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Unloading yield effect in a twin-roll-cast Mg-3Al-1Zn alloy

TitleUnloading yield effect in a twin-roll-cast Mg-3Al-1Zn alloy
Publication TypeJournal Article
Year of Publication2015
AuthorsGeng, J, Nie, JF
JournalScripta Materialia
Date Published04
Type of ArticleArticle
ISBN Number1359-6462
Accession NumberWOS:000350182700021
Keywordsactivation volume, aluminum, copper, degrees k, magnesium alloys, Mobile dislocation density, phenomena, point, Single crystals, steel, strain, Stress relaxation, stress-relaxation, yield

The yield point produced by unloading and reloading during tension was observed in a twin-roll-cast Mg-3Al-1Zn alloy. The magnitude of the unloading yield drop increased with increasing strain. Repeated stress relaxation tests were performed to quantitatively analyse the evolution of mobile dislocation density at 20-and 150 degrees C. The exhaustion rate of mobile dislocations at 20 degrees C is 11 times higher than that at 150 degrees C, and is considered to be responsible for the unloading yield effect at 20 degrees C. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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