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在传统的A356铝合金中加入Al-10Sr中间合金压铸成型制备新型的铝合金轮毂材料,通过光学显微镜和扫描电镜研究了铸态及T6热处理态A356铝合金的组织及其性能,分析了合金的断裂机制。结果表明:铸态A356合金中铁基化合物主要为β相(Al5FeSi);经T6工艺处理后,共晶Si粒子的边角更加圆润,Mg2Si完全固溶于铝基体中,合金组织得到改善;铸态及热处理态A356铝合金试样的拉伸断口均有大量韧窝存在,合金呈现较好的塑性;但T6热处理态A356铝合金的断口处韧窝与铸态相比更加均匀,合金的塑性提高;合金的断裂机制为韧窝+解理断裂的复合断裂机制。
In the traditional A356 aluminum alloy, adding Al-10Sr master alloy die-casting to prepare a new type of aluminum alloy wheel hub material, the microstructure and properties of as-cast and T6 heat treated A356 aluminum alloy were studied by optical microscope and scanning electron microscope, Fracture mechanism. The results show that the Fe-based compound in the as-cast A356 alloy is mainly β phase (Al5FeSi). After T6 treatment, the corner of the eutectic Si particles is more rounded and the Mg2Si is completely dissolved in the aluminum matrix. The microstructure of the alloy is improved. And the tensile fracture of the heat-treated A356 aluminum alloy specimen all have a large number of dimples, and the alloy shows good plasticity. However, the ductile fracture of the A356 aluminum alloy in the T6 heat treatment state is more uniform than the as-cast state and the plasticity of the alloy is improved ; Fracture mechanism of the alloy dimples + cleavage fracture composite fracture mechanism.