Hot tearing behavior and mechanism of AXJ530 alloy under rotating magnetic field

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2025-04-01 DOI:10.1016/j.jma.2024.05.010

Xudong Du , Zhenyao Xu , Feng Wang , Shengwei Bai , Le Zhou , Xiaoqi Kang , Zhi Wang , Jinwei Li

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Abstract

In order to solve the issues concerning high hot tearing susceptibility (HTS) of Mg-Al-Ca series alloys, a rotating magnetic field (RMF) was applied during their solidification. The effect of RMF at different excitation current intensities (50 A, 100 A, and 150 A) on the solidification and hot tearing behavior of AXJ530 (Mg-5Al-3Ca-0.17Sr) alloy was investigated. The results indicated that the HTS of AXJ530 alloy decreased with the increase of excitation current intensity. This aspect can be attributed to significant grain refinement under the action of RMF, which improved the intergranular bonding and relieved the stress concentration. On the other hand, the stirring effect of the electromagnetic force on the melt could break up the developed dendrites and delay the dendrite coherence, as well as optimize the feeding channels and improve the feeding drive of the residual liquid at the end of solidification. Therefore, under the action of RMF, the hot tearing initiation of the alloy was suppressed and the feeding efficiency of the liquid was greatly improved, which led to a noticeable reduction of the HTS of the alloy. Moreover, no significant hot tearing was detected in castings at the excitation current parameters of 150 A and 10 Hz.

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旋转磁场作用下AXJ530合金的热撕裂行为及机理

为了解决Mg-Al-Ca系合金高热撕裂敏感性的问题，在其凝固过程中施加旋转磁场。研究了不同激发电流强度（50 A、100 A和150 A）下RMF对AXJ530 （Mg-5Al-3Ca-0.17Sr）合金凝固和热撕裂行为的影响。结果表明：随着激发电流强度的增大，AXJ530合金的高温超导态逐渐降低；这是由于在RMF作用下晶粒细化显著，改善了晶间结合，缓解了应力集中。另一方面，电磁力对熔体的搅拌作用可以破坏已发育的枝晶，延缓枝晶的一致性，优化凝固后期残余液的进料通道，提高其进料驱动能力。因此，在RMF的作用下，抑制了合金的热撕裂起始，大大提高了液体的进料效率，导致合金的HTS明显降低。在激励电流为150 A和10 Hz时，铸件未发现明显的热撕裂现象。

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.