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Particle Fluxes (neutrons, charged particles, photons)
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When materials are exposed to energetic particles, such as structural materials in fission reactors or semi-conductors during ion beam processing, many point defects (vacancies and interstitials) are created in a displacement cascade. The cascade occurs over very short time and spatial scales (~ps and nm) and initiates a complex microstructural evolution that can alter both mechanical and physical properties. |
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Displacement Cascade In Iron: 5 keV, 100K, 128k atoms
(red spheres – vacant lattice sites, green spheres – interstitial atoms) |
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Time evolution for the number of vacancies in displacement cascades in iron at 100K for different PKA energies. |
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Defect configurations in 20 keV displacement cascade: (a) peak damage state at 0.3 ps, and final defect configuration after 20 ps. Red spheres are vacant lattice sites and green spheres are atoms in interstitial lattice positions. |
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