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Fracture of Sub-20nm Ultrathin Gold Nanowires

Yang Lu's picture

Adv. Funct. Mater.  DOI: 10.1002/adfm.201101224

Fracture of metals at the nanoscale and corresponding failure mechanisms have recently attracted considerable interest. However, quantitative in situ fracture experiments of nanoscale metals are rarely reported. Here it is shown that, under uni-axial tensile loading, single crystalline ultrathin gold nanowires may fracture in two modes, displaying distinctively different fracture morphologies and ductility. In situ high resolution transmission electron microscopy (HRTEM) studies suggest that the unexpected brittle-like fracture was closely related to the observed twin structures, which is very different from surface dislocation nucleation/propagation mediated mechanism in ductile fracture mode. Molecular dynamics (MD) simulations further reveal the processes of shear-induced twin formation and damage initiation at the twin structure/free surface interface, confirming the experimentally observed differences in fracture morphology and ductility. Finally, a fracture criterion based on competition between twin formation and surface dislocation nucleation/propagation as a function of misalignment angle is discussed. 

Link: http://onlinelibrary.wiley.com/doi/10.1002/adfm.201101224/abstract (full paper PDF attached) 

Comments

dear yang sir,

i am a Ph.D. student in chonbuk national university, south korea. i need a sound research problem for composite materials. would you please guide me some genuine problems with regard to composite materials as used in wind turbines? i am looking forward to hearing from you soon.

anil kunwar department of mechanical design chonbuk national university republic of korea

Yang Lu's picture

Thank you for your interest in our work, anil kunwar.

Frankly I'm not very familiar with this field, but you can always get help from latest literatures. Here I attached the links for two recent papers on this topic and wish these are helpful:

http://www.ingentaconnect.com/content/maney/ema/2008/00000003/00000001/a...

http://www.scientific.net/MSF.654-656.2612

good luck!

 

 dear sir,

thank you very much for the guidance. your suggestions have become so helpful to start my research works. 

anil kunwar

Hello Everyone,

                     I am M.Tech(CAD CAM) Student. My interested topic is resistence of creck propogation using nano composites. i refered the paper "In situ multiscale analysis of fracture mechanics in nanocomposites" from ELSEVIER. I can't go through practicle work considering facilities in University and time. i have to complete my project within May,2012. I am intresting in Random particle(nano) configuration in material. so many things invoved in this topic.  Regarding my topic can u please help me?

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