Increasing the ductility of ultrafine-grained copper alloy by introducing fine precipitates

Abstract

In the present study, we fabricated the ultra-fine grained (UFG) Cu-Cr-Zr alloy including fine second phase particles through the accumulative roll bonding (ARB) process and subsequent aging treatment. The nano-sized precipitates dispersing within the UFG matrix significantly enhanced strain hardening, resulting in the simultaneous improvement of uniform elongation and tensile strength.

Improvement in Mechanical Properties of a Cu–2.0 mass%Ni–0.5 mass%Si–0.1 mass%Zr Alloy by Combining Both Accumulative Roll-Bonding and Cryo-Rolling with Aging

“…None of the aged specimens displayed any precipitates besides ¤-Ni 2 Si precipitates, suggesting that, even after aging, all the Zr atoms dissolve in the Cu matrix. 8) {111} pole figures for 90R, ARB and 90CR were obtained using the Schulz method and a texture goniometer with Cu K ¡ radiation. The {112}©111ª rolling texture, which is a characteristic of pure Cu, was mainly observed for the three specimens.…”

Grain refinement in a Cu–Cr–Zr alloy during multidirectional forging

“…The contributions of dispersoids and grain boundaries to the reduction of electrical conductivity are the lowest among all the aforementioned defects [1,[13][14][15]. At the same time, dispersoids and grain boundaries provide an ultimate tensile strength of 600 MPa or higher through dispersion hardening and grain size strengthening [11,16]. Currently, this combination of strength and conductivity provided by the superposition of ultrafine-grained (UFG) structure, nanoscale coherent dispersoids and low-solute-content copper containing only traces of Cr and Zr is one of the best for copper and copper alloys.…”

“…The strength of copper can be significantly increased by cold working [3][4][5], grain refinement [6][7][8][9][10][11], and the precipitation of nanoscale dispersoids [2,[11][12][13][14][15]. However, strengthening leads to a pronounced decrease in the electrical conductivity, due to increase in the dislocation density, grain boundaries, dispersoids, and solutes, which increase the scattering of conducting electrons [1].…”

“…Recently, many techniques of severe plastic working, such as accumulative roll-bonding [11], equal channel angular pressing [7][8][9][10]16,17,[28][29][30][31] and high pressure torsion [31][32][33], were applied to produce UFG structure in Cu-Cr-Zr alloys. It was shown that the high pressure torsion is the most effective technique in refining the grains and producing the large fraction of nanoscale grains after relatively small strains, whereas the equal channel angular pressing leads to only a partial UFG structure even after a cumulative true strain of ε$16 [7][8][9][10]16,17,[28][29][30][31].…”

Tensile behavior of high temperature Cu-Cr-Zr alloy

“…INTRODUCTION Cu-Cr-Zr alloy, as one of the most promising functional materials, has been extensively researched in recent years [1][2][3][4]. With the combination of excellent electrical and thermal conductivity, good thermal stability at high temperature, relatively high strength, good fatigue resistance, outstanding resistance to corrosion and eas e of fabrication [5][6][7][8][9][10][11] it has been widely used in the applications such as moulds for continuous caster, heat transfer materials , diverter target materials and other important industrial parts [12][13][14][15].…”