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University of Limerick Team Reshapes Metal Plasticity and Additive Manufacturing: Mechanical Anisotropy Is a Key Feature of 3D-Printed Metals
2026-05-06
The head of the Metal Plasticity and Additive Manufacturing research group at the University of Limerick, Ireland, has systematically characterized the mechanical properties of 3D-printed metals. The research focuses on two areas: the permanent deformation behavior of metals under repeated loading (metal plasticity), and how to manufacture and certify 3D-printed metal components. A key finding is that 3D-printed metals exhibit strong directionality—changing the build orientation can significantly alter their tensile and yield properties, an effect validated in steels and titanium alloys such as Ti-6Al-4V. 3D-printed metals are not 'just like' traditionally wrought metals; the layer-by-layer process creates a directional grain structure, leading to mechanical anisotropy. Post-processing such as hot isostatic pressing can homogenize the microstructure and seal pores, but the effectiveness depends on the initial print quality. The University of Limerick’s 3D printers are housed in an industrial environment, operated in collaboration with Croom Medical.
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利默里克大学团队重塑金属塑性与增材制造：力学各向异性是3D打印金属的关键特征
爱尔兰利默里克大学金属塑性与增材制造研究组负责人系统阐述了3D打印金属的力学性能特征。其研究聚焦两个方向：金属在重复载荷作用下的永久变形行为（金属塑性），以及如何制造并认证3D打印金属部件。关键发现是，3D打印金属具有极强的方向性——改变打印构建方向可显著改变其拉伸和屈服特性，这一效应在钢和钛合金（如Ti-6Al-4V）中均有验证。3D打印金属并非“就像”传统锻造金属一样，逐层叠加的工艺会产生方向性的晶粒组织，导致力学各向异性。后处理如热等静压可均匀化微观组织并封堵孔隙，但效果取决于原始打印质量。利默里克大学的3D打印机被安置在工业环境中，与Croom Medical合作运营。