Structural characteristics of Cu/Ti bimetal composite produced by accumulative roll-bonding (ARB)
Structural characteristics of Cu/Ti bimetal composite produced by accumulative roll-bonding (ARB)
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DOI：
10.1016/j.matdes.2016.09.094
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发表时间：
2017-01-05
影响因子：
8.4
通讯作者：
Kim, Dong-Ik
中科院分区：
文献类型：
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作者：
Hosseini, M.;Pardis, N.;Kim, Dong-Ik
采用累积叠轧焊（ARB）技术制备了Cu/Ti纳米复合材料，并对该复合材料的组织特征进行了实验研究和有限元分析。通过光学显微镜和扫描电镜研究了复合层的宏观组织演变。此外，透射电子显微镜（TEM）以及能量色散X射线光谱（EDX）技术被用于详细的微观结构调查。根据实验结果设计了不同的有限元模拟。结合宏观组织观察结果，更好地了解钛增强体的破碎机制。在3个循环的ARB处理后观察到Ti层的颈缩，发现在成分充分加工硬化后，在剪切带处发生颈缩。进一步加工导致透镜形Ti成分破碎和分布。有人发现，这样的形状演变使得它更难以变形的Ti段进一步应变，因此，更局部化的应变集中发生在这些段附近的Cu基体内。TEM观察到一个显着的晶粒细化的高应变复合材料。对Cu/ Ti纳米复合材料进行了ARB处理，得到了分布在超细晶Cu基体中的纳米结构Ti增强体。(C)2016爱思唯尔有限公司版权所有
Cu/Ti nanostructured bimetal composite was produced by accumulative roll-bonding (ARB) technique and the structural characteristics of this composite were studied both experimentally and by finite element analysis. Macrostructure evolution of the composite layers was investigated by optical and scanning electron microscopes. In addition, transmission electron microscopy (TEM) as well as energy-dispersive X-ray spectroscopy (EDX) techniques were utilized for detailed microstructural investigations. Different finite element simulations were designed based on the experimental results. The results were combined with macrostructural observations to gain a better insight into the fragmentation mechanismof the Ti reinforcements. Necking of the Ti layers was observed after 3 cycles of ARB processing which was found to happen at shear bands, after sufficient work-hardening of the constituents. Further processing resulted in fragmentation and distribution of lens shaped Ti constituents. It was found that such a shape evolution makes it more difficult to deform the Ti segments by further straining and consequently, a more localized strain concentration happens within the Cu matrix near these segments. A significant grain refinement was observed by TEM investigation of the highly strained composite. ARB processing of Cu/ Ti bimetal composite resulted in nanostructured Ti reinforcements distributed within an ultrafine-grained Cu matrix. (C) 2016 Elsevier Ltd. All rights reserved.