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Microstructure and High-Strain-Rate Superplasticity of Friction Stir Processed Al-Mg-Sc-Zr Alloy with Low Magnesium Content
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Lin Mei1, Yongbo Sun2, Jing Xie2, Xingpin Chen2
Rare Metal Materials and Engineering | 2026, 55(7) : 1716 - 1723
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Rare Metal Materials and Engineering | 2026, 55(7): 1716-1723
Microstructure and High-Strain-Rate Superplasticity of Friction Stir Processed Al-Mg-Sc-Zr Alloy with Low Magnesium Content
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Lin Mei1, Yongbo Sun2, Jing Xie2, Xingpin Chen2
Affiliations
  • 1.Guangxi Key Laboratory of Multidimensional Information Fusion for Intelligent Vehicles, Guangxi University of Science and Technology, Liuzhou 545006, China
  • 2.International Joint Laboratory for Light Alloys (MOE), Chongqing University, Chongqing 400044, China
Published: 2026-07-10 doi: 10.12442/j.issn.1002-185X.20250070
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The effect of speed ratio factor of friction stir processing on microstructure, microhardness and superplasticity of Al-3Mg-0.1Sc-0.1Zr alloy was investigated. The results show that with the increase in speed ratio factor and heat input, the area of stir zone and the grain size are increased, the dynamic recrystallization is more complete, while the peak hardness in stir zone is decreased. All alloys processed at different speed ratio factors show high-strain-rate superplasticity when they are tensile-tested at 475 ℃ with strain rate of 10-2 s-1. Three types of true stress-true strain curves are observed during tensile tests. The optimal elongation of 2500% is achieved in the alloy processed with a speed ratio factor of 4, and significant strain hardening occurs before tensile fracture, which improves the common softening loss of stress at the later stage of superplastic forming, implying high engineering application value. The outstanding superplasticity is mainly attributed to equiaxed fine grains with excellent thermal stability and a high proportion of high angle grain boundaries. Based on the analysis of grain aspect ratio, cavity evolution, and morphology of fracture profile, the dominant mechanism of superplastic deformation under all speed ratio factors is grain boundary sliding.

Al-Mg-Sc-Zr alloy  /  friction stir processing  /  speed ratio factor  /  high-strain-rate superplasticity  /  grain boundary sliding
Lin Mei, Yongbo Sun, Jing Xie, Xingpin Chen. Microstructure and High-Strain-Rate Superplasticity of Friction Stir Processed Al-Mg-Sc-Zr Alloy with Low Magnesium Content[J]. Rare Metal Materials and Engineering, 2026 , 55 (7) : 1716 -1723 . DOI: 10.12442/j.issn.1002-185X.20250070
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Article Info
doi: 10.12442/j.issn.1002-185X.20250070
  • Receive Date：2025-07-12
  • Online Date：2026-07-29
  • Published：2026-07-10
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History
  • Received：2025-07-12
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Affiliations
    1.Guangxi Key Laboratory of Multidimensional Information Fusion for Intelligent Vehicles, Guangxi University of Science and Technology, Liuzhou 545006, China
    2.International Joint Laboratory for Light Alloys (MOE), Chongqing University, Chongqing 400044, China

Corresponding:

Chen Xingpin, Ph. D., Professor, International Joint Laboratory for Light Alloys (MOE), Chongqing University, Chongqing 400044, P. R. China, Tel: 0086-23-65111547, E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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