title: Nucleation mechanism of nano-sized NaZn13-type and α-(Fe,Si) phases in La-Fe-Si alloys during rapid solidification.
abstract: The nucleation mechanism involving rapid solidification of undercooled La-Fe-Si melts has been studied experimentally and theoretically. The classical nucleation theory-based simulations show a competitive nucleation process between the α-(Fe,Si) phase (size approximately 10 to 30 nm) and the cubic NaZn13-type phase (hereinafter 1:13 phase, size approximately 200 to 400 nm) during rapid solidification, and that the undercooled temperature change ∆T plays an important factor in this process. The simulated results about the nucleation rates of the α-(Fe,Si) and 1:13 phases in La-Fe-Si ribbons fabricated by a melt-spinner using a copper wheel with a surface speed of 35 m/s agree well with the XRD, SEM, and TEM studies of the phase structure and microstructure of the ribbons. Our study paves the way for designing novel La-Fe-Si materials for a wide range of technological applications.
authors: Laboratory for Microstructures, Shanghai University, Shanghai, 200444 China ; School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 China.
authors: Xue-Ling
authors: XL
authors: Hou
authors: Laboratory for Microstructures, Shanghai University, Shanghai, 200444 China ; School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 China.
authors: Yun
authors: Y
authors: Xue
authors: Laboratory for Microstructures, Shanghai University, Shanghai, 200444 China ; School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 China.
authors: Chun-Yu
authors: CY
authors: Liu
authors: Laboratory for Microstructures, Shanghai University, Shanghai, 200444 China ; School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 China.
authors: Hui
authors: H
authors: Xu
authors: Shanghai University of Engineering Science, Shanghai, 201620 China.
authors: Ning
authors: N
authors: Han
authors: Shanghai University of Engineering Science, Shanghai, 201620 China.
authors: Chun-Wei
authors: CW
authors: Ma
authors: Department of Physics, University of South Florida, Tampa, FL 33620 USA.
authors: Manh-Huong
authors: MH
authors: Phan
keywords: La(Fe,Si)13 ribbons; Nanostructure; Nucleation mechanism; Rapid solidification