冷却对超共晶锌铝合金纳米共晶相形成的影响

Q4 Physics and Astronomy

Defect and Diffusion Forum Pub Date : 2023-12-12 DOI:10.4028/p-Nse4Xi

A. Hu, Henry Hu, Xingyuan Wei, X. Nie

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引用次数: 0

摘要

为了解纳米相的形成，在 0.04 和 10.00 °C/s 两种不同的冷却速率下对含 6 wt% Al 的过共晶锌铝合金进行了冷却实验。所采用的冷却速率对所研究合金的相变行为有很大影响。随着冷却速率从 0.04 ℃/s 上升到 10 ℃/s，初级相成核的液相温度 (TN) 从 390.3 ℃ 下降到 382.9 ℃，过冷度从 0.7 ℃ 上升到 8.1 ℃。当冷却速度从 0.04°C/s 增加到 10.00°C/s 时，共晶和共晶体温度分别从 381.5、277.7 °C 下降到 375.6 和 267.6 °C。扫描电镜和 EDS 分析表明，凝固的合金含有原生的 γ-ZnAl 相、共晶的 β-Zn 相、共晶的 α-Al 相和共晶的 β-Zn 相。快速冷却导致的快速相变和转变形成了纳米共晶相和精细的微观结构。

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Cooling Effect on Nano Eutectoid Phase Formation of Hypereutectic Zn-Al Alloy

To understand the nano phase formation, cooling experiments of a hypereutectic Zn-Al alloy containing 6 wt% of Al are carried out under two different cooling rates of 0.04 and 10.00 °C/s. The applied cooling rates significantly influence the phase change behavior of the investigated alloy. The liquidus temperature (TN) for the nucleation of the primary phase decreases from 390.3 to 382.9 °C, and the undercooling increases from 0.7 to 8.1 °C, as the cooling rate rises from 0.04 to 10 °C/s. The eutectic and eutectoid temperatures decrease from 381.5, 277.7 to 375.6 and 267.6 °C, respectively, when the cooling rate increases from 0.04 to 10.00 °C/s. The SEM and EDS analyses reveal that the solidified alloy contains the primary γ-ZnAl phase, the eutectic β-Zn phase, and the eutectoid α-Al and eutectoid β-Zn phases. The fast phase change and transformation caused by rapid cooling results in the formation of nano eutectoid phases and fine microstructure.

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来源期刊

Defect and Diffusion Forum Physics and Astronomy-Radiation

CiteScore

1.20

自引率

0.00%

发文量

127

期刊介绍： Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.