(IV)微粉体の相転移
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概要
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Characteristic properties of phase transition particles such as martensitic transformation, order-disorder transition in fine particles of Fe-Ni alloy were discussed in correlation with particle size. The mechanisms of γ-α phase transition of ferric oxide were also suggested from the electron diffraction studies of particles.<BR>In genaral, diffusionless martensitic transformation, is suppresed with the decreasing of particle size. This effect is explained by the decrease of dislocarion density in fine particles. Meanwhile order-disorder transformation which accompanies diffusion is promoted by the excess vacancies introduced by the surface tension effect.<BR>Lastly shape and size effects in the transformation of γ-ferric oxide were desccribed.
- 社団法人 粉体粉末冶金協会の論文