The effect of microalloying additions of Au on the natural ageing of Al–Cu

✍ Scribed by B. Klobes; O. Balarisi; M. Liu; T.E.M. Staab; K. Maier

• Book ID: 103999153
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 252 KB
• Volume: 58
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2010.07.059

✦ Synopsis

The influence of microalloying additions of Au to the binary Al-Cu system is investigated utilizing hardness measurements, positron annihilation spectroscopy and X-ray absorption spectroscopy. No room temperature ageing could be observed in the case of the ternary Al-Cu-Au alloy. Instead, quenched-in vacancies were trapped by Au atoms and thus could not catalyse the decomposition of the alloy. However, artificial ageing dissolves the complexes of Au and vacancies. A comparison between experimental and calculated absorption spectra shows that Au atoms did not agglomerate significantly during either natural or artificial ageing.