Annealing effects on the microstructure and texture of a multifilamentary Cu–Nb composite wire

Effect of Annealing on the Microstructure and Properties of In-situ Cu–Nb Microcomposite Wires

“…3b, a number of small holes/pits form within Nb films after annealing at 500°C. This phenomenon is different from those of the reports [1,[32][33][34], most of whom found the boundary splitting and groove formation along the boundaries after annealing [1,35]. Sharma et al [10] presented several major models for the coarsening of Nb including direct cylinderization, edge spheroidization, termination migration, discontinuous coarsening, and boundary splitting.…”

“…The aspect ratio is defined by w/t, where w is the width of the ribbon and t is the thickness. Thus, the Nb phase exhibits a thin ribbon shape on the longitudinal section and can be treated as finite thin films, since the ratio is much higher than 10 in the work by Sandim et al [1]. Annealing at different temperatures provides different microstructures (Fig.…”

“…Cu-Nb microcomposite wires have drawn wide attention due to their good combination of high mechanical strength and electrical conductivity, thus making them be a good candidate for winding of high-field pulsed magnets [1][2][3][4][5]. Magnetoresistance (MR) is the change in resistivity of the materials induced by the interaction of magnetic field with conductive electrons in materials.…”

“…q 0 is the resistivity value at zero magnetic field. In most application conditions, the wires are exposed to Joule heating due to electrical resistance [1,8], which induces obviously changes in the microstructure and properties of Cu-Nb composite wires, such as the spheroidization and coarsening of Nb phases, the decrease in the mechanical strength, and the increase in the electrical conductivity. These will affect the service life of the wires and, consequently, the magnet [9][10][11][12][13][14].…”

Study of high-strength and high-conductivity Cu–Sn–Fe alloys

“…Presently, the research of copper alloys with high strength and high electrical conductivity is concentrated on Cu-Ag [6][7][8], Cu-Nb [9,10], Cu-Cr [11][12][13][14][15][16][17], Cu-Fe [18][19][20][21], Cu-Mg [22] and Cu-Mn [23] series. However, all these alloys have their own shortcomings, such as high cost, feeding difficulty and low conductivity.…”