MANUFACTURING METHOD OF IRON-BASED SHAPE MEMORY ALLOY AND IRON-BASED SHAPE MEMORY ALLOY

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of an iron-based shape memory alloy having lower cost and higher recovery strain than conventional products.SOLUTION: The manufacturing method of an iron-based shape memory alloy includes a first process of conducting plane strain compression process on a material to be proceeded containing 3 mass% to 7 mass% of Si, 15 mass% to 33 mass% of Mn and the balance Fe with inevitable impurities in a temperature range where the Si is solid dissolved in Fe to be a single phase and at strain speed where solute atom atmosphere controls movement of a transition and a crystal grain boundary can move with a strain energy of a crystal grain as a driving force and a second process for cutting the material to be proceeded on a face having 40° to 50° to an elongation direction in the plane strain compression process and parallel to a load adding direction.