室温轧制Cu/Al多层复合薄带的变形诱导反应扩散现象  

Deformation-induced reaction diffusion of Cu/Al multilayered composite by rolling at room temperature

作　　者：于庆波[1,2] 刘相华[2] 孙莹[1] 祁俊龙 

机构地区：[1]江苏理工学院机械工程学院,常州213001 [2]东北大学研究院,沈阳110819

出　　处：《中国科学：技术科学》2016年第11期1166-1174,共9页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:51374069);江苏省自然科学基金(批准号:BK20131123);江苏省'六大人才高峰'(编号:2012-ZBZZ-007);常州市应用基础研究计划(编号:CJ20160032)资助项目

摘　　要：以退火态工业纯铝、纯铜薄带为原料,将8层铜带、7层铝带,共15层以相互交替方式叠在一起,利用自行研制的微成形轧机,在室温下对其进行多道次轧制.在没有任何中间退火等热处理的情况下,当累积应变达到83%时,通过OM观察发现冷轧大变形后的Cu/Al界面处有新相形成.经SEM/EDS分析,发现这些新相是金属间化合物Al_2Cu/AlCu/Al_4Cu_9的混合物,是由反应扩散获得的产物.这些金属间化合物与原有的金属母体构成了一种新的复合材料.特别有意义的是:由于实测和有限元模拟计算两种方法都证实轧制过程中温升低于28℃,因此该反应扩散不是缘于常见的'热'作用,而是由于室温大变形轧制中应力-应变的作用.本文将这种现象称为变形诱导反应扩散,并对其机理进行了分析和阐述.该研究结果是在室温下加工获得金属间化合物的一个实验证据,为获得一类新型复合材料提供了新途径.Annealed pure copper and aluminum foils were selected as initial materials. They were alternately stacked（8 layers Cu and 7 layers Al） to form a sample with 15 layers. The sample was cold rolled on a micro-forming mill developed by ourself at room temperature. When accumulated reduction ratio reached 83% without intermediate annealing, some new phases were observed by optical microscopy at the interfaces of Cu/Al multilayers. The SEM/EDS analyses revealed that the phases are a mixture of intermetallic compounds Al2Cu/Al Cu/Al4Cu9, which indicates that reaction diffusion occurs at the Cu/Al interfaces during cold deformation. These intermetallic compounds and old matrix form a new composite. A point however to be very important is that both measuring and finite element simulation proved that the temperature-rise due to rolling is less than 28°C, so the reaction diffusion during cold rolling is not attributed to heat, but is attributed to stress and strain. In this study, the reaction diffusion is called deformation-induced reaction diffusion, the mechanism of which is also analyzed and explained. The study demonstrates that intermetallic compounds can be formed by cold working, providing a new method to obtain new composites.

关 键 词：反应扩散 负辊缝轧制 剧烈塑性变形 Cu/Al复合带 剪切应变能 

分 类 号：TG335.8[金属学及工艺—金属压力加工]