or [7 marks] The use of age hardening and grain size strengthening is common for some materials but not a lot mentioned the idea of its effect on strain hardening rate, i.e. () () in the uniform plastic deformation regime. Explain, to an audience of second years undergraduate students, how the strain hardening rate is affected by these two strengthening methods. For grain size strengthening, consider the case of a very large grain size, typical grain size, and very small grain size and compare it to the case of a single crystal. For age hardening, consider a number of stage with the solutionized stage, GP zone formation, coherent particles, semi-coherent particles, incoherent particles, in comparison to the case of a fully anneal sample