(1. 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室，兰州 730050；
2. 兰州理工大学 有色金属合金省部共建教育部重点实验室，兰州 730050)
摘 要: 采用液-固轧制复合技术制备A356/6082层状复合板，研究浇注温度对A356/6082复合板界面组织及力学性能的影响。结果表明：当浇注温度偏高时，界面区激冷作用强烈，细小的共晶硅在界面处堆积，阻碍元素进一步扩散；当浇注温度偏低时，两种合金仅仅在轧制力作用下形成机械结合，其显微硬度值在界面附近发生突变，由82.4 HV骤降至61.5 HV；当浇注温度为660 ℃时，复合板界面区组织均匀，元素扩散宽度约为93 μm，实现了良好的冶金结合，其剪切强度最高可达到114.2 MPa；随着浇注温度的降低，复合板抗拉强度逐渐提高；当浇注温度为620 ℃时，其抗拉强度最大为205 MPa，断裂位置首先发生在A356铝合金一侧。
关键字: 液-固轧制；浇注温度；复合板；界面组织；力学性能
（1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China）
Abstract:A356/6082 laminated bimetal was fabricated by liquid-solid rolling composite technique. The effects of pouring temperature on interfacial microstructure and mechanical properties of A356/6082 bimetal were studied. The results indicate that when the pouring temperature is too high, the fine eutectic silicon accumulates at the interface owing to the strong chilling effect in the interface region, hindering the further diffusion of elements. When the pouring temperature is low, only a mechanical bond forms under rolling force in the transition region between the A356 aluminum alloy and 6082 aluminum alloy. In addition, the micro-hardness value of the transition region suddenly changes from 82.4 HV to 61.5 HV. When the pouring temperature is 660 ℃, the interfacial region of bimetal achieve the good metallurgical bond. The width of element diffusion is about 96 μm and the microstructure is uniform. Moreover, the interfacial shear strength of A356/6082 bimetal can reach up to 114.2 MPa. With the decrease of pouring temperature, the ultimate tensile strength of bimetal gradually increases. When the pouring temperature is 620 ℃, the ultimate tensile strength reaches up to 205 MPa, the fracture location occurs firstly in the side of A356aluminum alloy.
Key words: liquid-solid rolling; pouring temperature; bimetal; interface structure; mechanical properties
