Abstract
An austenitic shape memory alloy containing about 30 wt.% Mn and an appropriate amount of silicon has been developed. It is a cost-saving alloy and can be used for practical applications. When the strain is less than approximately 5%, the alloy exhibits a complete shape memory effect (SME) of one-way type. Contrary to most shape memory alloys which have ordered structures, the FeMnSi alloy without an ordered structure has a hysteresis as large as 500 K. SME of the alloy originates in the f.c.c.⇄h.c.p. martensitic transformation. The macroscopic properties and microscopic mechanisms involved in the martensitic transformation are reviewed.
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