Effect of preheating treatment in Ar atmosphere on oxidation resistance of Mg-Y alloys and formation of oxide film

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Vacuum Pub Date : 2024-11-17 DOI:10.1016/j.vacuum.2024.113836

S.Y. Liu , J. Apell , B. Li , Z.H. Liu , G.J. Liu , X.Y. Lang , Y.F. Zhu , Q. Jiang

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Abstract

Magnesium and its alloys occupy a vital role in the aerospace, automotive and communications industries due to their low density, high specific strength and electromagnetic shielding capabilities. However, due to the strong affinity of Mg for O and the fact that MgO is generally not protective, application of Mg and its alloys at high temperature often results in catastrophic oxidation. One promising approach is based on the addition of Y in combination with a suitable pretreatment to achieve a protective oxide. Therefore, the oxidation resistance (OR) of Mg-xY (x = 0.5, 2.5 and 5.5 wt%) was investigated after using a preheating treatment in Ar atmosphere. The oxidation resistance of preheated Mg-xY alloys is greatly improved compared to unpreheated alloys and pure Mg, particularly for x = 2.5. This improvement is attributed to the enrichment of Y to the surface caused by outward diffusion of Y, and subsequent selective oxidation of Y under low oxygen partial pressure to generate a dense and compact protective film, composed of an outer thin MgO/Y₂O₃ composite layer and an inner thick Y₂O₃ layer. Some flocculent MgO/Y₂O₃ composites were observed on the surface of preheated Mg-5.5Y during the oxidation process, lowering the OR of this alloy.

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氩气环境中的预热处理对 Mg-Y 合金抗氧化性和氧化膜形成的影响

镁及其合金具有密度低、比强度高和电磁屏蔽能力强的特点，在航空航天、汽车和通信行业中发挥着重要作用。然而，由于镁与 O 的亲和力很强，而且氧化镁通常不具有保护作用，因此在高温下使用镁及其合金往往会导致灾难性的氧化。一种可行的方法是在添加 Y 的同时进行适当的预处理，以获得保护性氧化物。因此，在氩气环境中进行预热处理后，对 Mg-xY（x = 0.5、2.5 和 5.5 wt%）的抗氧化性（OR）进行了研究。与未加热的合金和纯镁相比，预热 Mg-xY 合金的抗氧化性大大提高，尤其是 x = 2.5 时。这种改善归因于 Y 的向外扩散使 Y 富集到表面，随后 Y 在低氧分压下发生选择性氧化，生成一层致密而紧凑的保护膜，该保护膜由外层薄 MgO/Y2O3 复合层和内层厚 Y2O3 层组成。在氧化过程中，在预热的 Mg-5.5Y 表面观察到一些絮状 MgO/Y2O3 复合材料，从而降低了这种合金的 OR。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.