Design of bicontinuous metallic nanocomposites for high-strength and plasticity
Design of bicontinuous metallic nanocomposites for high-strength and plasticity
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DOI：
10.1016/j.matdes.2019.107602
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发表时间：
2019-03
影响因子：
8.4
通讯作者：
Yuchi Cui;B. Derby;Nan Li;A. Misra
中科院分区：
文献类型：
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作者：
Yuchi Cui;B. Derby;Nan Li;A. Misra
我们展示了铜/钼纳米复合薄膜的设计与双连续交织的形态高强度和塑性变形能力。通过在不同温度下共溅射Cu和Mo，制备了具有横向和随机浓度调制的纳米复合材料（LCM和RCM）。韧带的大小和一致性的Cu/Mo接口也通过沉积条件进行控制。研究发现，具有LCM结构和共格界面的纳米复合材料具有较高的强度，但变形能力有限。增强的变形能力时，接口被改变为半连贯的，虽然塑性是本地化的扭结带。由于剪切带和扭结带的抑制，具有半共格界面的RCM结构设计显示出高流动强度和塑性变形能力的出色结合。
We demonstrate design of Cu/Mo nanocomposite thin films with bicontinuous intertwined morphologies for high strength and plastic deformability. Through co-sputtering Cu and Mo at different temperatures, nanocomposites with lateral and random concentration modulations (LCMs and RCMs) were fabricated. Ligament size and coherency of the Cu/Mo interfaces was also controlled via the deposition conditions. It was discovered that nanocomposites with LCM structure and coherent interfaces have high strength but limited deformability. Enhanced deformability was achieved when the interface was altered to semi-coherent, although plasticity was localized in kink bands. The RCM structure design with semi-coherent interfaces showed an excellent combination of high flow strength and plastic deformability due to suppression of shear and kink bands.