(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要: 采用自制的热型连铸设备制备铝线材料，研究铸型温度和拉铸速度等工艺参数对材料表面质量、显微组织及力学性能的影响，通过对最佳工艺条件下制备的铸锭断口形貌进行观察和分析，探讨其相关机理。结果表明：当铸型温度为675~685 ℃、拉铸速度为90~120 mm/min时，可以制备出表面质量较佳的铸锭；同时，工艺参数会对晶体的择优取向产生一定影响，当铸型温度和拉铸速度分别为680 ℃和90 mm/min时，晶体的取向更倾向于沿á100？方向生长，铸型温度越高，铸锭力学性能越优异。当拉铸速度为90 mm/min时，制备的热型连铸铝线具有最佳的塑性加工能力。相比于普通多晶铝线，热型连铸铝线具有更好的塑性。
关键字: 热型连铸；表面质量；晶体取向；力学性能；断口形貌
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metals Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:Aluminum wires were prepared using the self-made Ohno continuous casting equipment. The effects of process parameters, such as the mold temperature and casting rate, on the surface quality, microstructure and mechanical properties of aluminum wires were investigated. Besides, the microstructures of fracture surfaces of Al wires prepared under optimal process parameters were evaluated, and the relevant mechanisms were identified. The results show that the Al ingots with good surface quality can be successfully fabricated at the mold temperature of 675-685 ℃ and the casting speed of 90-120 mm/min. Meanwhile, the process parameters have a great effect on the preferred orientation of crystals. When the mold temperature is 680 ℃ and the casting speed is 90 mm/min, the crystal orientation of grain tends to grow along the direction of á100？. Moreover, when the casting speed is constant, the mechanical properties of ingots are improved with the increasing mold temperature. Furthermore, when the casting speed is 90 mm/min, the plastic processing capacity is the best. In comparison to polycrystalline Al wires, the Al wires prepared by Ohno continuous casting have better integrated performance.
Key words: Ohno continuous casting; surface quality; crystal orientation; mechanical property; fracture morphology
