Practical 1 Assignment Example | Topics and Well Written Essays - 250 words

Practical 1 - Assignment Example Annealing process effects on mechanical properties of the sample’s test strain properties. The material loses its ductility during the cold rolling process. Anneal strengthening effect or toughness of the material under investigation (copper) increases in degree of prior cold work and the corresponding annealing. The ability of crystalline material to plastically deform depends on the ability for dislocation movement within copper. When the movement of dislocations is impeded, the material is strengthened. This is achieved through a number of ways such as; Strain hardening or work-hardening or cold working is a process that makes copper harder and stronger through plastic deformation. As it is plastically deformed, dislocations move as additional dislocations are produced. As dislocation within the material increases, the grains interact and become pinned or tangled. As a result, there is decreased grain mobility of dislocations as the material is strengthened. Ductility increases with the grain size, as the strength decreases. Atomic diffusion occurs as temperature increases and it releases internal strain energy. Since atoms are not fixed in a position but move once they have enough energy to break their bonds, diffusion increases rapidly with the increase in temperature. This allows the atoms to move to unrestrained positions and recover a normal position in lattice structure. This is the recovery phase and leads to adjustment of strain. In the annealing process, the test sample was performed in 1000Â ºC capacity furnace. It was observed that the hardness of the copper sample increased with gradual increase in reduction in cross-sectional area. This is due to strain hardening. The maximum value of hardness was obtained at 117HB 40% reduction in area. Understanding of mechanical deformation properties ensures efficient stress relieving procedures. Thickness of material affects the hardness of the material. It is observed from the experiment that