Model of formation of broken dislocation boundaries at joint disclinations

Elasticity Boundary-Value Problems for Straight Wedge Disclinations. A Review on Methods and Results

“…The set of the listed Eqs. ( 72) to (75) allows to investigate the distribution of mechanical stresses in a spherical layer with a wedge disclination that was demonstrated on the example of stress maps in Ref. [48].…”

“…In the 1970-80s this phenomenon was analyzed in detail for metals subjected to large plastic deformations, where it got the namefragmentation [55]. It was argued that partial wedge disclinations play a crucial role in fragmentation initiation [55,56,[70][71][72][73][74][75].…”

“…Junction disclinations were recognized to be responsible for the initiation of fragmentation in polycrystals [55][56][57][58][70][71][72][73][74][75][111][112][113] and for grain refinement for achieving nanoscale grain size in the course of severe plastic deformation [59,[114][115][116][117]. In the previous Section we have already mentioned the role of disclinations in controlling mechanical properties of nanocrystalline materials [59,[84][85][86][87][88][89][90]; here we can only note that disclinations there are at most junction located defects.…”

Analysis of Local Fields of Elastic Stress Generated by Rotational-Shear Mesodefects Near the Junctions of Grains

“…Ïðè ýòîì èññëåäóåòñÿ ýâîëþöèÿ àíñàìáëÿ âçàèìîäåéñòâóþùèõ ìåaeäó ñîáîé, à òàêaeå ñ ïîëÿìè âíåøíèõ è âíóòðåííèõ íàïðÿaeåíèé îò ìåçîäåôåêòîâ ðåøåòî÷íûõ äèñëîêàöèé, îñóùåñòâëÿþùèõ ïëàñòè÷åñêóþ äåôîðìàöèþ â ïðèãðàíè÷íîé çîíå çåðíà. Êàê ïðàâèëî, ïðè ðàññìîòðåíèè òàêèõ ïðîöåññîâ, êàê ôîðìèðîâàíèå îáîðâàííûõ äèñëîêàöèîííûõ ãðàíèö [13][14][15] èëè çàðîaeäåíèå ìèêðîòðåùèí [16][17][18], îãðàíè÷èâàþòñÿ ïðîñòåéøèì ñëó÷àåì îäèíî÷íîé ñòûêîâîé äèñêëèíàöèè èëè îäèíî÷íîãî äèïîëÿ äèñêëèíàöèé, êîòîðûå ëèøü ïðèáëèaeåííî ìîäåëèðóþò ïîëÿ âíóòðåííèõ íàïðÿaeåíèé âáëèçè ñòûêà.…”