TEM Observation of Precipitates in Excess Mg-Type Al-Mg-Si Alloys Aged at 473K after Deformation

Abstract:

It has been known that transition metals improve the mechanical property of Al-Mg-Si alloy. The thermo-mechanical treatment is also effective to improve the strength of Al-Mg-Si alloy. In this work, the aging behavior of deformed excess Mg-type Al-Mg-Si alloy including Ag and Cu was investigated by hardness test and TEM observation. The needle-shaped precipitates were aligned in the <001> directions of the matrix in Cu addition alloy at 473K for 3.84ks. The contrast of dislocation was observed in 10% rolled specimens, which increased with amount of deformation. The precipitates were observed on dislocations but not in the matrix for 0.24ks. The precipitates were observed in the matrix with increasing aging time.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 988-991
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.988
• Online since: June 2014
• Authors: Yurie Ogawa, Susumu Ikeno, Yasuharu Yoshimura, Kazuhiko Kita, Kenji Matsuda*
• Keywords: Age-Hardening Behavior, Al-Mg-Si Alloy, TEM

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