【摘要】 将AlSi20/8009铝合金加热至熔点附近温度后进行冷却,利用差热扫描量热仪、扫描电子显微镜、能量分散谱仪和X射线衍射仪研究外加Si对Al₁₂（Fe,V）₃Si弥散体相演变的影响。结果发现,当AlSi20/8009铝合金在580～600°C保温时,Al₁₂（Fe,V）₃Si和Si相演变成为针状Al_4.5Fe Si相和富V纳米相。提高保温温度至620～640°C,Al_4.5Fe Si相和纳米相逆向演变为Al₁₂（Fe,V）₃Si相和Si相,其中Al₁₂（Fe,V）₃Si相具有粗大六边形形貌。当AlSi20/8009铝合金在640°C保温后冷却至570°C或更低的温度时,Si相和粗大六边形Al₁₂（Fe,V）₃Si相演变成片状Al_4.5Fe Si相和富V纳米相,这是一种不同于Al-Fe-Si三元体系的Al_4.5FeSi相的新型形成路径。更多还原

【Abstract】 The AlSi20/8009 aluminum alloy was heated to high temperatures near the melting point and cooled to investigate the effect of external Si addition on the phase evolution of Al₁₂（Fe,V）₃ Si dispersion. Differential scanning calorimeter, scanning electron microscope, energy dispersive spectrometer and X-ray diffractometer were employed.The results showed that Al₁₂（Fe,V）₃ Si and Si phases evolved into a needle-like Al_4.5 Fe Si phase and a nano-sized V-rich phase during holding the alloy at 580-600 °C. With increasing holding temperature to 620-640 °C, Al_4.5 Fe Si and nano-sized V-rich phases evolved reversibly into Al₁₂（Fe,V）₃ Si and Si phases, of which Al₁₂（Fe,V）₃ Si occupied a coarse and hexagonal morphology. During the alloy（after holding at 640 °C） furnace cooling to 570 °C or lower, Si and Al₁₂（Fe,V）₃ Si phases evolved into strip-like Al_4.5 Fe Si and the V-rich phases, which is a novel formation route for Al_4.5 Fe Si phase different from Al-Fe-Si ternary system.更多还原