Experimental method for true in situ measurements of shear-coupled grain boundary migration

Thermally activated flow in soft and hard regions: Getting information on work hardening strain and recovery strain from rate change tests

“…This is necessary on a more or less local scale for recombination of boundaries via migration of Y-junctions to keep the dynamic balance of formation of new and disappearance of old boundaries in the stationary state. The strain effect connected with boundary migration is directly seen from tilting of the outer surface of those crystal volumes swept by migrating boundaries [11][12][13]; the surface tilts are the result of local shearing of the crystal lattice in the direction prescribed by the acting stress ('migration-shear coupling').…”

A coupling crack blunting mechanism in nanocrystalline materials by nano-grain rotation and shear-coupled migration of grain boundaries

“…However, recent experiments showed that the stress-driven nanograin growth (NGG) process was a promising deformation mode that could help scientists to circumvent the strength-ductility trade off in NC materials [1][2][3]. Two general NGG modes have been identified by various researchers, i.e., nano-grain rotation (NGR) and shear-coupled migration (SCM) of grain boundaries [4][5][6][7][8][9][10][11]. Moreover, as demonstrated by many experiments and molecular dynamics as well as mesoscale simulations [4,12,13], NGG and SCM usually appear concomitantly.…”

Cooperative toughening mechanism of nanocrystalline materials by grain rotation and shear-coupled migration of grain boundaries

“…Extensive experimental and theoretical studies as well as many molecular dynamics (MD) simulations have shown that shearcoupled migration (SCM) of grain boundaries (GBs) and nanograin rotation (NGR) are two main modes of nano-grain growth behavior in both bicrystals and nano-polycrystallines [4][5][6][7][8][9][10][11]. For example, the MD and phase field crystal simulations studies of Trautt et al have clearly shown that SCM exists for both symmetrical and asymmetrical GBs [7].…”