喷射沉积8009/SiC_P铝合金的陶粒轧制成形性能研究

针对喷射沉积铝合金板坯含有一定量的孔隙、直接轧制时易出现板坯表面横裂及边裂的问题,探讨了一种新型的准等静压轧制工艺—陶粒轧制。主要研究在陶粒轧制工艺过程中传压介质对喷射沉积8009/SiCP铝合金板坯轧制成形性能的影响。结果表明,在陶粒轧制过程中合理设计、选取及控制传压介质,避免了板坯轧制变形过程中裂纹的形成,有效地提高了喷射沉积铝合金板坯的轧制成形性能。

Phase evolution in AlSi20/8009 aluminum alloy during high temperature heating near melting point and cooling processes

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 Al4.5 Fe Si phase and a nano-sized V-rich phase during holding the alloy at 580-600℃. With increasing holding temperature to 620-640℃, Al4.5 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 ℃) furnace cooling to 570 ℃ or lower, Si and Al12(Fe,V)3 Si phases evolved into strip-like Al4.5 Fe Si and the V-rich phases, which is a novel formation route for Al4.5 Fe Si phase different from Al-Fe-Si ternary system.

喷射沉积铝合金板坯的陶粒轧制工艺研究

针对喷射沉积铝合金板坯含有一定量的孔隙、直接轧制时易出现板坯表面横裂及边裂的问题,提出了一种新型的陶粒轧制工艺。研究了喷射沉积5A06,8009/S iCP铝合金板坯在陶粒轧制工艺中的轧制性能。实验结果表明,采用陶粒轧制工艺,避免了板坯轧制变形过程中裂纹的形成,有效地提高了喷射沉积铝合金板坯的轧制成形性能。