Hou Xue-Ling, Xue Yun, Liu Chun-Yu, Xu Hui, Han Ning, Ma Chun-Wei, Phan Manh-Huong
Laboratory for Microstructures, Shanghai University, Shanghai, 200444 China ; School of Materials Science and Engineering, Shanghai University, Shanghai, 200072 China.
Shanghai University of Engineering Science, Shanghai, 201620 China.
Nanoscale Res Lett. 2015 Mar 19;10:143. doi: 10.1186/s11671-015-0843-1. eCollection 2015.
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.
对过冷的La-Fe-Si熔体快速凝固的成核机制进行了实验和理论研究。基于经典成核理论的模拟表明，在快速凝固过程中，α-(Fe,Si)相（尺寸约为10至30纳米）和立方NaZn13型相（以下简称1:13相，尺寸约为200至400纳米）之间存在竞争成核过程，且过冷温度变化∆T在该过程中起重要作用。通过使用表面速度为35米/秒的铜轮的熔体纺丝法制备的La-Fe-Si薄带中α-(Fe,Si)相和1:13相的成核速率模拟结果，与薄带相结构和微观结构的XRD、SEM及TEM研究结果吻合良好。我们的研究为设计适用于广泛技术应用的新型La-Fe-Si材料铺平了道路。
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