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首页> 外文期刊>ISIJ international >Transmission electron microscopy observations of the phase separation of DO_3 precipitates in an elastically constrained Fe-Si-V alloy
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Transmission electron microscopy observations of the phase separation of DO_3 precipitates in an elastically constrained Fe-Si-V alloy

机译：弹性约束Fe-Si-V合金中DO_3析出物相分离的透射电镜观察

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摘要

When Fe-16.2 mol percent Si-13.3 mol percent Valloy is homogenized at 1 473 K for 7.2 X 10~3 s and then quenched into iced brine, D0_3 (ordered bcc) particles appear in the A2 (disordered bcc) matrix. The D0_3 particles are cuboidal because of the influence of elastic energy which arises from the lattice mismatch between the A2 matrix and the D0_3 particle. When the two-phase microstructure of A2 + D0_3 is aged at 923 K, the phase separation of D0_3 precipitate takes place and fine A2 particles appear in each cuboidal D0_3 particle. In the course of further ageing at 923 K, the A2 particles coarsen to become plates in the D0_3 particles as a result of elastic energies, then the A2 plates elongate along {100} to reach the A2 matrix surrounding the D0_3 particles, and finally the split of D0_3 particles is realized. Such a split phenomenon takes place throughout the microstructure to bring the refinement or at least the decelerated coarsening of two-phase microstructure, which is a result of not only the elastic energies but also the chemical free energy.
机译：当Fe-16.2 mol％Si-13.3 mol％Valloy在1473 K下均质7.2 X 10〜3 s，然后淬灭到冰盐水中时，D0_3（有序bcc）颗粒出现在A2（无序bcc）基质中。由于弹性能的影响，D0_3粒子是长方体，这是由A2矩阵和D0_3粒子之间的晶格失配引起的。当A2 + D0_3的两相微结构在923 K时效时，发生D0_3沉淀的相分离，并且在每个长方体D0_3颗粒中均出现了细小的A2颗粒。在923 K处进一步老化的过程中，由于弹性能，A2粒子变粗成为D0_3粒子中的板，然后A2板沿{100}延伸，到达D0_3粒子周围的A2矩阵，最后实现了D0_3粒子的拆分。这种分裂现象发生在整个微结构中，以引起两相微结构的细化或至少是减速的粗化，这不仅是弹性能的结果，而且是化学自由能的结果。

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