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对汽车发动机缸体用Al-Si-Fe合金进行了半固态触变挤压成形和T1、T6热处理,研究了不同制备工艺下Al-Si-Fe合金的显微组织、物相组成、力学性能和耐磨性能。结果表明,经过半固态挤压触变成形可以破碎合金中的初生硅和α-Al基体,晶粒组织得到细化;经过触变成形得到的Al-Si-Fe合金的强度和塑性都较铸态合金有明显提高,且经过T6热处理后的强度有所增加,而塑性略有降低;铸态、T1、T6和触变成形态Al-Si-Fe合金的耐磨性能要明显高于A390合金;铸态Al-Si-Fe合金的磨损机制为粘着磨损和磨粒磨损,而触变成形态和T6热处理态Al-Si-Fe合金的磨损机制主要为磨粒磨损。
Al-Si-Fe alloy for automobile engine block was subjected to semi-solid thixoforming and T1, T6 heat treatment to study the microstructure, phase composition and mechanical properties of Al-Si-Fe alloy under different preparation processes And wear resistance. The results show that the strength and ductility of the Al-Si-Fe alloy after thixoforming are all reduced by the thixoforming of semi-solid extruded alloy, which can rupture the primary Si and α-Al matrix in the alloy. Compared with the as-cast alloy, the wear resistance of the as-cast Al-Si-Fe alloy was significantly higher than that of the as-cast alloy, and the strength increased slightly after T6 heat treatment, while the plasticity slightly decreased. A390 alloy. The wear mechanism of as-cast Al-Si-Fe alloy is adhesive wear and abrasive wear. The wear mechanism of the Al-Si-Fe alloy in the thixotropic formation and T6 heat treatment is abrasive wear.