晶界偏析抑制纳米晶钒合金的烧结

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialia Pub Date : 2025-07-12 DOI:10.1016/j.mtla.2025.102486

Daniel S. Ng , Christopher A. Schuh

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引用次数: 0

摘要

晶界加速质量输运，改善粉末烧结性能。在这里，我们探索了机械研磨纳米晶钒的烧结，与粗晶钒相比，它的烧结速度更快，并且具有与晶间迁移相关的低活化能的特点。这种细小的晶粒结构也可以通过溶质偏析来稳定，但发现加入有利于稳定晶界的强偏析物质通常不利于钒粉的致密化。我们讨论了竞争效应，并提出了一个动力学论点，解释烧结的抑制是溶质基阻碍晶界扩散途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Grain boundary segregation suppresses sintering in nanocrystalline vanadium alloys

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Grain boundary segregation suppresses sintering in nanocrystalline vanadium alloys

Grain boundaries (GBs) can accelerate mass transport to improve powder sintering. Here we explore the sintering of mechanically milled nanocrystalline vanadium, which is accelerated as compared to coarse-grained vanadium, and is characterized by a low activation energy associated with intergranular transport. Such a fine grain structure can also be stabilized by solute segregation, but the addition of strongly segregating species that are favorable for stabilizing grain boundaries are found to be generally detrimental to the densification of vanadium powders. We discuss competing effects, and advance a kinetic argument explaining the suppression of sintering as a solute-based obstruction of grain boundary diffusion pathways.

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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).