| 摘要: |
| 本文通过Sc、Zr微合金化的方法制备了高强Al-Zn-Mg-Cu-Sc-Zr合金，并结合搅拌摩擦加工（FSP）改性获得了超细晶粒。采用金相显微镜（OM）、扫描电子显微镜（SEM）、电子背散射（EBSD）和显微硬度等测试方法，对比分析了FSP对Al-Zn-Mg-Cu-Sc-Zr微观组织和力学性能的影响。研究了Al-Zn-Mg-Cu-Sc-Zr合金在温度为300～450 ℃，应变速率为10-3～10-1 s-1范围内的超塑性变形行为，结合微观组织观察，分析微合金化和搅拌摩擦加工对Al-Zn-Mg-Cu-Sc-Zr合金组织性能的影响。高稳定Al3(Sc, Zr)相的形成和超细晶粒组织使Al-Zn-Mg-Cu-Sc-Zr合金具有高的强度和良好塑性。本文研究结果可为超塑性高强Al-Zn-Mg-Cu系合金的开发奠定基础。 |
| 关键词: 铝合金 微合金化 搅拌摩擦加工 超塑性 微观组织性能 |
| 基金项目:国家自然科学基金青年基金（522***41）；广东省基础与应用基础研究基金（2021A****110062）；广州市基础与应用基础研究基金（2022****1373） |
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| Research on the Microstructure and Properties of High-strength Al-Zn-Mg-Cu-Sc-Zr Alloy Processed by Friction Stir Processing |
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Liu Li Dong Chunlin Xu Wanghui Liu Ruizhe
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School of Naval Architecture and Ocean Engineering, Guangzhou Maritime University, Guangzhou 510700
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| Abstract: |
| In this paper, high strength Al-Zn-Mg-Cu-Sc-Zr alloy was prepared by Sc, Zr microalloying, and ultra-fine grains were obtained by friction stir processing (FSP). The effects of FSP on the microstructure and mechanical properties of Al-Zn-Mg-Cu-Sc-Zr were investigated by Optical Microscopy (OM) , Scanning Electron Microscope (SEM) , Electron Backscatter Diffraction (EBSD) and microhardness measurements. The superplastic deformation behavior of Al-Zn-Mg-Cu-Sc-Zr alloy in the range of 300～450 ℃ and 10-3～10-1 s-1 strain rate was studied. The effect of microalloying and friction stir processing on microstructure and properties of Al-Zn-Mg-Cu-Sc-Zr alloy was analyzed. Al-Zn-Mg-Cu-Sc-Zr alloy has high strength and good plasticity due to the formation of highly stable Al3(Sc, Zr) precipitates and ultrafine grains. The results obtained in this paper can lay a foundation for the development of high strength Al-Zn-Mg-Cu alloy with superplasticity. |
| Key words: aluminum alloy microalloying friction stir processing superplasticity microstructure and property |
