对过共晶Al-Si-Fe合金进行了搅拌摩擦加工(FSP),研究了不同FSP转速和道次对过共晶铝硅合金强度和组织的影响.其中,选择搅拌转速分别为750 r/min、1050 r/min和1500 r/min,搅拌道次分别为1道、2道、3道.结果表明,合金经过FSP加工后,硅、含铁相等硬质第二相颗粒强烈细化,但随着搅拌转速的提高,硬质相颗粒细化效果变差,第二相颗粒平均粒径由11.7μm变为15.5 μm.随着搅拌道次的增加,细化效果越发显著,第二相颗粒的平均粒径由11.7μm变为8.9μm.FSP加工后材料抗拉强度和延伸率较铸态大幅度提高.当搅拌转速为750 r/min、道次为3时,材料的拉伸强度和延伸率分别由铸态的48 MPa、0.43％提高到150MPa、2.97％.因此,经FSP后过共晶铝硅合金组织和力学性能得到极大改善.
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