Which mechanism causes increased dislocation mobility near boundaries grains in polycrystalline alloys?

💡 Explanation

Increased thermal vibration reduces the Peierls stress reduction near grain boundaries, because dislocation movement becomes thermally activated, therefore decreasing the energy needed to overcome lattice resistance and move dislocations rather than dislocation pinning that would increase force needed..

• Which risk increases when a ferromagnetic core inductor undergoes saturation?
• Which mechanism increases when photons pass a black hole?
• Which mechanism increases brittleness when specific polymers are exposed to ultraviolet radiation?
• Which consequence unfolds within a solid-oxide fuel cell (SOFC) electrolyte when local oxygen depletion diminishes ionic conductivity?
• Which mechanism limits capacitance when parallel-plate capacitor dielectric nears breakdown field strength?
• Which risk arises when rapid quenching during steel manufacturing incompletely resolves austenite within the work piece?