Enhanced Formability of Ultrafine-Grained Aluminum Blanks by Local Heat Treatments

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Details zur Publikation

Autorinnen und Autoren: Merklein M, Vogt U
Zeitschrift: Key Engineering Materials
Jahr der Veröffentlichung: 2009
Band: 410-411
Seitenbereich: 169-176
ISSN: 1013-9826
eISSN: 1662-9795


High strength aluminum blanks can be obtained by grain-refinement due to an Accumulativ Roll Bonding (ARB) process, in which two sheets are iteratively brushed, stacked on top of each other and subsequently rolled together. The high shear stresses during the rolling cycles result in an ultrafine-grained microstructure with an average grain size ranging between 200 to 1000 nm. Whereas the grain-refinement causes a drastically increased strength of the aluminum material, the formability of the ARB-blanks made of industrially used aluminum alloys such as the AA6016 deteriorates to the same degree as the strength rises. In this context, a local heat treatment of the ARB-blank reducing the material's strength and increasing its ductility in specific zones will allow to recover the blank's formability again. The research work presented in this paper studies the microstructural effects of a short-term heat treatment on the mechanical properties of ARB-blanks made of AA6016. Experimental investigations including hardness measurements, tensile tests as well as microscopic analyses show that heat treatments of only several seconds already result in significant increases of the material's ductility and decreases of the material's strength. By applying these microstructural mechanisms in terms of a specific heat treatment layout, functional gradients of strength and ductility adapted to the succeeding forming operation can be setup significantly enhancing the ARB-blank's formability.

FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Merklein, Marion Prof. Dr.-Ing.
Lehrstuhl für Fertigungstechnologie

Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


E Lightweight Materials
Exzellenz-Cluster Engineering of Advanced Materials


Merklein, M., & Vogt, U. (2009). Enhanced Formability of Ultrafine-Grained Aluminum Blanks by Local Heat Treatments. Key Engineering Materials, 410-411, 169-176. https://dx.doi.org/10.4028/www.scientific.net/KEM.410-411.169

Merklein, Marion, and Uwe Vogt. "Enhanced Formability of Ultrafine-Grained Aluminum Blanks by Local Heat Treatments." Key Engineering Materials 410-411 (2009): 169-176.


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