TEM study of NbC heterogeneous precipitation in ferrite
TEM study of NbC heterogeneous precipitation in ferrite
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DOI：
10.1080/14786430500479720
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发表时间：
2006-09
影响因子：
1.6
通讯作者：
F. Perrard;Patricia Donnadieu;Alexis Deschamps;Patrick Barges
中科院分区：
文献类型：
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作者：
F. Perrard;Patricia Donnadieu;Alexis Deschamps;Patrick Barges
用透射电镜定量地研究了Fe-C-Nb模型合金在不同等温热处理条件下NbC在铁素体中的非均匀析出。使用暗场成像导出析出物的延伸率和尺寸分布。对于每个沉淀状态，NbC的沉淀发生在位错上，由于淬火状态。这种沉淀机制导致沉淀物的特征阵列，其中沉淀物以自相似的方式生长。对这些排列的详细研究表明，大多数被这些排列修饰的位错都是具有1112型线矢量的刃型位错。对于给定的脱位只有一个变体。这种选择可以用位错和沉淀应变场的相互作用来解释。
The heterogeneous precipitation of NbC in ferrite has been quantitatively characterized by transmission electron microscopy in a Fe–C–Nb model alloy for different isothermal heat treatments. The elongation and size distribution of precipitates were derived using dark field imaging. For each precipitation state, the precipitation of NbC occurs on dislocations due to the as-quenched state. This precipitation mechanism leads to characteristic arrays of precipitates in which precipitates grow in a self-similar manner. A detailed study of these arrays has shown that most dislocations decorated by these arrays are edge dislocations with ⟨112⟩ type line vectors. There is only one variant on a given dislocation. This selection can be interpreted by the interaction between dislocation and precipitate strain fields.