DEVICE FOR ANALYZING ELASTIC CONSTANT METALS WITH LOW PLASTICITY AND ALLOYS AT HIGH TEMPERATURE

摘要

FIELD: measurement technology.;SUBSTANCE: invention relates to the analysis of strength properties of materials by optical measuring means by applying compressive static loads to them. Device for determining the elastic constants of low-plastic metals and alloys at elevated temperature contains a base with a fixed plate and a movable plate. Laser, beam splitter and mirror are arranged on the base. Ray reflected from the mirror forms the reference arm of a two-arm interferometer of longitudinal deformations. Beam reflected from the beam splitter is guided by a rotary mirror into a four-way transverse deformation interferometer, containing a polarized beam splitter, a quarter-wave and a polarization plate, two retro reflectors and six bypass mirrors that guide the beam of the working arm onto the two opposite mirror-polished side surfaces of the sample of rectangular cross-section. Beam of the working arm of the longitudinal strain interferometer is guided through a mirror inclined at an angle of 45 degrees to the surface of the fixed plate on the mirror surface of the movable plate. Electrodes connected to a direct current source are installed on the outer sides of the plates. Semiconductor layer is placed between one of the plates and the corresponding electrode. Sample is placed between the plates, preload is set, electric current is passed between the electrodes. After heating the sample, it is deformed, the loading force and temperature of the sample are continuously recorded with a thermocouple. Count of the displaced interference lines is made by means of two collimators, two diaphragms, two photodetectors and an electronic processing circuit, arranged successively after the interferometers along the reflected rays of the working arms.;EFFECT: increased accuracy of measurements of the elastic constants of low-plastic metals and alloys at high temperatures.;1 cl, 3 dwg