Production of Zr-based Amorphous Wires by Rotating Disk Casting Method

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Production of Zr-based Amorphous Wires by Rotating Disk Casting Method Tao Zhang and Akihisa Inoue Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan ABSTRACT Continuous amorphous wires with high strength and good ductility have been produced for the Zr55Al10Ni5Cu30 and Zr55Ti5Al10Ni10Cu20 alloys by a rotating disk casting technique. The rotating disk, which is made of copper, has a semicircular groove on its upside surface. The amorphous wires have a nearly circular cross-section, smooth peripheral surfaces and diameters in the range from 0.5 to 1.5mm. The amorphous alloy wires have good bending ductility. The maximum tensile strength, σf, is 1600 MPa for Zr55Al10Ni5Cu30 amorphous wire and 1900 MPa for Zr55Ti5Al10Ni10Cu20 amorphous wire, respectively. The success of forming amorphous alloy wires in a continuously long form by the present casting method is important for the further extension of application fields of amorphous alloys. INTRODUCTION Amorphous alloy wires in diameter from 0.1 to 0.2 mm with a circular cross-section and long length have been produced in various of amorphous forming alloys by the in-rotating-water melt spinning method[1-3], glass-coating spinning method (Taylor method)[4], and melt extraction method[5-8]. However, the diameter of the amorphous wires produced by these conventional methods has been limited to be less than 0.2 mm. No data on the formation of amorphous alloy wires with a diameter in the range of 0.2-1.5 mm in a continuously long form with good ductility and no corresponding effective production method have been reported. Recently, new multicomponent alloy systems such as Pd-Cu-Si[9], Ln-Al-TM[10], Zr-Al-TM[11], Mg-Ln-TM[12], Zr-(Ti, Nb, Pd)-Al-TM[13], Fe-(Al, Ga)-(P, C, B, Si) [14], Pd-Cu-Ni-P[15] and (Fe, Co, Ni)-(Zr, Hf, Nb)-B[16] (Ln = Lanthanide metals, TM = transition metals) with high glass-forming ability have been found and the bulk amorphous alloys in rod and sheet forms with a thickness from 1 to 80 mm have been produced in these new alloy systems by copper mold casting, arc melting and suction casting etc.. It is expected to produce amorphous wires with a diameter from 0.2 mm to 1.5 mm in these bulk amorphous alloy system for the further extension of application fields of amorphous alloys. More recently, we have successfully developed a rotating disk casting method, which enables the production of continuous amorphous alloy wires with diameters from 0.5 to 1.5 mm by using Zr55Al10Ni5Cu30 and Zr55Ti5Al10Ni10Cu20 alloys with high glass-forming ability. This paper is intended to present the formation conditions of these amorphous alloy wires for the rotating disk casting method and the morphology, thermal stability and mechanical properties of the resulting amorphous alloy wires. EXPERIMENTAL PROCEDURE The alloy ingots with nominal compositions of Zr55Al10Ni5Cu30 and Zr55Ti5Al10Ni10 Cu20 (at%) were prepared by arc melting of pure Zr, Ti, Al, Ni and Cu metals in an argon atmosphere. L12.24.1

Figure 1 shows the schematic illustration of a rota