Rapid-solidified Magnetostrictive Polycrystalline Strong-Textured Galfenol (Fe-Ga) Alloy and its Applications for Micro
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1129-V01-03
Rapid-solidified Magnetostrictive Polycrystalline Strong-Textured Galfenol (Fe-Ga) Alloy and its Applications for Micro Gas-valve Chihiro Saito 1, Masamune Tanaka2, Teiko Okazaki 3 and Yasubumi Furuya 4, 1
NJC Research Center, Namiki Precision Jewel Co.,Ltd, Shinden 3-chome, Adachi-ku, Tokyo, Japan 123-8511 2 Graduate Student, Hirosaki University, 3 Bunkyo-cho,Hirosaki, Japan 036-8561, 3 Physical Science, Hirosaki University, 3 Bunkyo-cho,Hirosaki, Japan 036-8561, 4 Intelligent Machines and System Engineering, Hirosaki University, Hirosaki, Japan 036-8561.
ABSTRACT The melt-spun, rapid solidified Galfenol (Fe-Gax, (17≤x≤19)) ribbon sample showed a clear angular dependency on magnetostriction and large magnetostriction (180-200ppm) and good ductility, higher strength etc..as compared with conventional bulk sample. This large magnetostriction is caused by non-precipitating of the ordered phases the release of considerable large internal stresses in as-spun ribbon as well as the remained [100] oriented strong textures after annealing. These are worthy for engineering application as a actuator/sensor devices, therefore, we will introduce the micro-valve which was designed as a device for micro gas-flow control. Bimorph-type FeGa/Ni with the opposite value (FeGa(+),Ni(-)) of magnetostriction coefficient. Large displacement of opposite type could be obtained and it degree and hysteresis curve changed depending the volume fraction of the composite actuator structure. INTRODUCTION Magnetostrictive materials are ideally required to have high strength, good ductility, large magnetostriction at low saturation magnetic field, high magnetomechanical coupling coefficients and low cost for engineering applications as shown in Fig.1 .Rare-earth intermetallic compound, Terfenol-D single crystal exhibits giant magnetostriction ε=2000 ppm at room temperature. However, Terfenol-D single crystal is expensive and brittle to be worked. Recently, magnetic, magnetostrictive and elastic properties of so-called GALFENOL,, Fe100-xGax (13≤x≤35) single crystals were studied by A. E. Clark et al., and they found that the Fe100-xGax (17≤x≤19) single crystal showed good durability, high ductility and large magnetostriction of 400 ppm (10-6) in low magnetic field [1]-[3]. But, this alloy’s saturation magnetostriction decreased at higher composition of gallium (19
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