【摘要】 采用新型铝合金液态模锻制备了Al-Cu合金轮毂,研究了其力学性能、成分分布、显微组织及断裂行为。研究结果表明：轮毂试样中存在多种元素的富集和分布现象,其中Cu偏析较为严重；Al-Cu合金轮毂的显微组织由铸造组织和少量变形组织组成；Al-Cu合金轮毂最佳热处理制度为（530±5）°C,4 h+（535±5）°C,24 h固溶后（155±5）°C,4 h时效；T6和T5-1热处理试样的断口形貌为扁平韧窝,塑性差；T4热处理后的断口形貌显示出完全的回复性；经T4热处理后Al-Cu合金轮毂具有最好的伸长率；Al-Cu合金轮毂试样断裂失效的主要原因是CuAl₂（θ）相的形成；试样的断裂机制为沿晶断裂。更多还原

【Abstract】 The Al-Cu wheel adopting the new Al alloy was prepared by the liquid-die forging, and the mechanical properties, composition distribution, microstructure and fracture behavior were investigated. The results showed that serious Cu segregation was found in the wheel specimen; the microstructure of the Al-Cu wheel was comprised of the casting microstructure and a small amount of the deformed microstructure; the best heat treatment and water quenching system were found to solution treated at（530±5） °C for 4 h followed by（535±5） °C for 24 h and aging treated at（155±5） °C for 4 h; the fracture morphologies of the samples heated under T6 and T5-1 heat treatment showed flat, tough nest,and poor plastic characteristics; the fracture morphologies of the samples heated under T4 heat treatment exhibited complete resilience, but no residual metallographic characteristic; the sample treated under T4 protocol had the best elongation; the fracture failure was mainly due to the formation of the CuAl₂（θ） phases; and the fracture mechanism of the Al-Cu wheel was intergranular fracture.更多还原