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铝合金晶粒细化过程中溶质抑制形核区的同步辐射成像研究

发布日期:2022-02-18   作者: 上海市先进高温材料及其精密成形重点实验室   点击次数: 370

国家自然科学基金大科学装置联合基金资助项目(U1832183)

在铝合金熔体中添加晶粒细化剂促进形核是获得细晶组织的有效手段,但与此同时,细化剂的形核效率却相当低下,只有~1%的形核粒子能成为有效形核核心。本项目以影响细化剂形核效率的关键因素“溶质抑制形核区”(SSNZ)为研究对象,利用同步辐射X射线成像技术实时观察添加铝钛硼晶粒细化剂的铝铜合金凝固过程,采用图像识别和机器学习方法分析获得的凝固图像,通过计算机软件自动挖掘与凝固过程相关的形核位置、形核数量、形核过冷度以及SSNZ大小等关键数据。在此基础上,阐明不同凝固条件下SSNZ的演变规律及其在形核粒子集群选择性形核中的作用,揭示合金溶质含量变化及中毒效应对SSNZ和形核效率的影响,为相关理论模型提供实验验证,并为改善细化剂的形核效率提供指导。

Al-15Cu合金凝固过程的同步辐射X射线原位观察(上海光源X射线成像及生物医学应用光束线站)

  

(a) Al-20Zn合金凝固过程的同步辐射X射线原位观察                              (b) Al-20Zn-0.2Zr合金凝固过程的同步辐射X射线原位观察

 

(a) 生长晶粒周围的溶质抑制形核区(SSNZ)                             (b) Al-15Cu合金凝固过程中的晶体生长与溶质扩散


项目研究成果列表

[1] An in situ investigation of the solute suppressed nucleation zone in an Al-15 wt% Cu alloy inoculated by Al-Ti-B

Jia, Yiwang; Huang, Haijun; Fu, Yanan; Zhu, Guoliang; Shu, Da; Sun, Baode; StJohn, D H

Scripta Materialia, 2019, 167: 6-10. 


[2] In situ Investigation of the Heterogeneous Nucleation Sequence in Al-15 Weight Percent Cu Alloy Inoculated by Al-Ti-B  

Jia, Yiwang; Wang, Donghong; Fu, Yanan; Dong, Anping; Zhu, Guoliang; Shu, Da; Sun, Baode  

Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2019, 50A(4): 1795-1804. 

[3] Grain size prediction and investigation of 7055 aluminum alloy inoculated by Al-5Ti-1B master alloy  
Jia, Yiwang; Wang, Shuncheng; Shu, Da  
Journal of Alloys and Compounds, 2020, 821: 0-153504. 

[4] Niobium nanoparticle-enabled grain refinement of a crack-free high strength Al-Zn-Mg-Cu alloy manufactured by selective laser melting 
Xiao, Fei; Wang, Shubin; Wang, Yixiao; Shu, Da; Zhu, Guoliang; Sun, Baode; StJohn, David  
Journal of Alloys and Compounds, 2022, 900: 0-163427.  

[5] In Situ Investigation of Si-Poisoning Effect in Al–Cu–Si Alloys Inoculated by Al–5Ti–1B  
Jia, Yiwang; Song, Dongfu; Zhou, Nan; Zheng, Kaihong; Fu, Yanan; Shu, Da  
Acta Metallurgica Sinica (English Letters), 2022, 35(1): 146-156. 

[6] In Situ Investigation of the Solidification of Al-20 wt.% Zn Alloys Inoculated by Al-5Ti-1B  
Jia, Yiwang; Liu, Zhengcai; Song, Dongfu; Xia, Peng; Zhou, Nan; Zheng, Kaihong; Fu, Yanan; Shu, Da  
Journal of Materials Engineering and Performance, 2021, 30(8): 5742-5749.  

[7] Ultrasound cavitation induced nucleation in metal solidification: An analytical model and validation by real-time experiments  
Huang, Haijun; Qin, Ling; Tang, Haibin; Shu, Da; Yan, Wentao; Sun, Baode; Mi, Jiawei  
Ultrasonics Sonochemistry, 2021, 80: 0-105832.  

[8] The growth restriction effect of TiCN nanoparticles on Al-Cu-Zr alloys via ultrasonic treatment  
Jia, Yiwang; Song, Dongfu; Zhou, Nan; Zheng, Kaihong; Fu, Yanan; Shu, Da  
Ultrasonics Sonochemistry, 2021, 80: 0-105829. 

[9] 微量硼添加对Al-5Ti-1B细化铝合金效果的影响(英文)  
肖飞; 吴明旭; 王一笑; 周文哲; 王舒滨; 汪东红; 祝国梁; Michael Jiang; 疏达; 米家伟; 孙宝德  
Transactions of Nonferrous Metals Society of China, 2021, 1-18.