Modeling remelting induced destabilization of lamellar eutectic structure in an undercooled Ni-18.7 at.% Sn eutectic alloy
Modeling remelting induced destabilization of lamellar eutectic structure in an undercooled Ni-18.7 at.% Sn eutectic alloy
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造型%20重熔%20诱导%20失稳%20of%20层状%20共晶%20结构%20in%20an%20过冷%20Ni-18.7%20at.%%20Sn%20共晶%20合金
DOI：
10.1016/j.jallcom.2020.154018
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发表时间：
2020-06
影响因子：
6.2
通讯作者：
F. Liu
中科院分区：
文献类型：
--
作者：
H. Dong;Y.Z. Chen;K. Wang;G.B. Shan;Z.R. Zhang;W.X. Zhang;F. Liu
实现高熔体过冷度(ΔT)有望成为显著减小块体共晶合金片层间距的有效策略。然而，当ΔT超过一定值时，过冷共晶合金通常会出现粗大的反常共晶组织。在我们最近的工作(Scripta Materialia，177(2020)123-127)中，我们用高温激光扫描共聚焦显微镜技术证明了在过冷的Ni-18.7at.%Sn共晶合金中，重熔引起的初生层状共晶组织(PLE)在后再辉阶段的失稳可以导致AES的形成。在这项工作中，建立了一个在界面稳定性分析框架内的分析模型，以定量描述后复燃期间的PLE失稳。模型计算结果与实验结果吻合较好。基于该模型的分析表明，溶质过饱和度和毛细管力共同驱动了PLES的失稳。前者放大了共晶片层的界面扰动，引发了失稳，后者主导了随后的形态转变过程。我们进一步表明，我们的模型与其他过冷共晶合金的实验结果是一致的。
Achieving a high melt undercooling (ΔT) is expected as an effective strategy to significantly reduce lamellar spacing of bulk eutectic alloys. However, the undercooled eutectic alloys usually exhibit coarse anomalous eutectic structure (AES) when ΔTexceeds a certain value. In our recent work (Scripta Materialia, 177 (2020) 123–127), we showed that in an undercooled Ni-18.7 at.% Sn eutectic alloy the remelting induced destabilization of primary lamellar eutectic structure (PLES) during the post-recalescence period can lead to the formation of the AES using high-temperature laser scanning confocal microscopy technique. In this work, an analytical model within the framework of interface stability analyses is established to quantitatively describe the destabilization of PLES during the post-recalescence period. The model calculations show good agreement with the experimental results. The analyses based on the derived model indicate that the destabilization of PLES is driven by solute supersaturation and capillary force. The former amplifies the interface perturbation of the eutectic lamellae and initiates the destabilization, while the latter dominates the subsequent morphological transition process. We further showed that our model is consistent with the reported experimental results of other undercooled eutectic alloys.
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DOI：
10.1016/0921-5093(93)90244-9
发表时间：
1993-12
影响因子：
6.4
作者：
B. Wei;D. Herlach;F. Sommer;W. Kurz
通讯作者：
B. Wei;D. Herlach;F. Sommer;W. Kurz
影响因子：
41.2
作者：
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通讯作者：
Schultz, L
DOI：
10.1007/s11661-002-0223-1
发表时间：
2002-04-01
影响因子：
2.8
作者：
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通讯作者：
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影响因子：
2.7
作者：
J. F. Li;X. Li;L. Liu;S. Lu
通讯作者：
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DOI：
10.1016/0001-6160(89)90060-6
发表时间：
1989-07
期刊：
Acta Metallurgica
影响因子：
--
作者：
T. Courtney;J. Kampe
通讯作者：
T. Courtney;J. Kampe