It is interesting to imagine what would happen when a mixture of soft-boiled eggs and stones is deformed together. A foil made of pure Ti is stronger than that made of Cu. When a composite Cu/Ti foil deforms, the harder Ti will penetrate into the softer Cu in the convex shapes according to previously reported results. In this paper, we describe the fabrication of multilayer Cu/Ti foils by the roll bonding technique and report our observations. The experimental results lead us to propose a new deformation mechanism for a hard metal surrounded by a soft metal during rolling of a laminated foil, particularly when the thickness of hard metal foil (Ti, 25 μm) is much less than that of the soft metal foil (Cu, 300 μm). Transmission Electron Microscope (TEM) imaging results show that the hard metal penetrates into the soft metal in the form of concave protrusions. Finite element simulations of the rolling process of a Cu/Ti/Cu composite foil are described. Finally, we focus on an analysis of the deformation mechanism of Ti foils and its effects on grain refinement, and propose a grain refinement mechanism from the inside to the outside of the laminates during rolling.
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机译：有趣的是，当煮鸡蛋和石头的混合物一起变形时会发生什么。纯钛制成的箔比铜制成的箔更坚固。当复合Cu / Ti箔变形时，根据先前报道的结果，较硬的Ti将以凸形渗透到较软的Cu中。在本文中，我们描述了通过辊焊技术制造多层Cu / Ti箔并报告了我们的观察结果。实验结果使我们提出了一种新的变形机制，适用于层压箔轧制过程中被软金属包围的硬金属，特别是当硬金属箔的厚度（Ti，25μm）比软金属的厚度小得多时箔（铜，300μm）。透射电子显微镜（TEM）成像结果表明，硬金属以凹入突起的形式渗入软金属。描述了Cu / Ti / Cu复合箔轧制过程的有限元模拟。最后，我们着重分析了钛箔的变形机理及其对晶粒细化的影响，并提出了轧制过程中从层压板内部到外部的晶粒细化机理。
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