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利用固-液铸轧复合(简称SLCRB)技术,在d160 mm×150 mm二辊实验铸轧机上制备Cu/Al复合带,并对其界面扩散层的反应程度、反应产物组成及显微组织演变规律进行SEM、EDS和XRD分析。结果表明,铸轧液相熔池内,液态铝液与铜带接触后在其表面形成初始渗铝层,界面成分主要为α(Al)+Cu Al2,且扩散层厚度在高温下逐渐生长变厚,最厚处约为10μm;进入低于kiss点的固相区后,扩散层在剧烈轧制延伸变形作用下破裂,界面两侧原始基材被挤出接触后形成新的复合界面,在铸轧出口处形成沿轧制方向弥散分布的CuAl_2、CuAl和Cu9Al4,扩散层平均厚度由10μm减薄至5μm且较为均匀。剥离和折弯性能测试结果表明,所制备的Cu/Al复合带剥离断裂面出现在Al基体侧,断口呈显著韧性断裂,试件经90°~180°折弯后未出现界面撕裂现象。研究成果为高效短流程制备Cu/Al复合带提供了工艺基础。
Cu / Al composite tapes were prepared on d160 mm × 150 mm two-roll experimental casting mill by using solid-liquid casting and rolling compounding (SLCRB) technology. The reaction extent, reaction product composition and microstructure evolution of interfacial diffusion layer Regular SEM, EDS and XRD analysis. The results show that the initial aluminized layer is formed on the surface of the molten liquid molten pool, and the interface of the molten aluminum liquid is mainly α (Al) + Cu Al2. The thickness of the diffusion layer grows and thickens at high temperature , The thickest at about 10μm; into the kiss below the kiss point of the solid phase zone, the diffusion layer under the severe rolling deformation under the rupture of the interface on both sides of the original substrate is extruded out to form a new composite interface in the casting The CuAl_2, CuAl and Cu9Al4 dispersedly distributed along the rolling direction at the exit of the rolling mill. The average thickness of the diffusion layer was reduced from 10μm to 5μm and more uniform. Peeling and bending test results show that the prepared fracture surface of Cu / Al composite strip appears on the side of Al matrix and the fracture shows a significant ductile fracture. No tearing phenomenon occurs after 90 ° ~ 180 ° bending. The research results provide a technological basis for preparing Cu / Al composite tapes with high efficiency and short flow.