|
In the present work, using the method of a composite piezoelectric oscillator at a
frequency of 99-102 kHz, polycrystalline magnesium was studied under two types of
treatment: deformation and subsequent annealing. The influence of these types of treatments
on changes in the dislocation density and such an important structurally sensitive parameter as
the dynamic Young's modulus has been established. The values of micro-yield stress are
determined. With a longitudinal deformation of 1.7%,
at the strain amplitude of 5×10-6 , its
value decreased from 2.9 MPa to 1.7 MPa; after annealing at 400 œC, it increased to 5.8 MPa.
Keywords: Magnesium, mechanical spectroscopy, dislocation density, Young's modulus, internal friction, microplastic deformation |
full paper (pdf, 1440 Kb)