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IMDEA Materials Institute X-ray In-Situ Observation Reveals Cracking Mechanism of 3D-Printed Metal Micropores
2026-05-05
Researchers from IMDEA Materials Institute and Universidad Carlos III de Madrid, in collaboration with peers from France and Japan, published a study in the Journal of the Mechanics and Physics of Solids, systematically examining the failure behavior of two laser powder bed fusion (LPBF) alloys—AlSi10Mg and Ti6Al4V—under extreme dynamic loading. Using ultrafast X-ray phase-contrast imaging (nanosecond resolution) at the European Synchrotron Radiation Facility, the team captured, for the first time, the full process: shockwaves causing internal pores to first collapse, then reopen and expand, and ultimately coalesce into internal spallation cracks. Although the fracture morphologies of the two alloys differed, the pore evolution mechanism was identical. This research provides a micro-mechanistic framework for evaluating the impact resistance of additively manufactured metals in aerospace, defense, and other fields.
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IMDEA材料研究所X射线原位观测试验，揭示3D打印金属微孔致裂机制
西班牙IMDEA材料研究所与马德里卡洛斯三世大学联合法国、日本同行，在《固体力学与物理杂志》发表研究，系统观察了AlSi10Mg和Ti6Al4V两种激光粉末床熔融合金在极端动态加载下的失效行为。借助欧洲同步辐射光源的超快X射线相衬成像（纳秒级分辨率），团队首次记录了冲击波使打印件内部孔隙先坍塌、后重新张开并扩展，最终汇聚形成内部层裂裂纹的全过程。两种合金断口形态虽有差异，但孔隙演化机制相同。该研究为增材制造金属在航空、国防等领域的抗冲击评估提供了微观机理层面的解释框架。