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Dimension-dependent mechanical features of Au-nanocrystalline nanofilms

Nano Research 2023年第12期16卷 13400-13408页

作者： Lijun Ma Lena Du Shu Wang Qing Wang Shifeng Xue Hanxing Zhu Qian Liu Department of Engineering Mechanics College of Pipeline and Civil EngineeringChina University of Petroleum(East China)Qingdao 266580China CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology&University of Chinese Academy of SciencesBeijing 100190China Department of Physics Capital Normal UniversityBeijing 100048China School of Engineering Cardiff UniversityCardiff CF243AAUK MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Physics InstituteSchool of PhysicsNankai UniversityTianjin 300457China College of mechanical and Architectural Engineering Taishan UniversityTai’an 271000China

For metal nanofilms composed of nanocrystals,the multiple deformation mechanisms will coexist and bring unique and complex elastic-plastic and fracture mechanical *** successfully fabricating large quantities of uniform doubly-clamped suspended gold(Au)nanobeams with different thicknesses and nanograin sizes,we obtain full-spectrum mechanical features with statistical significance by combining atomic force microscopy(AFM)nanoindentation experiments,nonlinear theoretical model,and numerical *** yield and breaking strengths of the Au nanobeams have a huge increase by nearly an order of magnitude compared with bulk Au and exhibit strong nonlinear effects,and the corresponding strong-yield ratio is up to 4,demonstrating extremely high strength reserve and vibration *** strong-yield ratio gradually decreases with decreasing thickness,identifying a conversion of the failure type from ductile to ***,the Hall–Petch relationship has been identified to be still valid at the nanoscale,and K in the equation reaches 4.8 Gpa·nm1/2,nearly twice of bulk nanocrystalline Au,which is ascribed to the coupling effect of nanocrystals and nanoscale thickness.

关键词： nanocrystalline Au nanobeams atomic force microscopy numerical simulations full-spectrum mechanical properties

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