Cu/Al双辊异温铸轧复合界面局部熔合机理  

Mechanism of interface local fusion for Cu/Al cladding strip fabricated in twin-roll casting and bonding process at different temperatures

作　　者：黄华贵[1] 刘文文[1] 叶丽芬[1] 杜凤山[1] 

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004

出　　处：《哈尔滨工程大学学报》2016年第3期432-437,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金面上资助项目(51474189)

摘　　要：以传统双辊铸轧工艺为基础,采用金属熔体触辊凝固制备Cu、Al带坯并轧制复合,利用高温Cu带与Al带强压接触传热及其产生的Al带表面浅层熔化现象,提出一种基于界面"局部熔合"的Cu/Al双辊异温铸轧复合工艺。利用非线性热-力耦合有限元方法,数值模拟分析了Cu带和Al带初始温度Tc和Ta、层厚比K、压下率ε对Cu/Al复合界面接触换热与温度分布的影响规律,给出了实现界面"局部熔合"的工艺条件。在自制的物理模拟装置上进行Cu/Al异温压力复合实验,并通过界面的SEM、EDS分析,验证了Cu/Al界面"局部熔合"的工艺条件,揭示了Cu-Al二元合金反应扩散是"局部熔合"作用下Cu/Al界面冶金结合的主要机制。Baded on the traditional twin-roll casting and rolling process,we propose a new technology to fabricate Cu / Al layered strips based on local fusion of the contact bonding interface. First,component strips of Cu and Al were produced by pouring liquid metal onto the roller surface,and then feeding them both into the roll bite. We found a melting phenomenon on the skin layer of the Al strip,caused by heat conduction between the Cu and Al strips at high temperature and contact pressure in the rolling deformation zone. Through a numerical simulation using the nonlinear thermal-mechanical coupled finite element method,we investigate the influence of the initial temperature of the Cu and Al strips Tc,Ta,the thickness ratios K,the reduction ε on the contact heat transfer,and the distribution of the bonding interface temperature,and present the process conditions necessary for achieving local fusion at the bonding interface. We also design a special physical simulation device to conduct the Cu / Al bonding experiment under different temperatures and contact pressures. The scanning electron microscopy（ SEM） and energy dispersive spectroscopy（ EDS） analysis results of the bonding interface show that Cu-Al binary alloy reaction diffusion is the main mechanism of the Cu / Al interface metallurgical bonding under the effect of local fusion.Hence,we have verified the process conditions necessary for local fusion of the Cu / Al bonding interface.

关 键 词：Cu/Al复合板 异温铸轧复合 局部熔合 反应扩散 冶金结合 

分 类 号：TG335[金属学及工艺—金属压力加工]