Measurement of Diffusion Coefficients and Assessment of Atomic Mobilities in HCP Mg-Ag-Sn Alloys

IF 1.5 4区 材料科学 Q4 CHEMISTRY, PHYSICAL
Yang Yang, Lilong Zhu, Michele V. Manuel
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Abstract

Reliable thermodynamic and kinetic databases are essential for designing and developing novel magnesium (Mg) alloys for elevated-temperature applications in the automotive and aerospace industries. This study investigated diffusion behaviors of HCP Mg-Ag-Sn alloys by four sets of three diffusion couples annealed at 450, 500, and 550 °C, respectively. Interdiffusion and impurity diffusion coefficients at the three annealing temperatures were extracted using the forward-simulation method. The determined diffusion coefficients, combined with prior results in the literature, were then used to assess atomic mobilities for the HCP phase of the Mg-Ag-Sn system. This assessment was conducted using the DICTRA and the TCMG5 thermodynamic database within the Thermo-Calc software. Comprehensive comparisons between calculated and experimental diffusion coefficients yielded an excellent agreement. The atomic mobilities were also further validated by appropriate predictions of concentration profiles and diffusion paths observed in independent diffusion couple experiments performed at 525 °C for 18 hrs. It has been found that the addition of Sn and Ag both increase the diffusivity of Ag in HCP Mg and Sn in HCP Mg in the stable temperature range of HCP Mg, respectively. This improved understanding of the kinetics in the Mg-Ag-Sn ternary system is essential for controlling diffusion-dependent properties such as coarsening and, therefore, the mechanical properties of Mg-Ag-Sn alloys at elevated temperatures.

Abstract Image

HCP Mg-Ag-Sn 合金中扩散系数的测量和原子流动性的评估
可靠的热力学和动力学数据库对于设计和开发新型镁(Mg)合金在汽车和航空航天工业中的高温应用至关重要。本研究通过分别在 450、500 和 550 ℃ 下退火的四组三种扩散耦合来研究 HCP Mg-Ag-Sn 合金的扩散行为。采用正向模拟法提取了三种退火温度下的相互扩散系数和杂质扩散系数。确定的扩散系数与先前的文献结果相结合,用于评估镁银锰体系 HCP 相的原子迁移率。这项评估是使用 Thermo-Calc 软件中的 DICTRA 和 TCMG5 热力学数据库进行的。对计算得出的扩散系数和实验得出的扩散系数进行了综合比较,结果非常吻合。在 525 °C 下进行的 18 小时独立扩散耦合实验中观察到的浓度曲线和扩散路径的适当预测也进一步验证了原子迁移率。实验发现,在 HCP Mg 的稳定温度范围内,添加 Sn 和 Ag 都会分别增加 Ag 在 HCP Mg 中的扩散率和 Sn 在 HCP Mg 中的扩散率。加深对 Mg-Ag-Sn 三元体系动力学的理解,对于控制扩散相关特性(如粗化),进而控制 Mg-Ag-Sn 合金在高温下的机械特性至关重要。
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来源期刊
Journal of Phase Equilibria and Diffusion
Journal of Phase Equilibria and Diffusion 工程技术-材料科学:综合
CiteScore
2.50
自引率
7.10%
发文量
70
审稿时长
1 months
期刊介绍: The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.
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