Yang Qingshan, Zhang Dan, Peng Peng, Wei Guobing, Zhang Jianyue, Jiang Bin, Pan Fusheng
School of Metallurgy and Material Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China.
Materials (Basel). 2023 Jul 26;16(15):5255. doi: 10.3390/ma16155255.
Magnesium (Mg) alloy is a widely used lightweight metal structural material due to its high specific strength and stiffness, excellent damping performance, and recyclability. Wrought Mg alloys are particularly favored in fields such as aerospace, transportation, and biomedical stents. However, most wrought Mg alloys with a hexagonal close-packed (HCP) crystal structure lack sufficient independent slip systems to meet the von Mises criterion for uniform plastic deformation at room temperature. This can result in the formation of a strong basal texture during plastic deformation and poor room temperature plastic formability. Enhancing the room temperature forming performance is therefore a crucial challenge that needs to be addressed in order to expand the application of Mg alloy sheets. Our research group has comprehensively summarized significant work and the latest research progress in improving the room temperature forming of Mg alloy sheets via extrusion technology in recent years. Specifically, we have developed a new type of asymmetric extrusion technology that combines material structure evolution, mechanical properties, and forming behavior analysis. We have elucidated the extrusion process characteristics, texture control mechanism, and forming properties of Mg alloy sheets through plastic deformation mechanisms, mold design, and finite element numerical simulation. The findings of our study present an innovative extrusion technology for the fabrication of highly formable Mg alloy sheets, which can be utilized in various applications.
镁（Mg）合金因其高比强度和刚度、优异的阻尼性能以及可回收性，是一种广泛应用的轻质金属结构材料。变形镁合金在航空航天、交通运输和生物医学支架等领域尤其受到青睐。然而，大多数具有六方密堆积（HCP）晶体结构的变形镁合金缺乏足够的独立滑移系，无法满足室温下均匀塑性变形的冯·米塞斯准则。这可能导致在塑性变形过程中形成强烈的基面织构以及室温下较差的塑性成形性。因此，提高室温成形性能是扩大镁合金板材应用所需解决的关键挑战。近年来，我们的研究团队全面总结了通过挤压技术改善镁合金板材室温成形方面的重要工作和最新研究进展。具体而言，我们开发了一种结合材料结构演变、力学性能和成形行为分析的新型非对称挤压技术。通过塑性变形机制、模具设计和有限元数值模拟，我们阐明了镁合金板材的挤压工艺特点、织构控制机制和成形性能。我们的研究结果提出了一种用于制造高成形性镁合金板材的创新挤压技术，可用于各种应用。
