Need to understand reasoning behind the answer so please inc

Need to understand reasoning behind the answer so please include, thank you!

Structure-property relationships: For the following changes in structure indicate the accompanying change in mechanical property by circling the appropriate symbol: uparrow (increases), downarrow (decreases), - (does not change). Reducing grain size uparrow downarrow - a materials hardness. Increasing dislocation density uparrow downarrow - a materials shear modulus. Increasing the mean stress during cyclic loading uparrow downarrow - the endurance limit. Reducing grain size uparrow downarrow - a materials resistance to diffusional creep. Increasing the Young\'s modulus of the reinforcing fiber in a fiber composite uparrow downarrow - the fraction of load carried by the reinforcing phase.

Solution

Solution 2.1

Answer : Reducing grain size will decrease the material hardness

Solution 2.2

               increasing dislocation density – Increase material shear modulus

Solution 2.3

           Increasing the mean stress of during cyclic loading – increase endurance limit

Solution 2.4

          Reducing the grain size – decrease material resistance to diffusional creep