Abstract Aiming at the problem of damage evolution pure copper during plastic deformation, normalized shape factor is introduced based on RO model (Ramberg-Osgood model). The mesoscopic constitutive different annealing temperatures established and tensile deformation industrial analyzed. results show that error between calculated value experimental model, factor, temperatures, less than 10%. ca...

We report the synthesis and characterisation of a new family of copper(i) metal precursors based around alkoxy-N,N'-di-alkyl-ureate ligands, and their subsequent application in the production of pure copper thin films. The molecular structure of the complexes bis-copper(i)(methoxy-N,N'-di-isopropylureate) (1) and bis-copper(i)(methoxy-N,N'-di-cyclohexylureate)(5) are described, as determined by...

Room temperature ferromagnetism (RTF) is observed in pure copper oxide (CuO) nanoparticles which were prepared by precipitation method with the post-annealing in air without any ferromagnetic dopant. X-ray photoelectron spectroscopy (XPS) result indicates that the mixture valence states of Cu1+ and Cu2+ ions exist at the surface of the particles. Vacuum annealing enhances the ferromagnetism (FM...

Although aluminum has a smaller modulus in [111]<112> shear than that of copper, we find by first-principles calculation that its ideal shear strength is larger because of a more extended deformation range before softening. This fundamental behavior, along with an abnormally high intrinsic stacking fault energy and a different orientation dependence on pressure hardening, are traced to the dire...

A simple colorimetric method is proposed for the micro-determination of copper in pure forms. The assay is based on the formation of a color complex between copper and resorcinol in presence of ammonia with peak absorption at 450 nm. The method is linear over 0.05 through 1.0 μg Cu (R ≥0.99). The regression coefficients vary from 0.275 to 0.920 depending upon the choice of experimental conditio...