Fabrication and Characterization of Melt-Extracted Co-Based Amorphous Wires

Abstract

Amorphous Co 68.15 Fe 4.35 Si 12.25 B 15.25 wires with smooth surface and circular cross section were fabricated by melt extraction technology using a copper wheel with a knife-edge cross section angle of 60 deg. The effect of some process parameters such as wheel circumference velocity, molten alloy feed rate, and temperature on the geometry and weight, i.e., melt extracted layer thickness, of wire was examined carefully. An optimum process parameter to produce highquality circular wires was presented. A high resolution CCD video camera recorder was used to monitor the changing of the surface shape of molten alloy contacting the wheel tip under different conditions. It was found that the mechanism of the wire formation during the optimum process condition was controlled by the momentum mechanism, while in the low wheel speed region, heat transfer turned out to be a dominant factor. Some characteristics of the circular wires such as amorphous nature and tensile strength were also studied.

Excellent magnetocaloric properties of melt-extracted Gd-based amorphous microwires

“…23 The composition of the wire was chosen because its bulk glass counterpart was reported to show excellent magnetocaloric properties. 5 A fabrication process of the wires can be described as follows: The ingot with a diameter of 8 mm was prepared from raw materials Gd, Al, Co, and Zr crystals in argon atmosphere by arc melting.…”

Tensile Strength Reliability Analysis of Cu48Zr48Al4 Amorphous Microwires

“…The parameter of constant linear velocity of the wheel rim was 30 m·s −1 . The feeding rate of the molten rod was 10-15 m·s −1 [19]. Macro and micro morphologies of melt-extracted wires with uniform, smooth, and rounding surfaces were shown in Figure 1.…”

Tensile Properties and Fracture Reliability of Melt-extracted Gd-rich Amorphous Wires

“…Finally, the melt was extracted by a copper wheel with a diameter of 320 mm and 60º knife-edge and the wires were formed under their surface tension and natural gravity. [13] . The melt-extracted process and the morphology of fabricated wires with high-quality are schematically shown in Figure 1.…”