Open AccessУдарное и "задержанное" повреждение поверхности керамики ZnS-CVD
Author(s) -
И. П. Щербаков,
А. А. Дунаев,
A. B. Sinani,
A. E. Chmel
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.22.48648.17786
Subject(s) - acoustic emission , nucleation , materials science , dislocation , chemical vapor deposition , composite material , irradiation , mineralogy , chemistry , physics , thermodynamics , nuclear physics , nanotechnology
Impact and impeded damage of ZnS-CVD ceramics surfaceI.P. Shcherbakov, A.A. Dunaev, A.B. Sinani, A.E. Chmel Localized damage of the surface of ductile ZnS ceramics synthesized by the chemical vapor deposition (CVD) method was performed by either impact of a pointed striker or by the impeded indenting of a Vickers pyramid. In both cases, the time series of acoustic emission pulses were recorded. The duration of the impact-induced sound emission was of 0.3-0.5 ms, while the indenting-produced active phase of emission was of 3-5 ms in length. The primary emission followed by the irradiation of weak acoustic signals during 80-100 ms. The statistical analysis of the time series showed the exponential (poissonian) energy distribution in impact-induced pulses, while in indented specimens, the distribution function followed a power law of the Gutenberg-Richter type. Considering that dislocation clusters serve as weak points for the crack nucleation, the difference in the mode of energy yield was explained by varying temporal pattern characteristics of the strain-stimulated dislocation motion in different time domains.