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Kinetic Monte Carlo simulations of d...

Wen, Ming.

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Kinetic Monte Carlo simulations of defect nano-mechanics with applications to dislocation dynamics in irradiated alpha-iron.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Kinetic Monte Carlo simulations of defect nano-mechanics with applications to dislocation dynamics in irradiated alpha-iron./
作者:	Wen, Ming.
面頁冊數:	133 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0508.
Contained By:	Dissertation Abstracts International67-01B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3202793
ISBN:	9780542508943

Kinetic Monte Carlo simulations of defect nano-mechanics with applications to dislocation dynamics in irradiated alpha-iron.
Wen, Ming.

Kinetic Monte Carlo simulations of defect nano-mechanics with applications to dislocation dynamics in irradiated alpha-iron. - 133 p.

Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0508.

Thesis (Ph.D.)--University of California, Los Angeles, 2005.

Experimental observations of dislocation decoration with Self Interstitial Atom (SIA) clusters, and of SIA cluster rafts are analyzed to establish the mechanisms controlling these phenomena in bcc metals. The elastic interaction between SIA clusters, and between clusters and dislocations is included in Kinetic Monte Carlo (KMC) simulations of damage evolution in irradiated bcc metals. The results indicate that SIA clusters, which normally migrate by one-dimensional (I-D) glide, rotate due to their elastic interactions, and that this rotation is necessary to explain experimentally-observed dislocation decoration and raft formation in neutron-irradiated pure iron. The critical dose for raft formation in iron is shown to depend on the intrinsic glide/rotation characteristics of SIA clusters. The model is compared with experimental observations for the evolution of defect cluster densities (sessile SIA clusters and nano-voids), dislocation decoration characteristics, and the conditions for raft formation.

ISBN: 9780542508943Subjects--Topical Terms:

783786
Engineering, Mechanical.

Kinetic Monte Carlo simulations of defect nano-mechanics with applications to dislocation dynamics in irradiated alpha-iron.
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245 1 0 $a Kinetic Monte Carlo simulations of defect nano-mechanics with applications to dislocation dynamics in irradiated alpha-iron.
300 $a 133 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-01, Section: B, page: 0508.
500 $a Adviser: N. M. Ghoniem.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2005.
520 $a Experimental observations of dislocation decoration with Self Interstitial Atom (SIA) clusters, and of SIA cluster rafts are analyzed to establish the mechanisms controlling these phenomena in bcc metals. The elastic interaction between SIA clusters, and between clusters and dislocations is included in Kinetic Monte Carlo (KMC) simulations of damage evolution in irradiated bcc metals. The results indicate that SIA clusters, which normally migrate by one-dimensional (I-D) glide, rotate due to their elastic interactions, and that this rotation is necessary to explain experimentally-observed dislocation decoration and raft formation in neutron-irradiated pure iron. The critical dose for raft formation in iron is shown to depend on the intrinsic glide/rotation characteristics of SIA clusters. The model is compared with experimental observations for the evolution of defect cluster densities (sessile SIA clusters and nano-voids), dislocation decoration characteristics, and the conditions for raft formation.
520 $a The parametric dislocation dynamics (PDD) method is modified to take into account inertial effects of moving dislocation, and used to investigate the in crease in the yield stress due to dislocation interaction with interstitial loops in the decoration region (source hardening), and with distributed nanoscale voids (distributed barriers). The combination of the two effects is compared with experimental measurements and a reasonably good agreement is shown. The study in this thesis indicates that at low damage dose levels, dislocation interaction with radiation-induced interstitial clusters in the dislocation decoration region is the main mechanism for the increase in yield strength, while at higher close levels, impediment of dislocation motion by randomly distributed obstacles dominates. The influence of radiation-induced defect clusters on dislocation mobility has also been investigated using models based on dislocation dynamics simulations.
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