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研究了搅拌摩擦加工(FSP)技术对高硅铝合金Al Si30的抗拉强度、伸长率的影响,探讨了其断裂机理。结果表明,随着摩擦搅拌道次的增加,Al Si30的强度和塑性都显著提高,材料的断裂模式从脆性断裂转变为韧性断裂。当摩擦搅拌道次较少时,粗大硅相多,且不够圆整,裂纹首先发源于粗大硅颗粒内部,并引发基体断裂,硅相的断裂面与周围基体的断裂面平齐;当摩擦搅拌道次较多时,粗大硅相少,而且圆整,裂纹基本上发源于粗大硅颗粒/铝基体界面。
The effect of friction stir processing (FSP) on the tensile strength and elongation of AlSi30 high-silicon aluminum alloy was studied and its fracture mechanism was discussed. The results show that the strength and ductility of Al Si30 increase significantly with the increase of friction stir passes, and the fracture mode changes from brittle fracture to ductile fracture. When the friction stirrer is less, the coarse silicon phase is more and less round, the cracks first originate in the coarse silicon particles and lead to the rupture of the matrix, the rupture plane of the silicon phase is flush with the rupture plane of the surrounding matrix. When friction stir When more passes, the coarse silicon less, and rounded, the cracks originated in coarse silicon particles / aluminum matrix interface.