On tailored microstructure in AA 2024 alloy during in-situ microwave casting

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materialia Pub Date : 2024-09-26 DOI:10.1016/j.mtla.2024.102244

Parvej, Apurbba Kumar Sharma

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Abstract

In the present study, application of microwave energy was explored for tailoring the microstructure in AA 2024 alloy through directional solidification route. Microwave transparent (alumina) and absorbing (graphite) mould materials were utilized to investigate the effect of microwave interaction (electric and magnetic field components) with AA 2024 alloy on microstructure evolution in terms of dendrite size distribution and formation of eutectic phase. Results showed more pronounced eutectic phase gradient was developed using alumina mould. On the other hand, a more uniform distribution of eutectic phase and grain size was observed with graphite mould. The development of the eutectic phase gradient is attributed to the effective microwave interaction with the AA 2024 alloy melt during solidification. This is primarily associated with the formation of an additional flux at the solid-liquid (S/L) interface of the alloy under the effect of magnetic field and an enhancement in diffusion flux due to mass transport caused by electric field component of microwave. Formation of AlCu, Al₂Cu, and Al₂CuMg intermetallic phases in both alumina and graphite mould casts was confirmed. Significantly higher hardness was observed at the higher eutectic phase sites within the alumina mould cast, whereas graphite mould casts exhibited better tensile properties.

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原位微波铸造过程中 AA 2024 合金的定制微观结构

在本研究中，探索了应用微波能通过定向凝固途径定制 AA 2024 合金微观结构的方法。利用微波透明（氧化铝）和吸收（石墨）模具材料研究了微波与 AA 2024 合金的相互作用（电场和磁场成分）对微观结构演变的影响，包括枝晶尺寸分布和共晶相的形成。结果表明，使用氧化铝模具可形成更明显的共晶相梯度。另一方面，使用石墨模具时，共晶相和晶粒大小的分布更为均匀。共晶相梯度的形成归因于凝固过程中微波与 AA 2024 合金熔体的有效相互作用。这主要与磁场作用下在合金的固液（S/L）界面形成的额外磁通量以及微波电场分量引起的质量传输导致的扩散磁通量增强有关。在氧化铝和石墨铸模中形成的 AlCu、Al2Cu 和 Al2CuMg 金属间相得到了证实。在氧化铝结晶器铸件的高共晶相部位观察到了明显更高的硬度，而石墨结晶器铸件则表现出更好的拉伸性能。

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来源期刊

Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.40

自引率

2.90%

发文量

345

审稿时长

36 days

期刊介绍： Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).