Abstract
Effect of carbon and oxygen impurity atoms on the migration rate of tilt boundaries in fcc metals: a molecular dynamics simulation
Highlights
Grain boundary migration is the movement of the boundary along the normal to its surface
In [7, 8], we have studied the atomic mechanism of migration of tilt boundaries with the and misorientation axes, as well as their triple junctions, using the molecular dynamics method
The introduction of carbon and oxygen impurity atoms led to a significant inhibition of the migration of grain boundaries, which is obviously due to the high binding energies of impurity atoms with them
Summary
Grain boundary migration is the movement of the boundary along the normal to its surface. It is believed that low-angle tilt boundaries migrate through the combined action of two mechanisms: slip and climb of grain boundary dislocations [1]. The migration of the tilt boundary occurred as a result of the combined action of two mechanisms: the mechanism described above and the mechanism consisting in the joint slipping of pair grain-boundary dislocations, which, in contrast to grainboundary dislocations in the boundaries, have common slip planes. Another important issue is the effect on the mobility of the grain boundaries of impurities, lattice defects, free volume. Electronegativity (Pauling scale): Al — 1.61, Ag — 1.93, Ni — 1.91 [15]
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