Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 324, Issue 1-2, Pages 219-224Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(01)01315-6
Keywords
plastic instabilities; depth-sensing indentation; Guinier-Preston zones; AI-Zn-Mg and Al-Zn-Mg-Cu alloys
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Plastic instabilities in solid solution Al-Mg and supersaturated Al-Zn-Mg-(Cu) alloys were investigated by depth-sensing microhardness tests. Experimental results show that in the case of Al-Mg alloys the characteristics of the plastic instability depend only on the solute concentration. In the case of age-hardenable Al-Zn-Mg-(Cu) alloys, however, although plastic instabilities were observed during indentation following the quenching, the development of the instability steps is strongly influenced by Guinier-Preston zone formation in the early stage of natural aging. After a certain time, t(i), of aging the steps disappear completely. The value of ti obtained for the Cu-containing alloy was found to be considerably longer than that obtained for the ternary Al-Zn-Mg alloy. This fact - together with the smaller initial rate of hardening in the Cu-containing alloy - indicates that the addition of Cu retards the early part of the decomposition process at room temperature in this alloy system. (C) 2002 Elsevier Science B.V. All rights reserved.
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