In a ductile metal, what happens in the stress–strain curve after yield?

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Multiple Choice

In a ductile metal, what happens in the stress–strain curve after yield?

Explanation:
After yield, the metal enters the plastic region where deformation is permanent. Dislocations move and interact, causing strain hardening so the material requires higher stress to continue deforming. As strain increases, a localized neck forms, reducing cross-sectional area and driving the material toward fracture. In engineering terms, this is plastic deformation with strain hardening and eventual necking leading to failure (though true stress continues to rise until fracture).

After yield, the metal enters the plastic region where deformation is permanent. Dislocations move and interact, causing strain hardening so the material requires higher stress to continue deforming. As strain increases, a localized neck forms, reducing cross-sectional area and driving the material toward fracture. In engineering terms, this is plastic deformation with strain hardening and eventual necking leading to failure (though true stress continues to rise until fracture).

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