Abstract: The present invention provides a thermomechanical treatment means for a Fe—Mn—Si-based shape memory alloy having specified components with Nb, C addition with simple deformation prior to aging. Such deformation treatment prior to aging is carried out in the inventions of the prior applications in a temperature range of from 500° C. to 800° C. According to the present invention, however, the deformation treatment prior to the aging treatment can be successfully carried out not at high temperature but at room temperature, if the deformation ratio is in a specified range. The technical meaning of the present invention must be clearly understood as compared to the prior art and the inventions of the prior applications because the present invention allows the treatment at room temperature while the others require troublesome treatment at high temperature so that there is significant difference therebetween.

Abstract: To provide a very tough material at a low manufacturing cost, the present invention provides an alloy-based nano-crystal texture in which, in an alloy system having a composition deviating from the stoichiometric composition, and capable of forming an amorphous state, nano-scale crystals are arranged in an identical crystal orientation.

Abstract: A NbC-added Fe—Mn—Si-based shape memory alloy is provided, showing a shape memory property even if a special treatment such as training is not performed. A Fe—Mn—Si-based shape memory alloy containing Nb and C is rolled by 10 to 30% in a temperature range of 500 to 800° C. under austenite condition, then, subjected to an aging treatment by heating in a temperature range of 400 to 1000° C. for 1 minute to 2 hours.

Abstract: To remarkably improve shape-memory properties without the need for strictly controlling the composition, the present invention provides a Ti—Ni-based shape-memory alloy having a titanium content within a range of from 50 to 55 atomic %, which comprises an amorphous alloy heat-treated at a temperature of from 600 to 800 K, in which subnanometric precipitates generating coherent elastic strains are formed and distributed in the bcc parent phase(B2).

Abstract: A NbC-added Fe—Mn—Si-based shape memory alloy is provided, showing a shape memory property even if a special treatment such as training is not performed.

Abstract: To provide a very tough material at a low manufacturing cost, the present invention provides an alloy-based nano-crystal texture in which, in an alloy system having a composition deviating from the stoichiometric composition, and capable of forming an amorphous state, nano-scale crystals are arranged in an identical crystal orientation.

Abstract: To remarkably improve shape-memory properties without the need for strictly controlling the composition, the present invention provides a Ti—Ni-based shape-memory alloy having a titanium content within a range of from 50 to 55 atomic %, which comprises an amorphous alloy heat-treated at a temperature of from 600 to 800 K, in which subnanometric precipitates generating coherent elastic strains are formed and distributed in the bcc parent phase(B2).

Abstract: A novel shape memory alloy of Fe—Mn—Si system containing at least Fe, Mn, and Si wherein the alloy contains niobium carbide in the structure and is improved in that a sufficiently satisfactory shape memory effect is provided without carrying out a special treatment termed training.

Abstract: A novel shape memory alloy of Fe—Mn—Si system containing at least Fe, Mn, and Si wherein the alloy contains niobium carbide in the structure and is improved in that a sufficiently satisfactory shape memory effect is provided without carrying out a special treatment termed training.

Abstract: To remarkably improve shape-memory properties without the need for strictly controlling the composition, the present invention provides a Ti—Ni-based shape-memory alloy having a titanium content within a range of from 50 to 55 atomic %, which comprises an amorphous alloy heat-treated at a temperature of from 600 to 800 K, in which subnanometric precipitates generating coherent elastic strains are formed and distributed in the bcc parent phase(B2).

Abstract: To remarkably improve shape memory properties without the need for strictly controlling the composition, the present invention provides a Ti--Ni-based shape-memory alloy having a titanium content within a range of from 50 to 66 atomic %, which comprises an amorphous alloy heat-treated at a temperature of from 600 to 800 K., in which sub-nanometeric precipitates generating coherent elastic strains are formed and distributed in the bcc parent phase(B2).