Grain Refinement and Strengthening Mechanism Analysis of an Ultrahigh Strength Sc(Er)–Zr–7075 Aluminum Alloy

The influence mechanisms of Er and Zr or Sc and Zr addition on the microstructure and mechanical properties of 7075 aluminum alloys were elucidated. Synchronous enhancements in strength and ductility were obtained in 7075S (Sc–Zr–7075) aluminum alloys. The improvement of strength and ductility was m...

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Bibliographic Details
Published in:Physics of metals and metallography 2021-12, Vol.122 (14), p.1597-1604
Main Authors: Jinfeng Leng, Ren, Binghui, Dong, Yunfan, Wu, Hao
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Aluminum alloys
Aluminum base alloys
Analysis
Chemistry and Materials Science
Ductility
Grain refinement
Grain size
Materials Science
Mechanical properties
Metallic Materials
Nucleation
Plates, Aluminum
Scandium
Solidification
Specialty metals industry
Strength and Plasticity
Strengthening
Zirconium
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Summary:The influence mechanisms of Er and Zr or Sc and Zr addition on the microstructure and mechanical properties of 7075 aluminum alloys were elucidated. Synchronous enhancements in strength and ductility were obtained in 7075S (Sc–Zr–7075) aluminum alloys. The improvement of strength and ductility was mainly attributed to grain refinement and Orowan strengthening of Al 3 (Sc,Zr) phase. The grain size of 7075E (Er–Zr–7075) and 7075S alloys are remarkably refined as compared to 7075 aluminum alloy. The lower mismatch between Al 3 (Sc,Zr) phase and α-Al provides more effective heterogeneous nucleation sites for α-Al in the solidification process, and thus the grain refinement effect is more significant. The higher volume fraction and smaller particle size of Al 3 (Sc,Zr) than Al 3 (Er,Zr) phase lead to higher Orowan strength of 7075S aluminum alloy.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X21140143