Publication

Computer simulation of displacement cascades in nanocrystalline Ni

Maximo Pedro Victoria
2002
Journal Articles

Abstract

Large-scale molecular dynamics of cascade production of the primary damage state are performed in fcc nanocrystalline Ni of average grain diameters of 5 and 12 nm. Primary knock-on atom kinetic energies of 5-30 keV are simulated. During the thermal spike phase, significant atomic motion towards the surrounding grain boundary structure is observed, characterized by many replacement-collision sequences. Upon resolidification, the excess volume condenses to form vacancy dominated defects with a complex partial dislocation network forming at higher energies.

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https://infoscience.epfl.ch/entities/publication/1cdbc440-4c32-410d-91d6-ad5c27a61efd

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Maximo Pedro Victoria
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1cdbc440-4c32-410d-91d6-ad5c27a61efd

About this result

Related concepts (32)

Collision cascade

In condensed-matter physics, a collision cascade (also known as a displacement cascade or a displacement spike) is a set of nearby adjacent energetic (much higher than ordinary thermal energies) collisions of atoms induced by an energetic particle in a solid or liquid. If the maximum atom or ion energies in a collision cascade are higher than the threshold displacement energy of the material (tens of eVs or more), the collisions can permanently displace atoms from their lattice sites and produce defects.

Threshold displacement energy

In materials science, the threshold displacement energy (T_d) is the minimum kinetic energy that an atom in a solid needs to be permanently displaced from its site in the lattice to a defect position. It is also known as "displacement threshold energy" or just "displacement energy". In a crystal, a separate threshold displacement energy exists for each crystallographic direction. Then one should distinguish between the minimum (T_d,min) and average (T_d,ave) over all lattice directions' threshold displacement energies.

Binding energy

In physics and chemistry, binding energy is the smallest amount of energy required to remove a particle from a system of particles or to disassemble a system of particles into individual parts. In the former meaning the term is predominantly used in condensed matter physics, atomic physics, and chemistry, whereas in nuclear physics the term separation energy is used. A bound system is typically at a lower energy level than its unbound constituents.

Related publications (1)

Computer simulation of displacement cascades in nanocrystalline Ni

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