发表机构
Indian Institute of Science（印度科学研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究核壳沉淀中尺寸聚焦现象，用扩展的理论框架和相场模型模拟，揭示其是生长现象，壳生长结束时终止，粗化开始，还为设计窄尺寸分布合金提供指导，壳体积分数和沉淀间距影响尺寸聚焦。
AI 中文摘要
由于具有核壳形态的两种不同相沉淀的铝合金具有增强的抗粗化和/或抗蠕变能力，因此备受当代关注。本文聚焦于近期对Al-Sc-Li和Al-Yb-Li合金的两项研究中一个奇特现象：壳相生长导致尺寸分布变窄。我们使用一个理论框架（将齐纳扩散生长理论扩展到核壳沉淀）和基于相场模型的多沉淀模拟来研究这种尺寸聚焦现象。结果得出了关键的理论见解和具有实际意义的结论。在理论方面，尺寸聚焦是一种生长现象，壳生长结束时它也结束，粗化开始。在实际方面，结果为设计尺寸分布更窄的合金提供了指导：壳体积分数更大和沉淀间距更大的合金中尺寸聚焦更明显。
英文摘要
Due to their enhanced resistance to coarsening and/or creep, aluminium alloys with precipitates of two distinct phases in a core-shell morphology are of great contemporary interest. In this paper, we focus on the curious observation in two recent studies on Al-Sc-Li and Al-Yb-Li alloys that growth of the shell phase leads to a narrowing of the size distribution. We have studied this phenomenon, known as size focusing, using a theoretical framework (which extends Zener's theory of diffusional growth to a core-shell precipitate) and multi-precipitate simulations based on a phase field model. Our results yield key theoretical insights as well as conclusions with practical significance. (a) On the theoretical front, we show clearly that size focusing is a growth phenomenon: it ends when shell growth ends, and coarsening begins. (b) On the practical front, our results offer guidelines for designing alloys with narrower size distributions: size focusing is promoted in alloys with greater shell volume fractions and greater inter-precipitate spacing.
Journal refComput. Mater. Sci. 273 (2026) 114908
DOI：10.1016/j.commatsci.2026.114908
