(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 采用自制的熱型連鑄設(shè)備制備鋁線材料，研究鑄型溫度和拉鑄速度等工藝參數(shù)對(duì)材料表面質(zhì)量、顯微組織及力學(xué)性能的影響，通過對(duì)最佳工藝條件下制備的鑄錠斷口形貌進(jìn)行觀察和分析，探討其相關(guān)機(jī)理。結(jié)果表明：當(dāng)鑄型溫度為675~685 ℃、拉鑄速度為90~120 mm/min時(shí)，可以制備出表面質(zhì)量較佳的鑄錠；同時(shí)，工藝參數(shù)會(huì)對(duì)晶體的擇優(yōu)取向產(chǎn)生一定影響，當(dāng)鑄型溫度和拉鑄速度分別為680 ℃和90 mm/min時(shí)，晶體的取向更傾向于沿á100？方向生長(zhǎng)，鑄型溫度越高，鑄錠力學(xué)性能越優(yōu)異。當(dāng)拉鑄速度為90 mm/min時(shí)，制備的熱型連鑄鋁線具有最佳的塑性加工能力。相比于普通多晶鋁線，熱型連鑄鋁線具有更好的塑性。
關(guān)鍵字: 熱型連鑄；表面質(zhì)量；晶體取向；力學(xué)性能；斷口形貌
（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
