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← ScienceWhich outcome occurs when hydrostatic pressure closes gaps in polycrystalline metal?
A)Increased material density and elastic modulus✓
B)Enhanced thermal conductivity in composites
C)Reduced yield strength and plastic deformation
D)Greater corrosion resistance in saltwater
💡 Explanation
Increased pressure causes atomic rearrangement through plastic deformation via the mechanism of Coble creep, thus material densifies, filling lattice vacancies and grain boundary gaps because the pressure drives atoms into them, rather than creating dislocations.
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