Forming limit diagrams of twin-roll cast, rolled and heat-treated AZ31 as a function of temperature and loading rate

Autor:	C. Ullrich, Franz Berge, L. Krüger
Rok vydání:	2014
Předmět:	Materials science Mechanical Engineering Metallurgy Condensed Matter Physics Grain size Forming limit diagram Mechanics of Materials Dynamic recrystallization Formability General Materials Science Texture (crystalline) Magnesium alloy Deformation (engineering) Crystal twinning
Zdroj:	Materials Science and Engineering: A. 614:27-35
ISSN:	0921-5093
DOI:	10.1016/j.msea.2014.07.007
Popis:	The influence of temperature and punch velocity on the forming limit behavior of twin-roll cast, rolled and heat-treated AZ31 was investigated. Therefore, the Nakajima test was performed using an electromechanical testing machine (1 mm/s) and a drop weight test (1700 mm/s) at different temperatures. For investigation of the local strains, the fractured specimens were studied by an optical strain measurement system. The initial Mg–3Al–1Zn–0.3Mn material has a strong basal texture and a recrystallized grain structure with an average grain size of 7 µm. It is shown by the forming limit curves (FLC) that the formability increases with rising temperature. High punch velocity deformation at 1700 mm/s leads to a decrease of formability. Microstructural examinations show that this is caused by high amounts of mechanical twinning and a constraint of dynamic recrystallization (DRX) which are temperature and punch velocity dependent mechanisms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0a72cf0b7dc212f6658136d397bd7d8f https://doi.org/10.1016/j.msea.2014.07.007 Zobrazit plný text záznamu Full Text from ScienceDirect