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It is an alloy that, even if is transformed at room temperature, it starts returning to its former shape when heating it beyond a certain temperature or transformation point. Our company develops the usage of ferrous shape memory alloys, though titanium and the nickel shape memory alloys invented in Japan are also well known.

It is applied to couplings for the end part of a curved pipe in tunnel construction and joint bars for crane rails.

representative elements (mass%)

Fe - 32Mn - 6Si Fe - 28Mn - 6Si - 5Cr Fe - 20Mn - 5Si - 8Cr - 5Ni Fe - 16Mn - 5Si - 12Cr - 5Ni

In a ferrous shape memory alloy, when the transformation is added in the state of "Austenite phase" that is the parent phase, it gives priority more to "Slipping transformation" and the change in the crystal "Stress-induced martensitic transformation" is caused for a usual metal.

In "Slipping transformation" the crystal cannot be returned to former shape, and when "Martensite aspect" is returned to "Austenite phase" that is the parent phase by heating to a suitable temperature (more than transformation point), it is possible to restore to the original shape, when transformed by "Stress-induced martensitic transformation".