Ａｌ‐Ｍｇ‐Ｓｃ合金におけるＡｌ３Ｓｃ粒子のオストワルド成長
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The Ostwald ripening of Al3Sc particles in an Al-1 mass% Mg-0.27 mass% Sc alloy aged at 673, 698 and 723 K has been investigated. The size of the particles was determined by transmission electron microscopy and the Sc concentration in the Al matrix by electric resistivity measurements. The transition from growth to coarsening is found to occur. The Al3Sc particles grow more slowly at the coarsening stage than at the growth stage. The coarsening rate is identical with that of Al3Sc particles in an Al-0.28 mass% Sc alloy. Application of the Lifshitz-Slyozov-Wagner theory has enabled us to calculate independently the matrix/Al3Sc interface energy γ and volume diffusion coefficient D of Sc in Al during coarsening of particles. The estimates of γ and D are in agreement with those derived by the same method from data on coarsening of Al3Sc particles in the Al-Sc alloy. Whether the particles are coherent or semi-coherent with the matrix, the value of γ is nearly 230 mJm-2.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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