CU-AL-MN-BASED SHAPE-MEMORY ALLOY MOLDED ARTICLE AND METHOD FOR PRODUCING SAME

摘要

A formed body of Cu-Al-Mn-based shape-memory alloy according to the present invention comprises a screw portion, wherein the screw portion is a form-rolled portion. A method for producing a formed body of Cu-Al-Mn-based shape-memory alloy according to the present invention comprises a step forming a screw portion having superelasticity by plastically working at least a portion of a material for the formed body with form-rolling in a state that a crystal structure is an A2-type structure and then, subjecting heat-treatment so as to convert the A2-type crystal structure into an L21-type crystal structure. The screw portion can be formed with good working property, and has excellent fatigue resistance property and breaking resistance property.