Method for manufacturing plastic worked article

A method for manufacturing a plastic worked article by plastic working an article for plastic working, comprising the steps of:

• shaping an article for plastic working by a semisolid molding in which molten metal including both a solid phase and a liquid phase is introduced into a die;
• performing a pre-plastic working heat treatment on the article for plastic working for causing blisters by expanding gas cavities included in the article for plastic working;
• and
• forming a plastic worked article by plastic working the article for plastic working after the pre-plastic working heat treatment,
• wherein the plastic working of the article for plastic working is performed in such a manner that a tensile stress applied direction at a tensile stress applied portion to which tensile stress is principally applied in actual use of the plastic worked article substantially accords with a plastic flow direction at a portion of the article for plastic working corresponding to the tensile stress applied portion.