相和Al_(3)Fe相的含量降低提高了复合板的抗变形能力和韧性。热浸镀纯Al时,复合板的拉伸强度为402.4 MPa,剪切强度为51.3 MPa;而热浸镀Al-1%Si时,复合板的拉伸强度和剪切强度分别达到极值438.5 MPa和120.8 MPa,分别提高8.9%和135.4%。进一步增加热浸镀液中Si含量至7.5%时,复合板的抗拉强度和剪切强度均下降,仅为395.7 MPa和78.6MPa。随着热浸镀液中Si含量的增加,抗拉强度和剪切强度均呈现出先增加后降低的趋势。The effects of silicon(Si)content in hot-dip Al-xSi coatings(x=0%,0.5%,1.0%,1.5%,2.5%,5.0%,7.5%by mass fraction,hereafter the same)on the microstructure,phase composition,and mechanical properties of solid/liquid cast-rolled 6061/Q345 composite sheets were investigated through hot-dip coating experiments,phase diagram analysis,and first-principles calculations.The results indicate that the addition of Si to the hot-dip coating promotes the formation of new ternary Al-Fe-Si phases at the aluminum/steel interface,specifically Al_(3)FeSi_(2),Al_(9)Fe_(2)Si_(2),and Al_(0.5)Fe_(3)Si_(0.5) phases.This leads to a reduction in the content of brittle phases such as Al_(5)Fe_(2) and Al_(3)Fe,thereby enhancing the deformation resistance and toughness of the composite sheet.Compared with pure Al-coated composites,which exhibits tensile and shear strengths of 402.4 MPa and 51.3 MPa,respectively,the introduction of 1%Si in the coating significantly increases these values to 438.5 MPa and 120.8 MPa,representing improvements of 8.9%and 135.4%,respectively.However,further increasing the Si content to 7.5%results in a decline in both tensile strength(to 395.7 MPa)and shear strength(to 78.6 MPa).Overall,the tensile and shear strengths exhibit a trend of initially increasing and then decreasing with the increase of Si content in the hot-dip coating solution.

关 键 词：复合板 固/液铸轧 Q345钢 6061铝 界面组织 力学性能 

分 类 号：TG335.81[金属学及工艺—金属压力加工]