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Just look at the graphs and pay attention to the numbers on the bottom. The numbers on the bottom is the strain which for all intents and purposes is change in length/original length. So if you have a .0002 it means there was an overall increase in length during the tensile (stretching) testing. The elastic deformation is the stress that can be applied to the material and still have it return to it's original form and shape. Plastic deformation is what occurs when you exceed a specific point and there... wow, I typed this last night and completely forgot about it.
Anyways there's a point where the material will always return to normal, anything beyond that point the material will deform and eventually break.
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