Tailoring microstructure and mechanical properties of 6063 aluminium alloy for lightweight structural parts

Witold Chromiński , Mariusz Kulczyk , Marcin Siwek , Małgorzata Lewandowska

Abstract

In this work, an attempt has been made to improve the mechanical strength of 6063 aluminium alloy and thus its lightness via combination of severe plastic deformation (grain size refinement) and heat treatment (precipitation hardening). 6063 aluminium alloy was chosen as the best material for lightweight structures, where mass reduction is important, because of its high extrudability. Samples were hydrostatically extruded (HE) in supersaturated condition and subsequently subjected to an aging process. HE brings about significant grain size refinement well below 1 micron. The influence of aging parameters such as time and temperature on mechanical properties evolution of extruded material was determined. The microstructure of ultrafine grained (UFG) alloy was investigated using transmission electron microscopy. The average grain diameter and grain boundary misorientation angles (using Kikuchi lines) were measured. Mechanical properties were examined in microhardness and tensile tests. The results have shown that it is possible to combine grain boundary and precipitation strengthening and obtain ultrahigh strength in 6xxx series alloys. Additionally, heat treatment of UFG samples causes an increase in ductility measured in tensile tests, which is rather poor in severely deformed materials. To prove advantages of UFG aged samples for lightweight applications, finite element modelling was performed to compare the mass of chair elements made of coarse and ultrafine grained material. Simulations were made for the same stresses applied. It has been shown that if the chair was made of UFG aluminium alloy the mass reduction would be approximately 30 %. © (2013) Trans Tech Publications, Switzerland.

Author Witold Chromiński (FMSE / DMD)
Witold Chromiński,,
- Division of Materials Design
, Mariusz Kulczyk - Instytut Wysokich Ciśnień Polskiej Akademii Nauk (Instytut Wysokich Ciśnień Polskiej Akademii Nauk)
Mariusz Kulczyk,,
-
, Marcin Siwek (FMSE / DMD)
Marcin Siwek,,
- Division of Materials Design
, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
Pages388-392
Book Materials Science Forum, Materials Science Forum, 2013, ISBN 9783037857663, 388-392 p.
ASJC Classification2210 Mechanical Engineering; 2211 Mechanics of Materials; 3104 Condensed Matter Physics; 2500 General Materials Science
DOIDOI:10.4028/www.scientific.net/MSF.765.388
Languageen angielski
Score (nominal)0
ScoreMinisterial score = 0.0, 07-07-2020, MonographChapterAuthor
Publication indicators Scopus Citations = 1; WoS Citations = 1; GS Citations = 1.0; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 0.334
Citation count*1 (2015-05-03)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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