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- Title
Microstructural Hardening Mechanisms and Electrical Property Manipulations of Substantially Undercooled Fe<sub>87</sub>Cu<sub>13</sub> Alloy.
- Authors
Wu, Yuhao; Zhu, Baorong; Xia, Zhenchao; Yi, Dawei; Su, Jingwen
- Abstract
The microstructural hardening mechanisms and electrical property manipulations of undercooled Fe87Cu13 alloy have been investigated by systematical characterizations of Vickers microhardness and electrical impedance for glass-fluxed samples. Liquid Fe87Cu13 alloy was highly undercooled up to 399 K (0.23 TL). In small undercooling regime below 244 K, peritectic solidification happened, and a rise in undercooling contributed to the enhancement of primary dendrite growth velocity and copper content in dendrites and the refinement of solidification microstructures as well as the increase of both microhardness and impedance. When the rising undercooling attained 244 K, metastable phase separation occurred, and a Cu-rich shell was formed accompanied by a sudden drop of copper content in primary dendrites, microhardness and impedance. With a further improvement in undercooling, growth velocity of primary dendrites gradually increased and approached 22.0 m/s at the maximum undercooling. Meanwhile, dendrites contained more copper elements owing to the remarkable solute trapping effect, and the microhardness and impedance showed an upward trend. Numerical simulations revealed that surface segregation mainly dominated the liquid phase separation process if the copper proportion in Fe–Cu alloy was very low. Theoretical analyses demonstrated that the microhardness was closely related to the grain size, solute content and solidification velocity of primary phase whereas the magnitude of impedance was strongly dependent on the number of grain boundaries, crystal defects and vacancies.
- Subjects
COPPER; CRYSTAL defects; DENDRITIC crystals; SURFACE segregation; PHASE separation; LIQUID alloys
- Publication
Metallurgical & Materials Transactions. Part B, 2023, Vol 54, Issue 6, p2895
- ISSN
1073-5615
- Publication type
Article
- DOI
10.1007/s11663-023-02896-0