Liouville field theory: Difference between revisions

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-'''Radiation materials science''' describes the interaction of radiation with [[matter]]: a broad subject covering many forms of [[irradiation]] and of matter.
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-==Main aim of radiation material science==
-Some of the most profound effects of [[irradiation]] on materials occur in the core of [[nuclear reactor technology|nuclear power reactors]] where atoms comprising the structural components are displaced numerous times over the course of their engineering lifetimes. The consequences of radiation to core components includes changes in [[shape]] and [[volume]] by tens of percent, increases in [[hardness]] by factors of five or more, severe reduction in [[ductility]] and increased [[embrittlement]], and susceptibility to environmentally induced cracking. For these structures to fulfill their purpose, a firm understanding of the effect of radiation on materials is required in order to account for irradiation effects in design, to mitigate its effect by changing operating conditions, or to serve as a guide for creating new, more radiation-tolerant materials that can better serve their purpose.
-== Radiation ==
-{{Main|Radiation}}
-The types of radiation that can alter structural materials consist of [[Neutron radiation|neutrons]], [[Ionizing radiation|ions]], [[electrons]] and [[gamma rays]]. All of these forms of radiation have the capability to displace atoms from their lattice sites, which is the fundamental process that drives the changes in structural metals.The inclusion of ions among the irradiating particles provides a tie-in to other fields and disciplines such as the use of [[Particle accelerator|accelerators]] for the [[Nuclear transmutation|transmutation]] of [[Radioactive waste|nuclear waste]], or in the creation of new materials by [[ion implantation]], [[ion beam mixing]], [[Plasma-immersion ion implantation|plasma assisted ion implantation]] and [[Ion beam deposition|ion beam assisted deposition]].
-The effect of irradiation on materials is rooted in the initial event in which an energetic projectile strikes a target. While the event is made up of several steps or processes, the primary result is the [[single displacement reaction|displacement]] of an atom from its lattice site. [[Irradiation]] displaces an atom from its site, leaving a vacant site behind (a [[Vacancy defect|vacancy]]) and the displaced atom eventually comes to rest in a location that is between lattice sites, becoming an [[Interstitial defect|interstitial]] atom. The vacancy-interstitial pair is central to radiation effects in crystalline solids and is known as a [[Frenkel pair]] (FP). The presence of the Frenkel pair and other consequences of irradiation damage determine the physical effects, and with the application of [[stress (mechanics)|stress]], the mechanical effects of irradiation by the occurring of interstitial, phenomena, such as [[Neutron-induced swelling|swelling]], [[cell growth|growth]], [[phase transition]], [[Segregation in materials|segregation]], etc., will be effected. In addition to the atomic displacement, an energetic charged particle moving in a lattice also gives energy to electrons in the system, via the [[Stopping power (particle radiation)|electronic stopping power]]. This energy transfer can also for high-energy particles produce damage in non-metallic materials, as so called [[ion tracks]].<ref name="Mef94">
-{{cite journal
- |author=A. Meftah ''et al.''
- |year=1994
- |title=Track formation in SiO<sub>2</sub> quartz and the thermal-spike mechanism
- |journal=[[Physical Review B]]
- |volume=49 |pages=12457
- |doi=10.1103/PhysRevB.49.12457
- |bibcode = 1994PhRvB..4912457M
- |issue=18 }}</ref><ref name="Tra00">
-{{cite journal
- |author=C. Trautmann, S. Klaumünzer, H. Trinkaus
- |year=2000
- |title=Effect of Stress on Track Formation in Amorphous Iron Boron Alloy: Ion Tracks as Elastic Inclusions
- |journal=[[Physical Review Letters]]
- |volume=85 |pages=3648
- |doi=10.1103/PhysRevLett.85.3648
- |bibcode=2000PhRvL..85.3648T
- |issue=17
-}}</ref>
