Two-Phase Microstructures Formed by Phase-Separations of Ordered Precipitates in Fe-Si-V Alloys

Minoru Doi; Tomokazu Moritani; Takao Kozakai

doi:10.4028/www.scientific.net/MSF.561-565.2357

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HomeMaterials Science ForumMaterials Science Forum Vols. 561-565Two-Phase Microstructures Formed by...

Two-Phase Microstructures Formed by Phase-Separations of Ordered Precipitates in Fe-Si-V Alloys

Abstract:

Phase-separation of D03 precipitates in A2 matrix of Fe-Si-V alloys was investigated with TEM. When Fe-14.5at%Si-12.9at%V alloy is aged at 873 K, the phase-separation of cuboidal D03 precipitates occurs and A2 particles newly appear in each D03 cuboid. The A2 particles grow to become plates, then the A2 plates elongate along {100} to reach the A2 matrix, and finally the split of D03 cuboid is realized to form smaller cuboids. When Fe-15.5at%Si-5.0at%V alloy is aged at 873 K, the phase-separation of rod-shaped D03 precipitates occurs and A2 particles newly appear in each D03 rod. The A2 particles elongate along the long axis of D03 rod to reach the A2 matrix, and the split of D03 rod is realized to form thinner rods. The split in each alloy brings the refinement of two-phase microstructure, which is a result of not only the elastic energies but also the chemical free energy.

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Materials Science Forum (Volumes 561-565)

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2357-2360

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.2357

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Online since:

October 2007

Authors:

Minoru Doi, Tomokazu Moritani, Takao Kozakai

Keywords:

DO₃ Phase, Elasticity Effect, Phase Transformation, Precipitate Morphology, Split, TEM

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