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:
During age-hardening of certain Al-Zn-Mg-Cu alloys, a 90% hardness increase can occur with 75seconds. The clustering and precipitation of solute element species during this early rapidhardening (RH) period has been investigated through atom probe tomography, transmission electronmicroscopy, and Vickers hardness measurements. This study has focussed on the effect of copperby analysing three alloys; Al-2.0Zn-1.8Mg-0.7Cu, Al-2.0Zn-1.7Mg-0.2Cu and Al-1.9Zn-1.7Mg(at.%). The early RH reaction in these alloys accounts for up to 70% of the total hardening (peakhardness minus as-quenched hardness) and takes place during the first 60 seconds of ageing. Wereport preferred solute-solute interactions in the as-quenched materials. This quenched-innanostructure acts as a template for subsequent solute clustering, the nature of which we havecorrelated with ageing
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.555.pdf
Permalink