Question

wheat grain is brittle or malleable breaks or stretches​

Answer 1

Explanation:

Here is a classic answer: the hall-patch relation describes that the yield strength of a material increases proportional to squareroot of the grain size. Hall-Patch is the only classic strengthening mechanism that DOES NOT reduce ductility. Other mechanisms like strain hardening, mix crystal or presipitation hardening reduce the ductility significantly.

For nano-grained materials the ductility can significantly increase, when the deformation behavior of the grain boundary dominates over the bulk deformation behavior ( 50 nm grain size or so).

At elevated temperatures (>60% of the melting temperature in K), when creep becomes a dominante deformation mechanism, you will find that the creep rate increases with decreaseing grain size.

As always: The details depend on you material of intere

Answer 2

Answer:

wheat grain is brittle or malleable or sretches