摘要
针对镁/铝层合板轧制过程中存在结合强度低、翘曲和边裂严重等技术难题,研究了基于点阵强变形轧制(Lattice severe deformation rolling,LSDR)原理以波纹辊对其一道次轧制成形。借助有限元数值计算分析了金属板材在复杂辊缝下的塑性流动规律和成形特点,并进行了轧制实验。结果表明:LSDR原理轧制镁/铝层合板时,波纹辊能够对难变形的镁合金及结合界面处产生点阵状分布的局部强非均匀变形作用,增强镁合金沿轧向(Rolling direction,RD)和横向(Transverse direction,TD)的塑性流动,并在结合界面处产生更大的剪切应力。相较于传统平轧,LSDR原理轧制所得镁/铝层合板的抗拉强度、拉剪强度和抗弯强度均有提高,其中拉剪强度最大增幅达77%;并且结合界面均匀可靠,产生约5μm厚的扩散层。研究内容为高质量镁/铝层合板的制备提供了有价值的参考。
Aiming at the technical problems such as low bonding strength,serious warpage and edge cracks in the rolling process of Mg/Al laminated composite,one rolling pass forming with a corrugated roll was studied based on lattice severe deformation rolling(LSDR)principle.The plastic flow law and forming characteristics of the metal plates at complex roll gap were analyzed by finite element numerical calculation,and the rolling experiment was performed.The results show that a series of local strong non-uniform deformation effects distributed as a lattice structure can be applied on the magnesium alloy plate and at the bonding interface by the corrugated roll,and the plastic flow along both rolling direction(RD)and transverse direction(TD)has been strengthened when the LSDR principle is used.Additionally,larger shearing stress can be produced at the bonding interface.Compared with the traditional rolling using flat rolls,the tensile strength,tensile-shear strength and bending strength of the laminated composite prepared on the LSDR principle are significantly improved,and the maximum increase rate of tensileshear strength obtained reaches 77%.Meanwhile,the bonding interface is uniform and reliable.The diffusion layer is about 5μm thick.This study provides a valuable reference for the preparation of high-quality Mg/Al laminated composite.
作者
冯光
郜豪杰
申依伦
张恒
FENG Guang;GAO Haojie;SHEN Yilun;ZHANG Heng(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Ministry of Education,Taiyuan 030024,China;TYUT-UOW Joint Research Centre of Advanced Forming and Manufacturing Technology,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第8期4802-4812,共11页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(52074190)
山西省留学回国人员科技活动择优资助重点项目(20220007)
山西省科技重大专项(20181101008)。
关键词
点阵强变形轧制
波纹辊
镁/铝层合板
界面
结合性能
lattice severe deformation rolling
corrugated roll
Mg
Al laminated composite
interface
bonding performance
