ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The commercial 7xxx series Al alloys are based on medium strength Al-Zn-Mg and high strengthAl-Zn-Mg-Cu systems. The medium strength alloys are weldable, whilst the high strength alloys are nonweldable.On the other hand, the Cu-free, weldable alloys suffer from poor SCC resistance. It is the purpose ofthis article to provide quantitative data and microstructural analysis to demonstrate that small additions ofeither Ag or Sc to Al-Zn-Mg and Al-Zn-Mg-Cu alloys bring about very significant improvement in SCCresistance and weldability, respectively. The improvement in SCC resistance of the Cu-bearing alloys due toover aging and retrogression and reaging (RRA) is further discussed in light of a similar improvement in theSCC resistance of these alloys, when peak aged, due to Ag and Sc additions
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.315.pdf
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