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首页> 外文期刊>International Journal of Electrochemical Science >The Mechanical Behavior and Microstructure of a Multilayer Nanostructured Ni-Co Alloy Fabricated by Electrodeposition
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The Mechanical Behavior and Microstructure of a Multilayer Nanostructured Ni-Co Alloy Fabricated by Electrodeposition

机译：电沉积材料制造的多层纳米结构Ni-Co合金的力学行为和微观结构

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摘要

A bulk multilayer nanostructured Ni-Co alloy with nano-grains (NG) layer with a thickness of 2.7?m and ultrafine grains (UFG) layer with a thickness of 0.9?m alternately grown is fabricated by an electrodeposition process. The analysis from X-ray diffractometer and transmission electron microscope reveal that the well-defined alternative layers consists of NG with a mean size of 23 nm with a random growth and UFG with a mean size of 90 nm along a (200) preferential growth. Tensile tests show that the multilayer nanostructured Ni-Co alloy exhibits an enhanced ductility with an elongation to failure of 14.2% and higher ultimate tensile strength of 1851MPa compared with the monolithic UFG and NG counterparts. The enhanced ductility for the multilayer nanostructured Ni-Co alloy is attributed to the improvement of work hardening ability brought by the action of the special microstructure involving the periodical distribution of UFG layer, the existence of interface and the alternation of crystal orientation between the layers in the dislocation activities and the effective adjustment to the local stress concentration brought by the periodic existence of the UFG layer in this layer structure. The higher strength sourced from the extra reinforcement provided by the hinder of interface to dislocation movement.
机译：通过电沉积工艺制造具有厚度为2.7μm和厚度为0.9Ωm的厚度为2.7μm和超细晶粒（UFG）层的散粒多层纳米结构的Ni-Co合金。来自X射线衍射仪和透射电子显微镜的分析表明，明确定义的替代层由NG组成，其平均尺寸为23nm，随机生长和UFG，沿（200）优先生长的平均尺寸为90nm。拉伸试验表明，与整体式UFG和NG对应相比，多层纳米结构Ni-Co合金具有增强的延展性，其伸长率为14.2％，最终拉伸强度为1851MPa。多层纳米结构Ni-Co合金的增强延展性归因于所涉及UFG层的周期性分布的特殊微观结构的作用的工作硬化能力的改善，界面存在的界面存在以及层之间的晶体取向的交替该层结构中UFG层周期性存在于局部应力集中的脱位活动和有效调整。从近距离脱位运动提供的额外钢筋提供的更高强度。

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