中国物理B ›› 2009, Vol. 18 ›› Issue (8): 3500-3507.doi: 10.1088/1674-1056/18/8/061

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Influence of solute cloud and precipitates on spatiotemporal characteristics of Portevin-Le Chatelier effect in A2024 aluminum alloys

孙亮, 张青川, 曹鹏涛   

  1. CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China
  • 收稿日期:2008-10-12 修回日期:2008-12-01 出版日期:2009-08-20 发布日期:2009-08-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10872189 and 10732080).

Influence of solute cloud and precipitates on spatiotemporal characteristics of Portevin-Le Chatelier effect in A2024 aluminum alloys

Sun Liang(孙亮), Zhang Qing-Chuan(张青川)†, and Cao Peng-Tao(曹鹏涛)   

  1. CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China
  • Received:2008-10-12 Revised:2008-12-01 Online:2009-08-20 Published:2009-08-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10872189 and 10732080).

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摘要： In this paper, solute concentration and precipitate content in A2024 aluminum alloy are adjusted by solution treatment (ST) at different temperatures and tensile experiments on these treated specimens are carried out. It is found that the temperature of solution treatment (ST temperature) has a remarkable influence on the amplitude of the serrated flow and the propagation characteristics of shear bands. These results are due to the effects of solute atoms and precipitates on dynamic strain aging (DSA). When ST temperature is higher than 300~℃, solute concentration is relatively high and solute cloud is a key factor of DSA. When ST temperature is lower than 300~℃, precipitate content is relatively high and the mechanism of DSA is determined by precipitates.

Abstract: In this paper, solute concentration and precipitate content in A2024 aluminum alloy are adjusted by solution treatment (ST) at different temperatures and tensile experiments on these treated specimens are carried out. It is found that the temperature of solution treatment (ST temperature) has a remarkable influence on the amplitude of the serrated flow and the propagation characteristics of shear bands. These results are due to the effects of solute atoms and precipitates on dynamic strain aging (DSA). When ST temperature is higher than 300 ℃, solute concentration is relatively high and solute cloud is a key factor of DSA. When ST temperature is lower than 300 ℃, precipitate content is relatively high and the mechanism of DSA is determined by precipitates.

Key words: aluminum alloy, Portevin-Le Chatelier effect, dynamic strain aging, solution treatment, precipitate particle

中图分类号:  (Deformation, plasticity, and creep)

  • 81.40.Lm
62.20.F- (Deformation and plasticity) 64.75.-g (Phase equilibria) 81.40.Cd (Solid solution hardening, precipitation hardening, and dispersion hardening; aging)