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Molecular dynamics and quasi-two dimensional dislocation dynamics simulations on the hardening mechanism of FCC metals

FCC金属の硬化機構に関する分子動力学及び準2次元転位動力学シミュレーション

板倉 充洋  ; 門吉 朋子*; 蕪木 英雄; 實川 資朗

Itakura, Mitsuhiro; Kadoyoshi, Tomoko*; Kaburaki, Hideo; Jitsukawa, Shiro

分子動力学及び準2次元転位動力学法により、FCC金属の硬化メカニズムの数値シミュレーションを実施した。本研究では、FCC金属中において発生する転位の拡張及びピンニングサイトの密度,分布,強度が材料の応力-ひずみ関係にどのように依存するかを予測するものである。ここでは、特に強い硬化をもたらす硬い粒子と刃状,らせん転位との相互作用を詳しく調べ、材料硬化の基本的メカニズムを明らかにする。

Molecular dynamics and quasi-two dimensional dislocation dynamics simulations have been performed to find the hardening mechanism of FCC metals due to irradiation. The focus of this simulation has been placed on the effects of the dissociation of a dislocation in FCC metals and of density, distribution, and strength of pinning centers on the stress-strain relation. Molecular dynamics method is applied to find the behavior of the interaction of an edge or a screw dislocation with a pinning center, such as a rigid sphere or irradiation-induced hexagonal interstitial cluster, and to measure its pinning strength by deriving the stress-strain relation.

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