7085铝合金中η相的准晶结构生长路径研究

7085铝合金中η相的准晶结构生长路径研究

张云飞，周凯旋^*，孙国胜，吕世隆，刘吉梓^*

（1. 南京理工大学材料科学与工程学院/格莱特研究院，纳米异构中心，江苏 南京 210094；2. 南京大学医学院，南京鼓楼医院，南京生物与医学电子显微技术研究中心，江苏 南京 210093）

摘 　要　　近些年，陆续有研究发现铝合金中的MgZn₂相可以形成准晶结构，但对准晶生长机制的研究仍较为有限。本研究通过高分辨扫描透射电子显微技术（high resolution transmission electron microscope， HRSTEM）揭示了7085铝合金中η相（MgZn₂）准晶化的生长机制。实验结果表明，η相的准晶化演化存在以下两种路径：（1）部分准晶化结构：析出相在生长过程中通过五边形畴及六方缺陷（H单元）调节应变能，逐步形成具有五重对称性的准晶亚结构，元素面分布分析表明，Cu在相界偏析形成夹板结构通过应力调控驱动准晶化；（2）完全准晶化结构：五边形畴直接由基体析出，通过菱形（R）单元与重叠的菱形（R-R）单元的彭罗斯非周期拼砌形成长程准晶结构。

关键词　　7085铝合金；彭罗斯平铺；HRSTEM；准晶

中图分类号：TG146.21；TG115.21　　

文献标识码：A Doi:10.3969/j.issn.1000-6281.2025.06.004

Research on the quasicrystal growth path of the η phase in 7085 aluminum alloy

ZHANG Yunfei¹，ZHOU Kaixuan^2*，SUN Guosheng¹，LÜ Shilong¹，LIU Jizi^1，2*

（1. Nano and Heterogenous Materials Center, School of Materials Science and Engineering / Herbert Gleiter Institute, Nanjing University of Science and Technology, Jiangsu Nanjing 210094；2. Nanjing Research Center for Biomedical Electron Microscopy (NRC-BEM), Nanjing Drum Tower Hospital Medical School, Nanjing University, Nanjing Jiangsu 210093 , China）

Abstract　　In recent years, studies have reporated that the η phase (MgZn₂) in aluminum alloys can exhibit quasicrystalline structures. However, the mechanism governing quasicrystal growth remains insufficiently understood. This study investigated the quasicrystallization mechanism of the η phase in 7085 aluminum alloy using high-resolution scanning transmission electron microscopy (HRSTEM). The results revealed two distinct growth pathways for the η phase quasicrystallization. (1) Partial quasicrystallization structure: During precipitate growth, strain energy is regulated through the formation of pentagonal domains and hexagonal defects (H-units), gradually evolving into quasicrystalline substructures with fivefold symmetry. Elemental maps indicated Cu segregation at the phase boundary, forming a core-shell structure that drove quasicrystallization via stress modulation. (2) Complete quasicrystallization structure: Pentagonal domains directly precipitated from the matrix, and long-range quasicrystalline structures formed through Penrose-type aperiodic tiling of rhombic (R) units and overlapping rhombic (R-R) units.

Keywords　　7085 aluminum alloy; Penrose tiling; HRSTEM; quasicrystalline

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