Metal wire after being heavily loaded do not regain their lengths completely.explain why?

Beyond their elastic limit metals lose their elastic property and hence they do not regain their lengths completely.

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the reason is that after the elastic limit the metal loses some of its elasticity and hence gets a little deformed.since the strain is very large(as the metal wire is heavily loaded), hookes law is not obeyed and so the body reaches its yeild point and gets permenantly deformed. 
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