81.40.Gh, 81.40.Np ВЛИЯНИЕ ЛЕГИРОВАНИЯ ЖЕЛЕЗОМ СПЛАВОВ НИКЕЛЬ-МОЛИБДЕН НА ПАРАМЕТРЫ ИХ ОКИСЛЕНИЯ Экспериментально исследовано влияние легирования железом на скорость окисления и жаростойкость сплавов Ni-Mo в зависимости от концентрации железа. Методами термогравиметрии и рентгенодифракционного анализа показано, что эффект влияния добавок до 20 мас. % железа на сопротивление окисляемости сплавов никель-молибден не носит прямой зависимости от количества лигатуры. Установлено, что 5% добавка железа обеспечивает максимальную жаростойкость Ni-Mo сплавов. Определено, что эффективному повышению сопротивляемости окислению сплавов никель-молибден способствуют добавки
As a result of the research, formulas for calculating shear elastic constants of cubic crystals, based on the resonant frequency of torsional vibrations of samples c 44 and C' with square and rectangular cross-section in the method of the composite piezoelectric vibrator was obtained. Despite the fact that the resonance method does not need a large single crystals, the calculation formulas for the samples most simple to manufacture prismatic either incomplete or completely unknown. For example, there is data on the calculation of the c 44 and C' of the natural frequencies of torsional vibrations of the rods only circular cross-section. An exception is the ultrasonic pulse method for measuring the elastic constants, but it requires to measure single-crystal samples of sufficiently large size. The calculation is reduced to finding the proper expressions for rotating mechanical torque, which is more or less complex function of the cross-section and the elastic constants of the sample material. At the same time it takes into account the amendment to the warping of the cross-section of anisotropic samples under torsion. Then calculates the natural frequencies of torsional vibration samples of square and rectangular cross-section and the corresponding shear elastic constants. As an example, the calculation of shear considered constant C' on the basis of the pitch frequency of torsional vibrations of square cross-section sample of nickel-titanium NiTi.
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