Abstract:
The present invention employs an optimized cross-sectional shape for a ferromagnetic shape memory alloy (FSMA) composite that is used in a spring-type actuator, an improved hybrid magnetic trigger for use in FSMA based actuators, an a FSMA composite based spring type actuator, an a FSMA based spring type actuator including a stack of triggering units and FSMA springs, a FSMA composite based torque actuator. The invention also includes a model that can be employed to evaluate different materials being considered as components a FSMA for a FSMA composite used in either a FSMA based torque actuator or a FSMA spring actuator.
Abstract:
This invention is a magnetostriction transducer (26) including a plurality of magnetostriction laminates (28) each having a first end (30) and a second end (32). The first (30), and second (32) ends of the laminates (28) include openings (38, 40). The laminates (28) are arranged in a stacked configuration, bonded together by solder (34, 36) at the first (30), and second (32) ends. At the first (30), and second ends (32) the solder extends through the openings (34, 38) of the laminates (28) forming a solder bar (34, 36) therein. The solder bars (34, 36) bond the laminates (28) together with increased mechanical strength, and also provide increased electrical contact between the laminates (28).
Abstract:
The invention relates to devices that produce displacements and/or forces (defined as actuators), when a magnetic field source(s) is (are) placed in such a way that the resulting magnetic field is of suitable strength and orientation in relation to the actuating element made from a Magneto-Mechanical Adaptive (MMA) material, so as to produce the desired displacement of the MMA element; or to devices that dampen mechanical vibrations by absorbing the vibration energy into an MMA element and/or by converting the vibration energy into electric power in the device and/or senses displacement velocity or acceleration. The electric energy can be dissipated to heat or led out from the device. In the latter case, the device works as a power generator. The principle of using the devices as sensors is also described. The MMA material here is defined as a material whose dimensions change when a magnetic field or stress is applied to it, based on twin boundary or austenite-martensite phase boundary motion or magnetostriction.
Abstract:
A method for producing an RE-containing alloy represented by formula R(T1- xAx)13-y (wherein R represents Ce, etc.; T represents Fe, etc.; and A represents Al, etc; 0.05≤x≤0.2; and -1≤y≤1) including a melting step of melting alloy raw materials at 1,200 to 1,800°C; and a solidification step of rapidly quenching the molten metal produced through the above step, to thereby form the first RE-containing alloy, wherein the solidification step is performed at a cooling rate of 102 to 104°C/second, as measured at least within a range of the temperature of the molten metal to 900°C; and an RE-containing alloy, which is represented by a compositional formula of RrTtAa (wherein R and A represent the same meaning as above, T represents Fe, etc.; 5.0 at.% ≤r≤6.8 at.%, 73.8 at.% ≤t≤88.7 at.%, and 4.6 at.% ≤a≤19.4 at.%) and has an alloy microstructure containing an NaZn13-type crystal structure in an amount of at least 85 mass% and α-Fe in an amount of 5-15 mass% inclusive.
Abstract:
The present invention provides a supermagnetostrictive alloy capable of providing a larger shift (lager magnetostriction) with excellent workability, which is applicable to an actuator in response to advances in downsizing of electronic devices and upgrading of medical instruments and production apparatuses. The supermagnetostrictive alloy has a degree of order of 0.6 to 0.95 achieved by subjecting Fe3-x Pt 1+x (- 0.02
Abstract:
A method for manufacturing a sintered compact includes the steps of preparing an alloy powder having a composition represented by Expression 1: RT w (where, R is at least one kind of rare earth metal, T is at least one kind of transition metal, and w defines a relation of 1
Abstract:
By compacting in a magnetic field a mixture containing powder raw material A having a composition represented by (Tb x Dy 1-x )T y wherein T is at least one metal of Fe, Co, and Ni and 0.30 1-t Tb t ) z T 1-z wherein 0 ≦ t ≦ 0.30 and 0.40 ≦ z ≦ 0.80 and optionally, powder raw material C consisting essentially of element T, and sintering the compact, there is prepared a magnetostrictive material having a composition represented by (Tb v Dy 1-v )T w wherein 0.27 ≦ v
Abstract:
Magnetostrictive alloys are composed basically of Tb-Dy-iron which is partially substituted by at least one element selected from the group consisting of Y, La, Ce, Pr, Nd and Sm, and have been grown in the direction of face index 〈110〉 or contain Mn and M' element (at least one element selected from the group consisting of C, Mg, Al, Si, Ca, Zr, Y, Ga and B.) The magnetostrictive alloy may be formed by melting the constituent materials by high frequency induction dissolution. The molten materials are cast in a heated mould having a temperature gradient. The solidified material may be further treated by hot working.
Abstract:
A super-magnetostrictive alloy has a high coefficient of magnetostriction and satisfactory toughness. The first type of the super-magnetostrictive alloy has a composition whose atomic ratio is expressed by (Tb x Dy 1-x (Fe 1-y Mn y ) z where 0.35 ≦ x ≦ 0.9, 0.001 ≦ y ≦ 0.6. and 1.4 ≦ z ≦ 2.1. The second type of the super-magnetostrictive alloy has a composition whose atomic ratio is expressed by (Tb x Dy 1-x (Fe 1-y-w Mn y T w ) z , where 0.2 ≦ x ≦ 0.9, 0.05 ≦ y ≦ 0.4, 0.05 ≦ w ≦ 0.1, and 1.4 ≦ z ≦ 2.1, and where T is at least one of Co and Ni. The super-magnetostrictive alloys of both types have a Laves-type intermetallic compound phase as a main phase, and a rare earth metal phase is located between the portions having the main phase.