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在不同的冷却速率下制备Al-1%Sc-1%Zr中间合金。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和差示扫描量热仪(DSC)对中间合金初生粒子形貌和热力学性质进行研究。结果表明:初生粒子在低冷却速率时,是由一些立方、尖立方或十字花状的小粒子粘结组成的枝晶状颗粒。但是,初生粒子在中等的冷却速率时呈现分散的十字花状,在高冷却速率时呈现分散的立方状。不同冷却速率下十字花状和立方状单个粒子以及枝状晶中粘附粒子呈现Al3Sc/Al3Zr核-壳结构。通过数学模型对该结构的形成机制进行研究。
Al-1% Sc-1% Zr master alloy was prepared at different cooling rates. The morphology and thermodynamic properties of the primary particles of the master alloy were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results show that the primary particles are dendritic particles composed of small particles of cubic, pointed cube or cross-shaped flower at low cooling rate. However, the primary particles exhibit a discrete cruciform pattern at a moderate cooling rate and a discrete cubic pattern at high cooling rates. The Al3Sc / Al3Zr core-shell structure was observed in the cruciform and cubic single particles and the dendrite-attached particles at different cooling rates. Through the mathematical model of the structure of the mechanism of research.