-[[Image:cascade sequence.png|right|thumb|Image sequence of the time development of a collision cascade in the heat spike regime produced by a 30 keV Xe ion impacting on Au under channeling conditions. The image is produced by a classical [[molecular dynamics]] simulation of a collision cascade. The image shows a cross section of two atomic layers in the middle of a threedimensional simulation cell. Each sphere illustrates the position of an atom, and the colors show the kinetic energy of each atom as indicated by the scale on the right. At the end, both [[point defect]]s and [[dislocation]] loops remain.]]
-== Radiation damage ==
-{{main|Radiation damage}}
-The radiation damage event is defined as the transfer of energy from an incident projectile to the solid and the resulting distribution of target atoms after completion of the event. This event is composed of several distinct processes:
-# The interaction of an energetic incident particle with a lattice atom
-# The transfer of [[kinetic energy]] to the lattice atom giving birth to a [[primary knock-on atom]] (PKA)
-# The displacement of the atom from its lattice site
-# The passage of the displaced atom through the lattice and the accompanying creation of additional knock-on atoms
-# The production of a [[collision cascade|displacement cascade]] (collection of point defects created by the PKA)
-# The termination of the PKA as an interstitial
-The result of a radiation damage event is, if the energy given to a lattice atom is above the [[threshold displacement energy]],  the creation of a collection of [[Crystallographic defect#Point defects|point defects]] (vacancies and interstitials) and clusters of these defects in the crystal lattice.
-The essence of the quantification of radiation damage in solids is the number of displacements per unit volume per unit time <math>R</math> :
-:<math> R = N \int_{E_{min}}^{E_{max}} \int_{T_{min}}^{T_{max}} \phi(E_i)\,\sigma(E_i,T)\,\upsilon(T)\,dT\,dE_i. </math>
-where <math>N</math> is the atom number density, <math>E_{max}</math> and <math>E_{min}</math> are the maximum and minimum energies of the incoming particle, <math>\phi(E_i)</math> is the energy dependent particle flux, <math>T_{max}</math> and <math>T_{min}</math> are the maximum and minimum energies transferred in a collision of a particle of energy <math>E_i</math> and a lattice atom, <math>\sigma(E_i,T)</math> is the [[Neutron cross-section|cross section]] for the collision of a particle of energy <math>E_i</math> that results in a transfer of energy <math>T</math> to the struck atom, <math>\upsilon(T)</math> is the number of displacements per primary knock-on atom.
-The two key variables in this equation are <math>\sigma(E_i,T)</math> and <math>\upsilon(T)</math>. The term <math>\sigma(E_i,T)</math> describes the transfer of energy from the incoming particle to the first atom it encounters in the target, the primary knock-on atom (PKA); The second quantity <math>\upsilon(T)</math> is the total number of displacements that the PKA goes on to make in the solid; Taken together, they describe the total number of displacements caused by an incoming particle of energy <math>E_i</math>, and the above equation accounts for the energy distribution of the incoming particles. The result is the total number of displacements in the target from a flux of particles with a known energy distribution.
-In radiation material Science the displacement damage in the alloy ( <math>\left[ dpa \right]</math> = '''displacements per atom in the solid''' ) is a better representation of the effect of irradiation on materials properties than the fluence ( neutron fluence, <math>\left[ MeV \right]</math> ).
-== Resource ==
-* Fundamentals of Radiation Material Science, Gary S. Was, Springer-Verlag Berlin Heidelberg 2007
-* R. S. Averback and T. Diaz de la Rubia (1998). "Displacement damage in irradiated metals and semiconductors". In H. Ehrenfest and F. Spaepen. Solid State Physics 51. Academic Press. pp. 281–402.
-* R. Smith, ed. (1997). Atomic & ion collisions in solids and at surfaces: theory, simulation and applications. Cambridge University Press. ISBN 0-521-44022-X.
-==References==
-{{Reflist}}
-[[Category:Materials science| ]]
-[[Category:Building engineering]]

Liouville field theory: Difference between revisions

Latest revision as of 23:40, 7 January 2015

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