The effect of cyclic change of the normal and superconducting states of single crystals of Pb–In alloys is manifested in the form of strain hardening. The increase in the deforming stress in this case is attributed to an increase in the density of structural defects.
Plastic-flow instability in the form of low-amplitude 10−2–10−1MPa aperiodic jumps of the deforming stress has been observed and investigated during the deformation of polycrystals of the alloys Pb–(20–55)at.%In in the superconducting state. The amplitude and number of stress jumps were studied as a function of the state of the metal (normal or superconducting) and the degree of distortion of the crystal lattice as a result of intrinsic and extrinsic defects. Possible mechanisms for in the low-amplitude jump-like deformation of the alloy are discussed.
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