【摘要】 利用超音速气体雾化法制备快速凝固高硅铝合金粉末 ,并对合金粉末组成、显微组织特征、显微硬度及时效处理对它们的影响进行系统研究。结果表明利用超音速气体雾化法所制备的高硅铝合金粉末组织主要由基体上弥散分布的细小颗粒相Si和针状相Al9FeSi3 组成。在X 射线衍射曲线上基体相及Si相衍射峰有一定程度宽化 ;合金粉末经时效处理后组织及相组成基本不发生变化 ,但基体及Si相衍射峰宽化程度有所减弱 ,时效初期合金粉末显微硬度有一定程度降低 ,随后延长时效时间则保持不变更多还原

【Abstract】 Rapidly solidified high silicon aluminum alloy powders were prepared by ultrasonic gas ato mization process. Phase constituent, microstructure characteristics, micro-hard ness of the alloy and influence of ageing treatment were studied systematically . The results showed that the microstructure of high silicon aluminu m alloy powders prepared by ultrasonic gas atomization process mainly consists o f fine particle Si phase distributed dispersedly in matrix and needle-like Al 9FeSi 3 phase. The diffraction peaks of the matrix and Si phase were broaden in a certain extent in the XRD diagram. The microstructure and phase constituent o f the alloy powder by ageing treatment are almost unchanged but the diffraction peak width is narrowed slightly. The micro-hardness of the alloy powder decreas ed somewhat in the initial stage of the ageing following unchanged with the pro longing of the ageing time.更多还原