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Numerical Simulations Of Twin Formation And Extension In Thin Face-Centred Cubic Metallic Films, Romuald Bejaud, Sandrine Brochard, Julien Durick

Nanomechanical Testing in Materials Research and Development V

The basic mechanisms of plasticity in face-centred cubic materials are now well known in bulk materials. However, several experimental studies have shown that at the nanoscale, some of its mechanisms can induce surprising mechanical properties when compared to bulk behaviour. The formation and extension of twins in metallic nanowire can, for example, generate super-plasticity [1] or the presence of growth nano-twins within a material can lead to strengthening effects [2]. Atomic simulations are particularly adapted for studying the plasticity mechanisms at play, since they allow their visualization at the atomic scale.

While many atomistic simulations studies have been focused on …

Mechanical Response Of Face-Centered Cubic Metallic Nanospheres Under Uniaxial Compression, Selim Haj Salah, Celine Gerard, Laurent Pizzagalli

Nanomechanical Testing in Materials Research and Development V

The mechanical response of metallic nanoparticles has recently attracted a lot of interest due to their specific properties compared to their bulk counterpart, which allow for novel applications in various fields, e.g., composite materials, nanomanufacturing/nano-electromechanical systems. We have employed Molecular Dynamic simulations to study the mechanical behavior of face-centered cubic metallic nanoparticles. Uniaxial compression of monocrystalline nanosphere is investigated using the EAM potentials developed by Mishin et al. [1] [2]. The resulting behaviors vary with nanoparticle size, crystallographic orientation, and temperature. This work shows that the elastic modulus of metallic nanoparticles is higher than that of the bulk material. Three …

Irradiation-Induced Ductilization In The Zr-Based Metallic Glasses, Jaewon Heo, Sunghwan Kim, Seunghwa Ryu, Donchan Jang

Nanomechanical Testing in Materials Research and Development V

Crystalline metals in the nuclear energy system often suffer from the radiation-induced embrittlement which is resulted from the interaction between dislocation motions and the irradiation-induced changes in microstructures. This transition to the brittle failure may lower the mechanical stability of the irradiated components, posing significant threats to the operation and security of the entire mechanical system. In contrast to the crystalline metals, amorphous alloys, often called metallic glasses, have a different plasticity mechanism that does not involve the dislocation motion and hence are expected to exhibit the different irradiation effects on the mechanical from their crystalline counterparts. In this study, …