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Characterization of Plastic Instability Steps Occurring in Depth-sensing Indentation Tests by N.Q Chinh; Gy Horváth; Zs Kovács; J Lendvai is a Engineering article available to read on EtoBox.

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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 t i 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.

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Author

N.Q Chinh; Gy Horváth; Zs Kovács; J Lendvai

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0921-5093)

Published

2002

Language

EN

Field

Engineering (Physical Sciences)