Investigation of diffusion characteristics and mechanical properties of Mg-La system

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Vacuum Pub Date : 2025-09-01 Epub Date: 2025-04-15 DOI:10.1016/j.vacuum.2025.114336

Fali Liu , Liyang Fang , Hongyu Zhang , Yongkang Tan , Jiang Wang , Guanglong Xu , Yifang Ouyang , Xiaoma Tao

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Abstract

Mg-RE alloys have great potential for development due to the excellent strength and creep resistance. Given the importance of diffusion kinetic behavior in studying the effect of alloying elements on microstructure evolution, the diffusion kinetic behavior of Mg-La system and the mechanical properties of related IMCs were systematically studied by diffusion couple method in this work. After vacuum annealing at 738–813 K, the composition of the diffusion region was analyzed by EPMA, and five IMCs were observed: Mg₁₂La, Mg₁₇La₂, Mg₄₁La₅, Mg₃La, and MgLa. The presence of Mg₄₁La₅ indicates that its decomposition temperature should be lower than 738 K. Upon kinetic study, it was determined that the growth of all phase layers adhered to the parabolic growth law, allowing for the estimation of interdiffusion coefficients and activation energies for the five IMCs. Additionally, the mechanical properties of the relevant IMCs were evaluated using both first-principles calculations and nanoindentation experiments. The results showed that the hardness and Young's modulus of all IMCs were significantly higher than those of pure Mg. The relevant data obtained in this work will be beneficial to the design and development of high-performance Mg-La-based alloys.

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Mg-La体系扩散特性及力学性能研究

Mg-RE 合金具有优异的强度和抗蠕变性，因此具有巨大的发展潜力。鉴于扩散动力学行为在研究合金元素对微观组织演变影响方面的重要性，本研究采用扩散耦合法系统研究了 Mg-La 体系的扩散动力学行为及相关 IMC 的力学性能。在 738-813 K 真空退火后，用 EPMA 分析了扩散区的成分，观察到五种 IMC：Mg12La、Mg17La2、Mg41La5、Mg3La 和 MgLa。经动力学研究确定，所有相层的生长都遵循抛物线生长规律，从而可以估算出五种 IMC 的相互扩散系数和活化能。此外，还利用第一原理计算和纳米压痕实验对相关 IMC 的机械性能进行了评估。结果表明，所有 IMC 的硬度和杨氏模量都明显高于纯镁。本研究获得的相关数据将有助于设计和开发高性能的镁镭基合金。

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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.