Determining the Critical Fracture Stress of Al Dendrites near the Melting Point via Synchrotron X-ray Imaging

Qin, Ling; Zhang, Zhiguo; Guo, Baisong; Li, Wei; Mi, Jiawei

Abstract

Dendrites are the most common microstructural features in the cast metals, significantly affecting the structure integrity and mechanical properties of the castings. In this study, the in situ synchrotron X-ray radiographic and tomographic imaging techniques were combined to evaluate the critical fracture stress of the growing dendrite tip during the solidification of an Al-15 wt% Cu alloy under an external electromagnetic force. Two dendritic 3D models have been proposed to simulate the dendrite 3D morphologic characteristics and thus revealed that the critical fracture stresses of the Al dendrites at temperatures close to its melting point were in the range of 0.5 kPa–0.05 MPa. The present results demonstrate the feasibility of measuring the high-temperature mechanical properties of the metallic dendrites.

Citation

Qin, L., Zhang, Z., Guo, B., Li, W., & Mi, J. (2023). Determining the Critical Fracture Stress of Al Dendrites near the Melting Point via Synchrotron X-ray Imaging. Acta Metallurgica Sinica (English Letters), 36(5), 857-864. https://doi.org/10.1007/s40195-023-01531-w

• Journal Article Type: Article
• Acceptance Date: Nov 4, 2022
• Online Publication Date: Feb 11, 2023
• Publication Date: May 1, 2023
• Deposit Date: Jun 26, 2024
• Journal: Acta Metallurgica Sinica (English Letters)
• Print ISSN: 1006-7191
• Electronic ISSN: 2194-1289
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 36
• Issue: 5
• Pages: 857-864
• DOI: https://doi.org/10.1007/s40195-023-01531-w
• Keywords: Synchrotron X-ray radiography; Tomography; Al dendrite; Fragmentation; Critical fracture stress
• Public URL: https://hull-repository.worktribe.com/output/4337976