Does a material which work hardens a lot has a stress strain curve with a steep gradient in the plastic region?

Or is it the elastic region?Does a material which work hardens a lot has a stress strain curve with a steep gradient in the plastic region?
A stiff material (like carbon fiber) has a steep gradient in the elastic region. The slope of the elastic region is, in fact, called the material's stiffness.





A work-hardening material has a (relatively) steep gradient in the plastic region of the stress-strain curve.

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