An error forms in estimating the Poisson number. A unique high-resolution experimental arrangement for nondestructive strain measurements is reviewed. The resolution of the instrument enabled relatively small elastic strains in weld joints to be investigated. The EB welds may be put into service without postweld heat treatment. In this paper, the motion of dislocations in the field of solute atoms which also move in the lattice is analysed.
Solute atoms influence the dislocation velocity and the friction stress.
The proposed model explains the dynamic strain ageing phenomena such as the occurrence of the plateau stress, the appearance of plastic instabilities and anomalies in the stress dependence of the strain rate sensitivity of the flow stress. The dependences of stress on rate, temperature and the concentration of foreign atoms, obtained using this model, are in qualitative agreement with the experimental dependences. Strength and fracture toughness of four sintered ceramic powder materials were determined. The three and four point flexure procedure were used to evaluate the strength. It was found that the strength was reduced and the toughness increased compared with the respective microstructure data.