Second Phase Particle Distribution And Its Effect
On The Formability Of Aluminum Alloys
Author(s)
Z. Chen
Abstract
Aluminum alloys have been increasingly used in the automotive industry for fuel
economy. The existence of second phase particles in aluminum alloys provides
damage nucleation sites during formation processes and limits the formability.
Characterization of second phase particle distribution and its effect on the
formability of aluminum alloys is of great importance.
Distribution of Fe- and Mn-based second phase particles in Al-Mg alloys
AA5182 and AA5754 is captured using microscopy and image analysis. Spatial
tessellation of particle images is conducted to quantify particle distribution, such
as particle size, shape (aspect ratio) and clustering. Large particles are found
more often in AA5182 than AA5754. The obtained particle distribution is then
applied to a so-called damage percolation model to predict formability of both
alloys in stretch flanging.
Keywords: aluminum sheet, ductile fracture, formability, second phase particles,
microstructure, heterogeneity.
1 Introduction
Modern automotive industry instigates more and more usage of new highstrength-
to-weight ratio metal alloys such as aluminum and high strength steel in
the fabrication of structural components. Application of advanced lightweight
alloys contributes efficiently to the effort in reducing emission and promoting
fuel economy in the auto industry. However, compared with traditional steel,
aluminum exhibits limited formability due to ductile fracture caused by the
existence of second phase particles. Experimental study showed that distribution
of second phase particles in aluminum alloys is strongly inhomogeneous [1],
Keywords
aluminum sheet, ductile fracture, formability, second phase particles,
microstructure, heterogeneity.
Related Book
Other papers in this volume
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