Why does grain boundary strenghening dominate? Why not the other processes? Expl

Question

Why does grain boundary strenghening dominate? Why not the other processes? Explain in detail

Atomic Percent Tin 10 20 100 1000 96 L93C 800 25 C 600(Ag) 480C 231.9681 96.4 10 20 30 70 90 100 Ag Weight Percent Tin Sn Question 28 Which statement about the dominant hardening mechanism in pure Ag is correct? In recrystallized Ag work-hardening dominates In recrystallized Ag grain boundary strengthening dominates In Ag which is deformed and then heated to 800°C for 2 hours work-hardening dominates Solid solution hardening dominates

Explanation / Answer

The main principle behind the grain boundary strengthening is that it is difficult for the disocations to move through the grain boundaries. The dislocations that moves through the grains will get locked or piled up at the grain boundaries. So by changing the size of the grains, the strength of the material can be varied. Higher strength can be obtained in smaller grain size.

The parameters affecting the grain boundary strengthening are grain size, orientation of grains, effect of heat treatment and solidication rate.

The presence of dislocations cause the strength of materials to decrease. The strengthening mechanisms are used to arrest or stop the dislocation movements such that it can impart higher strength to the material. Thus, other processes are not used.

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