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不同Mg/Si比的Al-Mg-Si-Zn合金析出相结构演变和时效硬化行为
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1.湖南大学材料科学与工程学院;2.海南大学精密仪器高等研究中心,海洋材料表征技术创新研究院,皮米电镜中心,海南 海口 570228;3.长安大学现代工程训练中心;4.海南大学精密仪器高等研究中心,海洋材料表征技术创新研究院,皮米电镜中心

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国家自然科学基金资助(项目号U23A20392, 52001119, 52101007)


Evolution of precipitate structure and age-hardening behavior of Al-Mg-Si-Zn alloys with different Mg/Si ratios
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1.College of Materials Science and Engineering,Hunan University,Changsha;2.Modern Engineering Training Center,Chang’an University,Xi’an

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    摘要:

    添加合金元素是改善Al-Mg-Si合金性能及微观结构的有效方法。本工作利用力学性能测试、差示扫描量热分析及高角环形暗场成像扫描透射电镜技术研究了不同Mg/Si比的Al-Mg-Si-Zn合金在时效过程中的析出硬化行为。结果发现,Zn元素的添加对富Mg的Al-Mg-Si合金峰值时效硬度和屈服强度提升明显。Al-Mg-Si-Zn合金在时效过程中存在三条β"Zn相向后期相(β'Zn相或Q'Zn相)转变的路径,且富Mg合金更容易发生β"Zn相向β'Zn相的转变,而富Si合金则更倾向于发生β"Zn相向Q'Zn相的转变。在早期和峰值时效阶段,Zn原子会占据析出相内部能量有利的原子位点。在过时效阶段,Zn原子会逐渐从析出相内部扩散并偏聚到析出相与Al基体的界面处。

    Abstract:

    Adding alloying elements is an effective strategy to improve the properties and microstructure of Al-Mg-Si alloys. In this work, mechanical properties test, differential scanning calorimetry, and high-angle annular dark-field scanning transmission electron microscopy were used to study the precipitation hardening behavior of Al-Mg-Si-Zn alloys with different Mg/Si ratios. The results show that the addition of Zn significantly increases the peak-aging hardness and yield strength of Mg-rich Al-Mg-Si alloys. There are three pathways of the β"Zn phase to the late-stage phases (β'Zn phase or Q'Zn phase) transformation during aging of Al-Mg-Si-Zn alloys. The Mg-rich alloy is more likely to undergo transition from the β"Zn phase to the β'Zn phase, while the Si-rich alloy is more prone to experience transition from the β"Zn phase to the Q'Zn phase. During the early- and peak-aging stages, the Zn atoms enter the precipitates and occupy the energetically favorable atomic sites. During the over-aging stage, the Zn atoms will gradually diffuse from the precipitate bulk to the interface between the precipitates and the Al-matrix.

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雷潘敏,胡谢君,赖玉香,向雪梅,牛凤姣,陈江华.不同Mg/Si比的Al-Mg-Si-Zn合金析出相结构演变和时效硬化行为[J].稀有金属材料与工程,,().[Lei Panmin, Hu Xiejun, Lai Yuxiang, Xiang Xuemei, Niu Fengjiao, Chen Jianghua. Evolution of precipitate structure and age-hardening behavior of Al-Mg-Si-Zn alloys with different Mg/Si ratios[J]. Rare Metal Materials and Engineering,,().]
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  • 收稿日期:2024-06-30
  • 最后修改日期:2024-11-20
  • 录用日期:2024-12-02
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