目的 研究轧制压下量对Al/Mg/Al层状复合板组织及性能的影响规律,理清不同压下量下复合板界面、组织与力学性能的关系。方法 在轧制温度为400 ℃时,对Al/Mg/Al层状复合板进行一道次轧制,轧制压下量为40%、50%、60%,采用扫描电子显微镜（SEM）和电子背散射衍射（EBSD）技术,对界面及微观组织进行观察,利用万能试验机对复合板进行力学性能测试表征。结果 Al/Mg/Al层状复合板界面结合良好,无孔洞和金属间化合物生成。随着压下量的增加,Mg层晶粒组织更加均匀细小,晶粒尺寸为4.34 μm,Al侧晶粒更加细长,Mg层和Al层的再结晶粒占比增大。随着压下量的增加,Al/Mg/Al层状复合板的抗拉强度和屈服强度逐渐增大,延伸率则与之相反。60%压下量复合板的最大抗拉强度、屈服强度和延伸率分别为336 MPa、266 MPa、6.16%。随着压下量的增加,复合板抗弯强度逐渐降低,在最大抗弯强度下,50%和60%压下量复合板界面未发生分层,界面结合良好。随着压下量的增加,复合板的断裂模式由韧性断裂转变为韧性+解理的混合断裂模式。结论 一道次轧制Al/Mg/Al层状复合板无金属间化合物生成,界面结合良好。相比于40%压下量复合板,60%压下量复合板抗拉强度和屈服强度分别提高了20.8%、18.7%。
Abstract
The work aims to study the effect of rolling reduction on the microstructure evolution and properties of Al/Mg/Al laminated composite plates, and clarify the relationship between the interface, microstructure and mechanical properties of composite plates under different rolling reduction. The Al/Mg/Al laminated composite plate was rolled one pass at 400 ℃, and the rolling reduction was 40%, 50 % and 60%. The interface and microstructure were observed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The mechanical properties of the composite plate were tested and characterized by universal testing machine. The results showed that the interface of the Al/Mg/Al laminated composite plate was well bonded, and no holes and intermetallic compounds were formed. With the increase of reduction, the grain structure of the Mg layer was more uniform and fine, the grain size was 4.34 μm, the grain of the Al side was more slender, and the proportion of recrystallized grains of the Mg layer and the Al layer increased. With the increase of reduction, the tensile strength and yield strength of the Al/Mg/Al laminated composite plate gradually increased, and the elongation was opposite. The maximum tensile strength, yield strength and elongation of the composite plate with 60% reduction were 336 MPa, 266 MPa and 6.16%, respectively. With the increase of reduction, the bending strength of the composite plate decreased gradually. The interface of the composite plate with 50% and 60% reduction was not layered under the maximum bending strength, and the interface was well bonded. With the increase of reduction, the fracture mode of the composite plate changed from ductile fracture to ductile + cleavage mixed fracture. There is no intermetallic compound formed in the Al/Mg/Al laminated composite plate after one pass rolling, and the interface bonding is good. Compared with the composite plate of 40% reduction , the tensile strength and yield strength of the composite plate with 60% reduction are increased by 20.8% and 18.7%, respectively.
关键词
一道次热轧 /
Al/Mg/Al层状复合板 /
微观组织 /
力学性能
Key words
one pass hot rolling /
Al/Mg/Al laminated composite plate /
microstructure /
mechanical properties
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基金
广东省基础与应用基础研究重大专项（2020B0301030006）; 广东省科学院建设国内一流研究机构行动专项资金（2020GDASYL-20200101001,2023GDASONRC-0210,2023GDASONRC-0321）; 广东特支计划资助项目（2023TX07C512）; 广东省科技计划（2023A0505030002）
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