Microstructure and mechanical properties of powder-injection-molded products of Cu-based amorphous powders and Fe-based metamorphic powders

Structure and properties of composites prepared from partially amorphous ZrCuNiTi and nanocrystalline silver

“…The plastic deformation is slightly higher near 3% and the deformation curve is more smooth for the composite containing 50% Ag, indicating less crack formation and more plastic deformation within the silver part. The compression strength is much lower than reported for the cast amorphous alloys [5][6][7]11,12], however much higher than that for a pure silver. Therefore one can expect that they may be useful for electrical contacts where a high strength and a good conductivity assured by a high content of a pure silver is required.…”

“…The alloys from the quaternary CuTiZrNi system show a very good glass forming ability manifested by high values of T rg = T g /T l above 0.6 [2,3,[5][6][7][8][9][10]. Cast bulk quaternary CuTiZrNi amorphous alloys show also a very good mechanical properties with a compressive fracture strength above 2 GPa [4][5][6]11,12], with a positive effect of fine crystalline particles [11]. Among amorphous quaternary and multicomponent alloys some are based on Cu-Ti system [2,3,[6][7][8]11,12] and the other on Cu-Zr system [4,7] either with Ni, Ti or Al additions.…”

“…Cast bulk quaternary CuTiZrNi amorphous alloys show also a very good mechanical properties with a compressive fracture strength above 2 GPa [4][5][6]11,12], with a positive effect of fine crystalline particles [11]. Among amorphous quaternary and multicomponent alloys some are based on Cu-Ti system [2,3,[6][7][8]11,12] and the other on Cu-Zr system [4,7] either with Ni, Ti or Al additions. Atomized CuTiZrNiSnSi powders were obtained amorphous [12], however sintered already at 470 • C, completely crystallized.…”

“…Among amorphous quaternary and multicomponent alloys some are based on Cu-Ti system [2,3,[6][7][8]11,12] and the other on Cu-Zr system [4,7] either with Ni, Ti or Al additions. Atomized CuTiZrNiSnSi powders were obtained amorphous [12], however sintered already at 470 • C, completely crystallized. On the other hand spark plasma sintered amorphous CuZrNiTi and Ni base atomized powders have shown a very good mechanical properties [13].…”

“…Therefore in the present paper two compositions of Zr-Cu-Ni-Ti alloy based on Cu-Zr system (less explored than that based on the Cu-Ti system) were chosen to produce amorphous structure either by melt spinning or by ball milling, followed by hot pressing with addition of Ag nanocrystalline powder to produce amorphouscrystalline composite. The crystallization effects were compared in ball milled and melt spun amorphous alloys as the literature results concerning crystallizing phases in quaternary CuZrTiNi alloy system are not consistent [1][2][3][4][5][6][7][8][9][10][11][12]. The silver addition was chosen to improve ductility and electrical conductivity of composites as in [8,10] which might be useful as electrical contacts materials and to improve glass forming ability [15] in a transition interface regions, where silver is expected to diffuse into amorphous phase.…”