首页|具有高度(220)取向垂直纳米孪晶异质结构铜薄膜的强化机制研究

具有高度(220)取向垂直纳米孪晶异质结构铜薄膜的强化机制研究

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在本工作中，我们通过直流电沉积方法制备了含有不同体积比的(220)取向垂直纳米孪晶异质结构的铜薄膜，并表征了其力学性能。单轴拉伸测试表明，当垂直纳米孪晶的体积比增加时，机械性能显著提高:具有88％垂直孪晶的薄膜的极限拉伸强度为455 MPa，约比等轴晶粒铜薄膜的强度高83％。通过对拉伸后样品进行高分辨电子显微镜表征，并辅以分子动力学模拟，我们揭示了含有等轴晶粒和垂直纳米孪晶的特殊异质结构有助于激活铜薄膜材料内部多种模式的滑移系统，并导致更高的位错密度，从而在赋予材料更强的机械强度和加工硬化率的同时，不会显著损失材料的韧性。
Strengthening mechanisms in heterostructured copper films with highly(220)-oriented vertical nanotwins
In this study,heterostructured copper films containing different proportions of highly(220)-oriented vertical nanotwins were prepared by direct current(DC)electroplating.Uniaxial tensile tests showed that the mechanical properties improved notably when the volume ratio of the vertical nanotwins increased-the film with the 88％vertical twins exhibited the ultimate tensile strength of 455 MPa,approximately 83％higher than those of the equiaxed Cu films.Postmortem electron microscopy characterizations,assisted by molecular dynamics simulations,revealed that these special heterostructures of the equiaxed grains and vertical nanotwins facilitated the activation of multi-mode slip systems.The activation of multi-mode slip systems leads to higher dislocation density,thus endowing the material with enhanced mechanical strength and work hardening rate without significant loss of ductility.

DC ElectrodepositionVertical twinsMechanical propertiesDislocation mechanism

韦小丁、张鹏、马瑜薇、刘俊杰、於中良、丛超男

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State Key Laboratory for Turbulence and Complex System,Department of Mechanics and Engineering Science,College of Engineering,Peking University,Beijing 100871,China

Institute for Advanced Materials and Technology University of Science and Technology Beijing,Beijing 100083,China

Department of Engineering Mechanics,Beijing University of Technology,Beijing 100124,China

College of Mechanical Engineering,Yangzhou University Yangzhou 225127,China

College of Science,China Agricultural University,Beijing 100083,China

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DC Electrodeposition Vertical twins Mechanical properties Dislocation mechanism

国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家重点研发计划国家重点研发计划

1217200511988102118906812022YFB38061002020YFE0204200

2024

10.1007/s10409-023-23371-x

力学学报(英文版)

力学学报(英文版)

CSTPCD
影响因子：0.363
ISSN：0567-7718
年,卷(期)：2024.40(1)
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