X-ray Diffraction and Calorimetric Study of Al-Cu Mixtures Subjected to Plastic Deformation under High Pressure

Abstract

Aluminum-copper mixtures of various compositions are subjected to plastic deformation at room temperature and pressures from 1 to 5 GPa in a high-pressure apparatus of Bridgman anvil type. According to X-ray analysis, an ultradispersed structure with a coherent scattering region size of 10 to 20 nm is formed in the samples, with hardness of the material being as high as 530 kgf/mm2. Differential scanning calorimetry measurements show that heating from 25 to 285°C induces exothermic process in the samples subjected to deformation with a specific enthalpy of 120 J/g.