VOLUME RATIO OF AN OXIDE TO THE METAL
合金上氧化物的体积比的分析

The volume ratio of an oxide to the metal which undergoes oxidation to form the oxide, known as Pilling\|Bedworth Ratio (PBR), is an important factor as a criterion of integrity of the oxide on pure metals. PBR is one of main reasons for the generation of the growth stress in the oxide, its value is applied in the analysis of the oxide stress. Up to now, the value of PBR is only concerned with the oxide formed on pure metals. In order to evaluate the value of PBR for the oxide formed on alloys, a simple model has been established in the present paper. The data of PBR of the exclusive oxide or the mixed oxide scale on some alloys are obtained. PBR of an oxide on the alloy is different with that on the corresponding pure metal, and is related with the composition of the alloy.