搅拌摩擦加工对压铸ADC10合金显微组织与力学性能的影响

Effect of Friction Stir Processing on Microstructure and Mechanical Properties of Die Casting ADC10 Alloy

压铸ADC10铝合金中存在多种第二相颗粒,特别是含铁相第二相会导致其延展性大幅降低,从而影响了其结构应用。通过对ADC10合金铸态组织进行适当的改性,可以提高合金的力学性能。本文研究并分析了搅拌摩擦加工(FSP)对压铸ADC10合金显微组织及力学性能的影响:搅拌摩擦加工能有效地细化合金的铸态组织,分解粗大的Si颗粒,在α-Al基体中形成了均匀细小的等轴Si颗粒。此外,搅拌摩擦加工消除了作为裂纹源的孔隙等缺陷及破碎第二相颗粒,从而提高了合金的力学性能和延展性。

There are many kinds of second phase particles in die casting ADC10 aluminum alloy,especially the second phase containing iron,which greatly reduces its ductility,thus affecting its structural application.The mechanical properties of the ADC10 alloy can be improved by modifying the as-cast microstructure.In this paper,the effects of friction stir processing(FSP)on the microstructure and mechanical properties of the diecast ADC10 alloy were investigated and analyzed.The friction stir processing can effectively refine the ascast microstructure,decompose the coarse Si particles,and form uniform fine equiaxed Si particles in theα-Al matrix.In addition,the friction stir processing eliminates the defects such as pores as the crack source and the broken second phase particles,thus improving the mechanical properties and ductility of the alloy.