Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 806, Issue -, Pages 909-916Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.07.107
Keywords
Metals and alloys; Microstructure; Scanning electron microscopy; Transmission electron microscopy; X-ray diffraction
Categories
Funding
- National Natural Science Foundation of China [51474101, 51271076, 51474195]
- Large-scale Instrument Sharing Platform of Hunan University
- Aluminum Alloy Laboratory of Beijing Institute of Aeronautical Materials
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The varied mechanisms of yttrium (Y) modifying a hypoeutectic Al-Si alloy under conditions of different cooling rates were investigated using solidification curves, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), transmission electron microscopy (TEM) equipped with energy dispersion X-ray detector (EDX) and high resolution transmission electron microscope (HRTEM). The results show that Y could modify the eutectic silicon of a hypoeutectic Al-Si alloy (A357), but the modification mechanism was different at variable cooling rates. At a low cooling rate, Y modified the eutectic silicon by introducing additional nucleation cores during the nucleation process. At a high cooling rate, Y modified the eutectic silicon by promoting the twin formation during its growth process. (C) 2019 Elsevier B.V. All rights reserved.
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