Bulk metallic glasses for industrial products; New structural and functional applications
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Bulk metallic glasses for industrial products; New structural and functional applications Nobuyuki Nishiyama1, Kenji Amiya1 and Akihisa Inoue1,2 1 RIMCOF Tohoku Univ. Lab., R&D Institute of Metals and Composites for Future Industries, Sendai 980-8577, Japan 2 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan ABSTRACT By use of excellent properties of bulk metallic glasses, some industrial products were practically prepared and their performances were investigated. Linear actuator constructed by a set of Fe-based BMG yokes generates large Lorentz force due to the large permeability and saturation magnetization of the BMG. Ni-based BMG microgear prepared by injection casting exhibits nano-imprintability against the surface roughness of mold. The newly developed alloy with a nominal atomic composition of Ti52Cu23Ni11Mo7Fe7 exhibits high yield strength of 1250 MPa, high fracture strength of 2740 MPa and large plastic elongation of over 20 %. These results for the industrial products made of BMGs are promising for future developments as industrial materials with high performance. INTRODUCTION Due to global problems of fossil fuel saving, environmental pollution and recycling pressure, materials for industrial parts are now strongly required to have higher performances. In addition, near-net or net forming processes for the parts production become also important on the point of energy saving. In such circumstances, much attention has been focused on bulk metallic glasses (BMGs) because of their unique properties for new industrial materials. It is well known that BMGs exhibit excellent properties such as ultra-high strength, large elastic elongation, high corrosion resistance, good soft-magnetic properties, net shape forming and viscous deformability, due to their unique structures of dense and random atomic configurations. At present, many bulk glass-forming systems [1] such as La-, Mg-, Zr-, Pd-, Fe-, Ni- and Cu-based alloys have been reported and these excellent properties have been also clarified. These finding of new bulk glass-forming systems widely open the way for applying the BMGs to new industrial products with high performance. This paper intends to introduce new functional and structural applications of BMGs for actual industrial parts. The performances of several products made of BMGs are also discussed in comparison with those of conventional materials. EXPERIMENTAL PROCEDURE Ingots with nominal atomic compositions of (Fe0.6Co0.4)72Si4B20Nb4 for magnetic yoke, Ni53Nb20Ti10Zr8Co6Cu3 [2] for production of microgear, and Ti52Cu23Ni11Mo7Fe7 for high strength Ti-based alloy were prepared by arc melting the mixtures of pure elements (above 99.9 mass% purity) under a purified Ar atmosphere. Fe-based glassy plates were prepared by a squeeze casting method [3]. After surface polishing and machining, the plates were used for the magnetic yoke of linear actuator. Moving coil type linear actuator was constructed with a permanent magnet, drive circuit and power source. The actuator was
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