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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.
Using annealed industrial pure aluminum and pure copper ribbons as raw materials, eight layers of copper ribbons and seven layers of aluminum ribbons are stacked alternately in a manner of alternation. The materials are subjected to self-developed micro-forming mills at room temperature In the absence of any intermediate annealing and other heat treatment, when the cumulative strain reaches 83%, the OM observation shows that there is a new phase at the Cu / Al interface after the cold rolling deformation.After SEM / EDS analysis , Found that these new phase is a mixture of the intermetallic compounds Al2Cu / AlCu / Al_4Cu_9 is obtained by the reaction diffusion of these intermetallic compounds and the original metal matrix constitutes a new composite material is of particular interest: Due to the fact that the temperature rise during the rolling process is lower than 28 ℃ due to both the measured and the finite element simulation calculations, the reaction diffusion is not due to the common “hot” effect but due to the stress- This phenomenon is called deformation-induced reaction diffusion, and its mechanism is analyzed and elaborated.The results of this study is an experimental evidence of intermetallic compound obtained at room temperature processing, in order to obtain a new type of composite materials Provide a new way path.