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Molecular dynamics simulations of irradiation of alpha-Fe thin films with energetic Fe ions under channeling conditions

Publications associées (57)

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Driven mobility of self-interstitial defects under electron irradiation

In situ electron microscope observations of defects show that the incident high-energy electrons influence the evolution of microstructure of an irradiated material, reducing the number of defects seen in the field of view of the microscope. We investigate ...

2007

Physico-chemical study of the focused electron beam induced deposition process

Tristan Bret

The focused electron beam induced deposition process is a promising technique for nano and micro patterning. Electrons can be focused in sub-angström dimensions, which allows atomic-scale resolution imaging, analysis, and processing techniques. Before the ...

EPFL2005

The relationship between the irradiation induced damage and the mechanical properties of single crystal Ni

Zhongwen Yao

Irradiation is known to lead to a degradation of the mechanical properties of materials. This is particularly crucial in the case of materials that will be used in the future thermonuclear fusion reactor, where extremely high irradiation doses are expected ...

EPFL2005

Ion implantation in Ni-Ti shape memory alloy thin films

The present thesis focuses on the effect of 5 MeV Ni ion irradiation on the microstructure and the thermomechanical behavior in prestrained (ε∼4%) martensitic Ti-rich NiTi thin films. At this ion energy, damage is limited to a depth of approximately 2 µm ( ...

EPFL2005

Molecular dynamics simulations of phase formation and stability in the Al(Ni) system under irradiation

Molecular dynamics simulations of displacement cascades in aluminium, aluminium-nickel solid solutions and inhomogeneous samples containing amorphous or crystalline Al3Ni precipitates are performed. It is shown that no segregation occurs inside the displac ...

2005

A proposal for dichroic experiments in the electron microscope

Cécile Hébert

Building upon the similarities between inelastic electron scattering and X-ray absorption we show that dichroism can be observed in electron energy loss spectrometry (EELS) in the transmission electron microscope (TEM). Natural or magnetic linear dichroism ...

2003

SIA activity during irradiation of nanocrystalline Ni

Helena Van Swygenhoven

Cascade damage simulations in a 12 nm nanocrystalline Ni sample are presented. Sinks present in the sample such as grain boundaries and vacancy defects influence the movement of self-interstitial atoms (SIAs). Two temporal mechanisms of SIA activity during ...

2003

Contribution to quantitative measurement of the In composition in GaN/InGaN multilayers

Nicolas Grandjean

The In composition is investigated in GaN/InGaN multi-quantum wells (QWs) by measurement of the local lattice distortion in high-resolution electron microscopy (HREM) images taken along the [1120] zone axis by image processing. The direct peak-finding proc ...

2003

Transition structure at the Si(100)-SiO2 interface

Alfredo Pasquarello, Angelo Bongiorno

We characterize the transition structure at the Si(100)-SiO2 interface by addressing the inverse ion-scattering problem. We achieve sensitivity to Si displacements at the interface by carrying out ion-scattering measurements in the channeling geometry for ...

2003

Primary damage formation in molybdenum: a computer simulation study

The primary damage formation in Mo is investigated using molecular dynamics (MD) simulation with embedded-defect (ED) and embedded-atom method (EAM) interatomic potentials. The former is similar in spirit to the latter but includes an approximate treatment ...

2002