Title :
Ultrasonic fatigue of nickel-chromium alloys at low temperatures
Author_Institution :
Inst. of Metal Phys., Kiev, Ukraine
Abstract :
The influence of low temperature ultrasonic deformation on the electrical resistivity and magnetic properties of nickel-chromium dilute solid solutions is examined. It is shown that changes in the electrical resistivity and magnetic properties of prequenched samples after ultrasonic fatigue can be explained by order-disorder processes during fatigue. It is concluded that ordering at low temperatures during the ultrasonic deformation is associated with high strain rate and high vacancy concentration produced by deformation.<>
Keywords :
acoustoelectric effects; chromium alloys; coercive force; dilute alloys; electrical conductivity of crystalline metals and alloys; fatigue; ferromagnetic properties of substances; magnetic properties of dilute systems; magnetoacoustic effects; nickel alloys; short-range order; ultrasonic effects; ultrasonic materials testing; vacancies (crystal); 17.5 kHz; 4.2 to 300 K; NiCr alloys; SRO formation; coercive force; dilute solid solutions; electrical resistivity; ferromagnetic alloys; low temperature ultrasonic deformation; magnetic properties; magnetisation; order-disorder processes; prequenched samples; short range order; strain rate; ultrasonic fatigue; ultrasonic testing technique; vacancy concentration; Capacitive sensors; Chromium; Conductivity; Electric resistance; Fatigue; Magnetic properties; Nickel alloys; Solids; Stress; Temperature;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
