PHYSICAL PRINCIPLES FOR NONDESTRUCTIVE TESTING OF PURE METAL COMPONENTS

Effects are considered that are dependent on conduction-electron relax ation time, which are applied to nondestructive testing of pure-metal components. Conditions are given under which one can use some effects for measuring or estimating the relaxation time: Doppler-shifted acous tic cyclotron resonance, quantized oscillations in ultrasound absorpti on, and helicon resonance. These phenomena are compared, as are method ; of measuring the resistivity and eddy currents in order to estimate the purity and structural perfection. The methods are classified as be ing applicable to single-crystal and polycrystalline specimens.