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采用挤压铸造法制备了Al2O3短纤维增强Al-4.5Cu复合材料,研究了凝固组织及其偏析现象,结果表明:用挤压铸造法制备的复合材料的组织致密,纤维分布均匀,基体组织细小,纤维与基体间存在明显的界面层,在凝固过程中,α-Al相在短纤维间隙中形核并向纤维表面生长,θ-CuAl2相以Al2O3短纤维为基底非匀质形核;随着预制件温度的升高,纤维表面Cu元素的浓度增大,纤维间隙中的Cu元素的浓度减小,即元素的偏析现象显著。 相似文献
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《中国有色金属学会会刊》2021,31(7):1853-1867
The objective of the work is focused on predictions of microsegregation, solidification speed, dendritic arm spacings and dendrite morphology by phase-field model. The numerical results were compared with experimental data. The experimental values for cooling rates and effective partition coefficient were adopted during calculations. The results of microsegregation through phase-field model show excellent agreement with the experimental data. Such excellent agreement is because cooling rates, effective partition coefficient and back-diffusion of solute are considered in the model. For solidification speed, the calculation results show good agreement with the experimental data. Tertiary dendritic arm spacing calculated with phase-field model is compared with experimental data. The results show good agreement between them. The dendrite arm spacing varies with position because high cooling rates are responsible for the refinement effect on microstructure. Finally, two-dimensional simulation produced a dendrite that is similar to that found in the experiment. 相似文献
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采用液态金属冷却高温度梯度定向凝固设备.研究了抽拉速率跃迁对单晶高温合金DD3一次枝晶间距和微观偏析的影响.结果表明,单晶高温合金枝晶一次间距表现出明显的历史相关性.当抽拉速率(或生长速率)分别从600和300μm/s跃迁到100μm/s和直接以100μm/s速率生长时,一次间距分别为56.5,86和111.5μm.而生长速率分别从50和100μm/s跃迁到300μm/s和直接以300μm/s速率生长获得的一次间距分别为109,93和70μm.一次间距值与Hunt-Lu模型预测的基本吻合,但实验结果证明其上限与下限的比值λ_1~(max)/λ_1~(min)>2,与Ma Sahm的预测结果一致.成分分析表明,相同稳态条件下枝晶的一次间距变小.偏析也有所降低. 相似文献
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This paper shows the results of welding tests used so far on high-temperature creep resistant steels and new bainitic and martensitic steels. The positive results of this research allowed the elaboration of a welding procedure specification that was ultimately approved by TÜV. This then allowed the SEFAKO Company to attempt welding of the latest generation boiler steels for use under heavy conditions. 相似文献
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Carsten Tschierske 《Israel journal of chemistry》2012,52(10):935-959
This review is focused on the basic concepts of microsegregation and a fundamental understanding of the formation of positionally ordered LC phases based on micro- and nanophases, interaction parameters and interfaces. Selected examples were chosen from the actual literature to illustrate the concepts. Microsegregation is the basis of classical LC phases and cybotaxis, and most importantly, it paves the way to a huge number of new LC phases. Beside the distinct modes of micellar packing motifs and liquid quasicrystals formed by self-assembly of dendritic molecules, attention is also focused on the specific effects of rigid anisometric units and polyphilicity. Honeycomb LC phases, vesicular LC phases and mesophases with 3D-lattices lead to enhanced complexity of LC self-assembly. 相似文献