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AssigneeJapan Science and Technology Agency
InventorsYasubumi Furuya, Teiko Okazaki, Chihiro Saito, Masaki Yokoyama, Mamoru Oomori
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[Object] A bulk material which is suitably used as a material for actuator and sensor elements is formed from a Fe—Ga base magnetoresistive alloy and a Ti—Ni base shape memory alloy taking advantage of crystal miniaturization and anisotropy as well as reduction of precipitates (equilibrium state in state diagram) and non-equilibrium phases peculiar to liquid rapidly solidified materials, and the performance of the material is enhanced by a production method thereof which has cost advantage over a melt method. [Construction] A rapidly solidified material having a particular rapidly solidified texture of a Fe—Ga magnetostrictive alloy or a TiNi-based shape-memory alloy and properties derived therefrom is formed into slices which are laminated to each other in a die, or is formed into a powder or chops which are filled in the die. Subsequently, spark plasma sintering is performed so that bonds between the slices, grains of the powder, or the chops are formed at a high density to form a bulk alloy, followed by annealing whenever necessary, so that the properties of the alloy are improved.
A rapidly solidified material consolidated into a bulk form for actuators and sensors, comprising a Fe—Ga magnetostrictive alloy which is obtained from slices, a powder or chops of a Fe—Ga alloy rapidly solidified material by spark plasma sintering, the Fe—Ga alloy rapidly solidified material having a high temperature-side disordered bcc structure and a fine columnar texture by a liquid rapid solidification method, being in a disordered to ordered transition composition range, and containing 15 to 23 atomic percent of Ga with respect to polycrystalline Fe.
A rapidly solidified material consolidated into a bulk form for actuators and sensors, comprising a TiNiCu shape-memory alloy which is obtained from slices, a powder or chops of a TiNiCu shape-memory alloy rapidly solidified material by spark plasma sintering, the TiNiCu shape-memory alloy rapidly solidified material being composed of an amorphous to nanocrystalline texture or an amorphous and nanocrystalline mixed texture by a liquid rapid solidification method.
Dependencies are inferred from the claim text.