TEM Observation for Precipitates Structure of Aged Al-Zn-Mg Series Al Alloys Addition of Cu or Ag

Katsumi Watanabe; Susumu Ikeno; Tomoo Yoshida; Satoshi Murakami; Kenji Matsuda

doi:10.4028/www.scientific.net/AMR.922.791

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TEM Observation for Precipitates Structure of Aged Al-Zn-Mg Series Al Alloys Addition of Cu or Ag

Abstract:

Al-Zn-Mg alloy has been known as one of the aluminum alloys with the good age-hardening ability and the high strength among commercial aluminum alloys. The mechanical property of the limited ductility, however, is required to further improvement. In this work, three alloys, which were added Cu or Ag into the Al-Zn-Mg alloy, were prepared to compare the effect of the additional elements on the aging behavior. Ag or Cu added alloy showed higher maximum hardness than Ag or Cu free alloy. The η’ phase were observed in all alloys peak-aged at 423K. According to addition of Ag or Cu, the number density of the precipitates increased than Ag or Cu free alloy.