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:
This is an initial report of a multi-technique study on the effect of Mg alloying on solute-vacancyinteractions during the early stages of ageing of dilute 2xxx Al-Cu-Mg alloys so as to betterunderstand the early rapid hardening (RH) that occurs in certain compositions of these alloys andthe more general phenomena of secondary hardening (SH) at ambient temperatures. Therefore, RHat 150 °C and SH at room temperature from the as-quenched condition and after 60 sec ageing at150 °C were studied in Al-1.1Cu and Al-1.1Cu-0.5Mg (at. %) variously by positron annihilationlifetime spectroscopy (PALS), coincidence Doppler broadening (CDB) spectroscopy and atomprobe tomography (APT) and monitored by Vickers hardness measurements. The present resultsindicate that Cu-Cu, Mg-Mg and Cu-Mg clusters are formed in the ternary alloy already in the asquenchedstate and that they persist during ageing at 150 °C. The fraction of the solutes Cu and Mgthat were associated with vacancies after ageing was increased 10-fold and double, respectively andthe strength of the Cu clustering is enhanced greatly after 60 sec at 150 °C
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.197.pdf
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