Edge defects significantly impact the forming quality of Mg/Al composite plates during the rolling process. This study aims to develop an effective rolling technique to suppress these defects. First, an enhanced Lemaitre damage model with a generalized stress state damage prediction mechanism was used to evaluate the key mechanical factors contributing to defect formation. Based on this evaluation, an embedded composite rolling technique was proposed. Subsequently, comparative validation was conducted at 350 °C with a 50 % reduction ratio. Results showed that the plates rolled using the embedded composite rolling technique had smooth surfaces and edges, with no macroscopic cracks observed. Numerical simulation indicated that, compared to conventional processes, the proposed technique reduced the maximum edge stress triaxiality of the plates from −0.02 to −1.56, significantly enhancing the triaxial compressive stress effect at the edges, which suppressed void nucleation and growth, leading to a 96 % reduction in damage values. Mechanical property evaluations demonstrated that, compared to the conventional rolling process, the proposed technique improved edge bonding strength and tensile strength by approximately 67.7 % and 118 %, respectively. Further microstructural characterization revealed that the proposed technique, influenced by the restriction of deformation along the transverse direction (TD), weakened the plastic flow in the TD and enhanced plastic flow along the rolling direction (RD), resulting in higher grain boundary density and stronger basal texture. This, in turn, improved the toughness and transverse homogeneity of the plates. In summary, the embedded composite rolling technique provides crucial technical guidance for the preparation of Mg-based composite plates.

中文翻译：

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Mg/Al复合板轧制边缘缺陷抑制研究：嵌入式轧制技术的发展


边缘缺陷会显著影响 Mg/Al 复合板在轧制过程中的成型质量。本研究旨在开发一种有效的轧制技术来抑制这些缺陷。首先，使用具有广义应力状态损伤预测机制的增强 Lemaitre 损伤模型来评估导致缺陷形成的关键力学因素。基于此评估，提出了一种嵌入式复合轧制技术。随后，在 350 °C 下以 50% 的还原率进行比较验证。结果表明，采用嵌入式复合轧制技术轧制的板材表面和边缘光滑，未观察到宏观裂纹。数值模拟表明，与传统工艺相比，所提出的技术将板的最大边缘应力三轴性从 -0.02 降低到 -1.56，显着增强了边缘的三轴压应力效应，从而抑制了空隙的成核和增长，导致损伤值降低了 96%。机械性能评估表明，与传统的轧制工艺相比，所提出的技术分别提高了约 67.7% 和 118% 的边缘粘合强度和 118%。进一步的微观结构表征表明，所提出的技术受沿横向 （TD） 变形限制的影响，削弱了 TD 中的塑性流动并增强了沿滚动方向 （RD） 的塑性流动，从而导致更高的晶界密度和更强的基底织构。这反过来又提高了板材的韧性和横向均匀性。 综上所述，嵌入式复合轧制技术为镁基复合板的制备提供了重要的技术指导。