Journal ArticleDOI
Energetics and formation kinetics of helium bubbles in metals
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In this paper, the formation kinetics of helium bubbles in metals are discussed, in particular for bubbles with radii between 10 and 1000 A containing helium under very high pressures (nonideal gas bubbles), and the bubble formation free energy is split into three parts: a helium bulk free energy which is considered for solid and fluid helium (high density equation of state), a bubble-matrix interface free energy for which curvature corrections are introduced, and a relaxation energy which was treated within the elastic continuum approach.Abstract:
Recent theoretical work on the energetics and formation kinetics of helium bubbles in metals is reviewed. The energetics are discussed in particular for bubbles with radii between 10 and 1000 A containing helium under very high pressures (nonideal gas bubbles). For this size range, the bubble formation free energy is split into three parts: a helium bulk free energy which is considered for solid and fluid helium (high-density equation of state), a bubble-matrix interface free energy for which curvature corrections are introduced, and a relaxation energy which is treated within the elastic continuum approach. The formation kinetics are considered for two extreme cases. For high helium production rates and low temperatures, helium clustering is associated with athermal processes such as metal interstitial emission and dislocation loop punching. For dislocation loop punching, an interpolation between computer simulation and continuum-theory results is discussed. For low helium production rates and h...read more
Citations
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Molecular dynamics investigations of surface damage produced by kiloelectronvolt self-bombardment of solids
TL;DR: In this paper, three separate mechanisms are identified: ballistic damage, viscous flow and microexplosions, and the relative importance of each mechanism depends on several parameters: atomic mass, melting temperature, atomic density, structure and atomic bonding of the target.
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Pressure of Neon, Argon, and Xenon Bubbles in Aluminum
TL;DR: In this paper, electron-energy-loss spectroscopy and transmission electron microscopy were used to determine the density and pressure of rare gases in aluminum by means of electron-diffraction patterns.
References
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Book
Theory of Dislocations
John Price Hirth,Jens Lothe +1 more
TL;DR: Dislocations in Isotropic Continua: Effects of Crystal Structure on Dislocations and Dislocation-Point-Defect Interactions at Finite temperatures.
Book ChapterDOI
The Continuum Theory of Lattice Defects
TL;DR: In this paper, the authors present a discussion on the continuum theory of lattice defects, which is the usual theory of elasticity modified to include internal stress, and discuss some of the background principles and illustrates them by specific examples.
Journal ArticleDOI
The role of vacancies and dislocations in the nucleation and growth of gas bubbles in irradiated fissile material
TL;DR: In this paper, it was shown that fine scale bubbles are to be expected in reasonably pure material, the bubbles nucleating either homogeneously with a spacing less than a micron or on any nucleation sites that may exist on this or a finer scale.
Journal ArticleDOI
Self-trapping of helium in metals
TL;DR: In this paper, it was shown that helium atoms in a metal lattice are able to cluster with each other, producing vacancies and nearby self-interstitial defects, and that the binding energy of each additional helium atom to these clusters increases with helium concentration.
Journal ArticleDOI
A new interatomic potential function for helium
TL;DR: In this paper, a new interatomic potential for helium is proposed of the form: with a=0·675 a, α=4·390 a -1, β=3·746 × 10-4 a -6 and A=398·7 ev.