On the Effect of Interphase Boundary Energy Anisotropy on Morphologies: A New Type of Eutectic Grain Observed in a Three-Phase Eutectic System
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
Eutectic microstructures are dramatically affected by the anisotropy in interphase boundary energy. Depending on this anisotropy function, different eutectic grains may grow simultaneously at the same experimental conditions. In all reported quasi-isotropic and anisotropic two-phase and three-phase eutectic grains in thin samples, lamellar morphology is observed and the microstructure is essentially two dimensional (2D), since the interphase boundaries are perpendicular to the sample walls. Using the ?(In)–In2Bi–?(Sn) system and real-time solidification experiments in thin samples, we introduce a unique and new type of anisotropic three-phase eutectic grain, entitled here as “Laminated Matrix with Rods (LMR).” In this grain, due to the anisotropy in In2Bi/?(Sn) interphase boundary, the evolving phases, and hence, the microstructures observed through the two glass plates of the thin sample are completely different, despite the strong confinement effect. During rotating directional solidification (RDS) experiments, the morphology or the aspect ratio of all phases changes periodically and drastically. Specifically, In2Bi, ?(In), and ?(Sn) phases evolve from all being lamellar perpendicular to the sample walls to the matrix, elongated/trapezoidal rods, and a lamella parallel to the sample walls, respectively. Our experimental results show that these morphological transitions are due to change in the interphase boundary orientation with respect to the growth direction. Graphical abstract: (Figure presented.) © The Author(s) 2024.
Açıklama
Anahtar Kelimeler
Aspect Ratio, Binary Alloys, Bismuth Alloys, Eutectics, Microstructure, Morphology, Solidification, Tin Alloys, Boundary Energies, Energy Anisotropy, Eutectic Grains, Eutectic Microstructure, Eutectic System, Experimental Conditions, Interphase Boundaries, Matrix, Quasi-İsotropic, Three-Phase Eutectics, Anisotropy
Kaynak
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
WoS Q Değeri
Scopus Q Değeri
Q1
