Professor M I Dum conducted a study on the effect of grain s

Professor M. I. Dum conducted a study on the effect of grain size on the yield stress of a number of metals using thin foil specimens (thickness 0.1 mm and width 6.25 mm). He investigated grain sizes of 5, 25, 45, and 100m.

Which specimens can be considered truly polycrystalline?

Solution

As Polycrystalline Size < Crystalline < Grain < Particle

So, among the provided sizes, Grain size of 5 microns can be considerd as Truly Polycrystalline