球介在物近傍における単結晶アルミニウムと銅のプリズマティック転位の形成と臨界せん断応力の推定 : 分子動力学法によるシミュレーション Formation and Critical Shear Stresses of Prismatic Dislocation Loops Observed around Spherical Precipitate in Single Crystalline Aluminum and Copper Matrices : Simulations by Molecular Dynamics

Prismatic dislocation loops have so far been observed around the misfitting particle embedded in the matrix. They are generated from the precipitate-matrix interface on which the local shear stress in the maximum. In the present study, the dislocation emissions and the subsequent formation of the prismatic dislocation loop around the inclusion embedded in the single crystalline aluminum or copper matrix are simulated by molecular dynamics. At a result, the maximum shear stress occurs at the precipitate-matrix interface on the {1 1 1} plane intersecting the spherical precipitate at the height of R_p/√<2>. Afterwards, the prismatic dislocation loops, which have the same gliding direction but not on the same slip planes, are attained by energetically unstable interactions around the precipitate. The representative size of the prismatic dislocation loop is found to depend on the diameter of the precipitate.