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Microstructure and Thermal Stability of Lamellar Cr-Silicides

机译:层状Cr-硅化物的组织和热稳定性

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摘要

Directional solidification of Cr-Cr_3Si eutectic alloys in an optical floating zone furnace can produce well-aligned, fully lamellar microstructures, consisting of alternating lamellae of Cr_3Si and a Cr-Si solid solution. The lamellar spacing was found to vary inversely with square root of growth rate, consistent with predictions of the Jackson-Hunt theory. At very low and high growth rates the lamellar structure breaks down and yields degenerate and cellular structures, respectively. Elevated temperature exposures cause the lamellar structures to spheroidize rapidly. Micro alloying elements have been identified that significantly slow down the coarsening kinetics of the Cr-Cr_3Si lamellae.
机译:Cr-Cr_3Si共晶合金在光学浮区炉中的定向凝固可以产生排列整齐的完全层状微结构,该结构由Cr_3Si的交替层和Cr-Si固溶体组成。发现层间距与增长率的平方根成反比,与杰克逊-亨特理论的预测一致。在非常低和很高的增长率下,层状结构分解,分别产生简并的和细胞结构。暴露在高温下会导致层状结构迅速球形化。已发现微合金元素会显着减慢Cr-Cr_3Si薄片的粗化动力学。

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