MIS SENSOR FOR INVESTIGATION OF MECHANICAL-PROPERTIES OF METALS

A method has been developed to investigate the effect of gas release f rom metal specimens under the action of mechanical loading. The method is based on the use of a chemical MIS (metal-insulator-semiconductor) sensor of Pd-SiO2-Si type. The developed method allows investigations to be carried out in different gaseous media in a wide range of press ures both above and below atmospheric pressure. A set-up has been desi gned and used for the measurement of H-2 mass released on rupturing te st specimens of steel, aluminium, copper and zirconium. The H-2 mass r eleased from different metals is different and varies in the range 10( -9)-10(-10) g. The measurements are carried out in an inert medium (He ) at atmospheric pressure. The effect of gas release from stainless st eel specimens before the threshold of failure has been observed. The c haracter of the gas release from strained specimens enables one to jud ge their mechanical strength.