Microstructural evolution and solute migration in the mushy zone of peritectic Al-18At. % Ni alloy in high magnetic fields
Microstructural evolution and solute migration in the mushy zone of peritectic Al-18At. % Ni alloy in high magnetic fields
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显微组织%20演化%20和%20溶质%20迁移%20in%20the%20糊状%20zone%20of%20包晶%20Al-18At.%20%%20Ni%20合金%20in%20high%20磁%20场
DOI：
10.1007/s11661-020-06116-1
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Wang Qiang
中科院分区：
文献类型：
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作者：
Jinge Yan;Tie Liu;Jing Liao;Jinmei Sun;Xiaoyu Guo;Zhongming Ren;Wang Qiang
研究了Al-18铝合金凝固过程中糊状区的溶质迁移行为。研究了镍基合金在强磁场下的磁性能。热稳定后在不同磁场下进行淬火实验。通过定向凝固实验研究了合金的析出机理。强磁场对溶质在糊状区的迁移有显著影响。磁场作用下，原始胞状的Al 3 Ni相变成了不规则的块状，并析出了许多细小的树枝状Al 3 Ni相，这是以前没有观察到的。定向凝固实验证明，枝晶相在淬火过程中析出。磁场的应用导致原本笔直清晰的界面变得凹凸不平。耦合的洛伦兹力，热电磁力，和磁场力被提出来解释溶质迁移的糊状区。这种耦合作用阻碍了原有的溶质迁移行为和晶体生长机制，导致熔体沿着横向熔化和凝固，并在热稳定过程中产生大量富Ni液滴和在周界面富集的Ni原子。本研究丰富了强磁场对包晶合金凝固过程的影响机理，为进一步调控合金的组织和性能提供了可能。
The solute migration behavior in the mushy zone of an Al-18 at. pct Ni alloy under a high magnetic field was investigated experimentally. Quenching experiments were carried out under different magnetic fields after thermal stabilization. Directional solidification experiments were conducted to explore the precipitation mechanism. A high magnetic field affected the solute migration in the mushy zone significantly. When exposed to a magnetic field, the original cellular-like peritectic Al3Ni changed into an irregular block shape, with many precipitated small dendritic Al3Ni phases, which have not been observed previously. Directional solidification experiments proved that the dendrite phase precipitated during quenching. The application of a magnetic field resulted in the original straight and clear peritectic interfaces becoming uneven and rugged. A coupling of Lorentz, thermoelectromagnetic, and magnetic forces was proposed to explain solute migration in the mushy zone. This coupling hindered the original solute transport behavior and crystal growth mechanism, induced melting and solidification along the transverse direction, and produced many Ni-rich droplets and concentrated Ni atoms at the peritectic interface during thermal stabilization. This study enriches the influence mechanism of high magnetic fields on the solidification of peritectic alloys and provides the possibility for further microstructure and alloy property regulation.