首页|Two-Phase Micrestructures Formed by Phase-Separations of Ordered Precipitates in Fe-Si-V Alloys
Two-Phase Micrestructures Formed by Phase-Separations of Ordered Precipitates in Fe-Si-V Alloys
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NETL
Phase-separation of D0_3 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 D0_3 precipitates occurs and A2 particles newly appear in each D0_3 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 D0_3 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 D0_3 precipitates occurs and A2 particles newly appear in each D0_3 rod。 The A2 particles elongate along the long axis of D0_3 rod to reach the A2 matrix， and the split of D0_3 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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