Abstract
Data on the damping capacity of Mn – Cu alloys are adduced. The results of studying the influence of alloying elements, natural ageing at temperatures of 293 K, 273 K and 263 K on the stability of the damping capacity of Mn – Cu alloys are presented. The high damping capacity of Mn – Cu alloys decreases by 4 ... 6 times during natural ageing at 293 K, remains during 1,7 years of natural ageing at 273 K and 263 K. The analysis of factors that should be considered responsible for a sharp decrease in the damping capacity of Mn – Cu alloys during natural ageing is submitted.
Highlights
The development of modern industrial production is associated with an increase in the speed of movement of parts of mechanisms and machines, which cause vibrations and noise
The high damping capacity of Mn – Cu alloys is associated with the movement of twins of the martensitic f.c.t. phase, obtained as a result of the martensitic f.c.c. – f.c.t. transformation (f.c.t. – face-centered tetragonal; f.c.c. – face-centered cubic)
The results of some studies show, that spinodal decomposition occurs in Mn – Cu alloys with the formation of microsegregations of two isomorphic phases with f.c.c. lattices, which are enriched in manganese and copper [5,6,7]
Summary
The development of modern industrial production is associated with an increase in the speed of movement of parts of mechanisms and machines, which cause vibrations and noise. It’s assumed that the decrease in the damping capacity of Mn – Cu alloys during natural ageing is caused by a decrease in internal stresses in martensite, point defects in the crystal structure, atoms of impurity elements [4, 9,10,11,12]. The influence of these factors on the reduction of the damping capacity of Mn – Cu alloys has not been sufficiently studied.
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