Mechanical Properties Of Cu Research Articles

High temperature properties of heavily deformed Cu20%Nb and Cu20%Ta composites

Abstract The mechanical properties of Cu20%Nb and Cu20%Ta composites formed by extensive cold drawing were evaluated between 22 and 600 °C. The increased strength of Cu20%Ta over that of Cu20%Nb at the temperatures studied is attributed to the higher modulus and melting temperature of tantalum as compared with niobium. The decreases in strength of the composites up to 300 °C are relatively small and correlate with the decrease in the shear modulus of copper with temperature. Above 300 °C the decreases in strength are very pronounced and are primarily due to the coarsening of the individual filaments. The results show that the use of a filamentary metal with a high elastic modulus and melting temperature considerably improves the mechanical properties and the stability of these types of metal-metal composites at elevated temperatures.

Effect of thermo-mechanical processing on mechanical properties of copper bearing age hardenable steel plates.

The effect of thermo-mechanical treatment on the mechanical properties of Cu bearing age hardenable steels was examined. Accelerated cooling and direct quenching after controlled rolling enhanced to produce the microstructure dominant of low carbon bainite which caused the improvement of strength and toughness. Addition of Cu over 1% was effective in both ε-Cu precipitation strengthening and microstructural control through its effect on hardenability. Studies were focussed on the specific effects of Cu in thermo-mechanical process. It was revealed that the improvement of mechanical properties was partly attributed to the retardation of recrystallization in hot working due to Cu addition over 1% and the suppression of ε-Cu precipitation during cooling due to rapid cooling.

Effect of Temperature on some of the mechanical properties of Cu–10 Ni–6 Sn spinodal alloy

Tensile tests on Cu-10Ni-6Sn spinodal alloy were carried out with polycrystalline samples in as-quenched and aged conditions at various temperatures ranging from 77/sup 0/K to 353/sup 0/K. There was no marked difference in activation energy for plastic flow of as-quenched and aged specimens. The work-hardening rate and the total elongation were found to be independent of the amplitude and wavelength of the composition modulation in the spinodally-modulated structure. Deformation of the aged specimens was accommodated by coarse slip, whereas the as-quenched specimens deformed by fine slip.

Influence of γ-Fe precipitates on physical and mechanical properties of Cu–Fe alloys

AbstractThe object in this work was to investigate the influence of aging temperature and time and chemical composition on the mechanical and electrical properties of Cu–Fe alloys. Polycrystalline specimens of Cu–0·5–3Fe alloys after solution treatment at 950°C for 1h were aged at temperatures of 400°, 500°, 600°, and 700°C for times of 0·5, 1, 3, and 10h. The methods used for the investigations were: optical and electron microscopy, Mossbauer spectroscopy, electrical resistance measurements, and mechanical tests. The aging of supersaturated solid solutions of iron in copper has a great influence on the structure and properties of Cu–Fe alloys. However, a change in alloy composition does not cause a change in electrical resistance, but influences only the mechanical properties and precipitation kinetics. In the initial stage of aging there are iron clusters present, which grow with aging time into dispersive, coherent γ-Fe particles. The size of the γ-particles increases with temperature and time of aging...