subgrain

subgrain

[′səb‚grān]
(metallurgy)
The portion of a metal crystal or grain with an orientation that differs slightly from the orientation of neighboring portions of the same crystal.
References in periodicals archive ?
primarily by the long-range elastic stresses associated with the dislocation and subgrain structure that was formed during plastic deformation.
The fitting procedures have led to the following nonlinear functional interrelationship between the alloy grain, subgrain, and substructure size (GS, SGS, and SSS, respectively), as a dependent variable, and N and P, as influential independent variables.
Throughout the profile, the quartz grains show no undulose extinction or subgrain development.
According to misori-entation distribution maps and subgrain rotation behaviors, the reliability of mixed solder joints was much poorer than that of Pb-free solder joints.
In some cases, the crystal is affected by disadvantageous growth conditions, which may lead to subgrain tilting and boundary elimination and yield high-angle boundaries between subgrains.
Since crystals record changes occurring in the environment in which they grow (e.g., [7,11-15]), isotopic investigations at grain and subgrain scales on rock-forming minerals provide information on mineral-whole rock equilibria that constrain the magmatic processes occurring during magma evolution (e.g., mixing, mingling, crystals recycling, crustal contamination, or metasomatism).
The high concentration of the nonequilibrium defects (dislocations and subgrain boundaries) that are induced by plastic deformation may decrease the activation energy of diffusion and act as fast atomic transfer channels as well.
The rocks present undulose extinction, deformation twinning, and evidence of dynamic recrystallization processes, including grain boundary migration, subgrain rotation recrystallization in quartz and plagioclase, and stylolitic surfaces in calcite.