Intragranular Deformation Mechanisms during Ambient-Temperature Creep in Hexagonal Close-Packed Metals

Transition of Deformation Mechanism with Grain Refinement in Interstitial-Free Steel

“…© 2014 ISIJ because GB in UFG steel has higher GB energy than that in CG steel. The absorption of dislocation activates GBS to relax intragranular strain, i.e., "slip-induced GBS", 29,30) whose amount increases with increasing GB energy. 31) Moreover, because the activation energy of the GBS was evaluated as about 20 kJ/mol, 29,31) it might activate at room temperature where diffusion processes do not activate.…”

Estimation of Grain Boundary Sliding During Ambient-Temperature Creep in Hexagonal Close-Packed Metals Using Atomic Force Microscope

“…On the other hand, the high-temperature dislocation creep possesses zero p value, which means dislocations can propagate to an adjacent grain easily. In addition, backflow is observed after complete stress-drop tests which mean that the recovery rate controls ambient-temperature creep (Matsunaga et al, 2009b). Results in the previous paper also claimed that grain boundary must accommodate piled-up dislocations to continue and to rate-control deformation because no obstacles exist against dislocation motion inside of a grain.…”

Frequency dependence of estimated fatigue limit by lock-in infrared thermography for commercially pure Ti

“…Moreover, the data sheet indicated that cyclic hardening occurs at more than a proof stress. Therefore, the phenomenon related to dislocation motion might affect the generation of dissipated energy; straightly aligned dislocation at low stress [12] and tangled dislocation at high stress. According to the discussion, the high stress amplitude leads to failure and shows the fatigue limit in a finite time because of the clearer strain accumulation comparing with the low stress amplitude.…”