Stress-strain graph explaination?

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The stress-strain graph indicates that the material undergoes permanent deformation, as evidenced by the area of plastic deformation beyond the yield point. The gradient of the linear portion of the graph represents Young's modulus, which measures the material's stiffness. Shear modulus pertains to shear stress and strain, not directly represented in this graph. The discussion also touches on elastic hysteresis, which describes the energy loss during loading and unloading cycles. Understanding these concepts is crucial for analyzing material behavior under stress.
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http://imageshack.us/photo/my-images/812/unledylp.png/


So, A sample of material was stretched and then allowed to contract. A stress-strain graph was obtained as the above picture. Is it true that the material is permanently deformed based on the graph?

And, the gradient of the graph represents either Young's modulus or Shear modulus right? please correct me if I'm wrong.
 
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