粉末焼結材の性質に関するX線的研究

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The sintered materials have recently come to be extensively applied in various fields by the continued improvement of their properties. It must be emphasized, however, that some mechanical properties of sintered materials are inferior to those of materials produced by machining bar stock. To improve those properties, the evaluating method for the properties must be established. For example, the inferiority in toughness of the sintered materials has been a deterrent in some applications, and there has been no correct evaluating method for the toughness of sintered materials. The X-ray diffraction techniques may be available for these purposes. However, little has been done in the application of the X-ray techniques as evaluating method for the properties of sintered materials.<BR>In this investigation, the diffraction patterns of iron powder, ferrous compacts, and ferrous sintered specimens were taken, and their half-value breadth was measured. Besides, a similar X-ray examination of the specimens was carried out after their bending test. The results obtained are as follows:<BR>(1) The lattice strain of iron compact induced by the compaction disappears easily by the sintering. In the case of mixed powder compact, the diffraction pattern gives a broad line after the sintering corresponding to the insufficient inter-diffusion during sintering, and the changes in the half-value breadth may be good indication of the degree of inter-diffusion.<BR>(2) The diffraction patterns taken at the portion near the fractured surface give good information on the toughness of sintered materials. By this method, the correct value is obtained of the increase of toughness by high temperature sintering, and of the effect of copper and nickel on the toughness of sintered ferrous materials.
社団法人日本材料学会の論文

粉末焼結材の性質に関するX線的研究

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