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Growth dynamics of faceted Al13Fe4 intermetallic revealed by high-speed synchrotron X-ray quantification

DOI: 10.1016/j.jallcom.2021.158604 DOI Help

Authors: Zihan Song (University of Birmingham) , Oxana V. Magdysyuk (Diamond Light Source) , Lei Tang (University of Birmingham) , Tay Sparks (University of Birmingham) , Biao Cai (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: April 2021
Diamond Proposal Number(s): 19216

Abstract: High-speed synchrotron tomography was used to investigate the nucleation and growth dynamics of Al13Fe4 intermetallic during solidification of an Al-5wt%Fe alloy, providing new insights into its formation process. The majority of Al13Fe4 intermetallics nucleated near the surface oxide of the specimen and a few nucleated at Al13Fe4 phase. Al13Fe4 crystals grew into a variety of shapes, including plate-like, hexagonal tabular, stair-like and V-shaped, which can be attributed to the crystal structure of this compound and its susceptibility to twinning. Hole-like defects filled with aluminium melt were observed within the intermetallics. Oriented particle attachment mechanism was proposed to explain the formation of the Al13Fe4 intermetallic, which needs further experiments and simulation to confirm.

Journal Keywords: Synchrotron tomography; 4D imaging; Al alloy; Faceted crystal

Subject Areas: Materials

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing