Question: Second phase particles in a crystal lattice can act as pinning sites for dislocations. ( a ) Explain IF and WHY the macroscopic yield strength

Second phase particles in a crystal lattice can act as pinning sites for dislocations.
(a) Explain IF and WHY the macroscopic yield strength will be higher for a material with:
a large number of closely spaced small particles
OR a small number of widely spaced, large particles.
Please be as quantitative as possible with your answer
( ie. include the equation in your explanation).

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