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In this paper, we explain the method for analysing the structural changes of material by means of measuring the specific volume or gravity. As materials are to be affected in their specific volume or the gravity by the change of phase caused by heat treatment, aging and so on, and if the specific volume or the gravity reflects very sensibly the phase changes, we may be able to analyse the material conveniently by means of the precision chemical balnace only, without using special apparatus. So, we describe the measuring method, and by examining the data of the measurement, we know that the specific volume or the gravity well corresponds to the internal change. The results are consistent with the change of length ascertained by means of the dilatometer (it is natural that the change of specific volume of materials is affected by the third degree as compared with the length), and agree with the changes of the lattice constant observed by the X-ray analysis (it means that the lattice constant decreases with microscopic volume and the increases with expansion, and the change of the specific volume macrocopically corresponds to the microscopic change). We think the above justifies the analysis, and introduce some examples applied to the industrial method of the material analysis. That is : (1) Applying it on the analysis of the internal change in steel, iron and brass caused by heat treatment, there is a change peculiar to material in specific volume, so we can exactly know the internal change in composition. (2) And using the analysis of the aging in aluminium and its alloys, we can obtain the data as an aid for analysing the aging mechanism.
社団法人日本材料学会の論文
1957-05-15

比容積分析について

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