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Revealing dendritic pattern formation in Ni, Fe and Co alloys using synchrotron tomography

DOI: 10.1016/j.actamat.2017.02.022 DOI Help

Authors: M. A. Azeem (University of Manchester) , P. D. Lee (The University of Manchester; Research Complex at Harwell) , A. B. Phillion (McMaster University) , S. Karagadde (University of Manchester; Indian Institute of Technology Bombay) , P. Rockett (The University of Manchester) , R. C. Atwood (Diamond Light Source) , L. Courtois (The University of Manchester) , K. M. Rahman (Imperial College London) , D. Dye (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acta Materialia

State: Published (Approved)
Published: February 2017
Diamond Proposal Number(s): 11074

Abstract: The microstructural patterns formed during liquid to solid phase transformations control the properties of a wide range of materials. We developed a novel methodology that allows in situ quantification of the microstructures formed during solidification of high temperature advanced alloys. The patterns formed are captured in 4D (3D plus time) using a methodology which exploits three separate advances: a bespoke high temperature environment cell; the development of high X-ray contrast alloys; and a novel environmental encapsulation system. This methodology is demonstrated on Ni, Fe, and Co advanced alloy systems, revealing dendritic pattern formation. We present detailed quantification of microstructural pattern evolution in a novel high attenuation contrast Co-Hf alloy, including microstructural patterning and dendrite tip velocity. The images are quantified to provide 4D experimental data of growth and coarsening mechanisms in Co alloys, which are used for a range of applications from energy to aerospace.

Journal Keywords: Superalloys; Synchrotron tomography; Interfacial patterns; 4D imaging; Dendritic microstructures

Subject Areas: Materials, Physics


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