TY - JOUR
T1 - Dynamic recrystallisation and superplasticity in pure aluminium with zirconium addition
AU - Katsas, S.
AU - Dashwood, R.
AU - Grimes, R.
AU - Jackson, M.
AU - Todd, G.
AU - Henein, H.
PY - 2007/1/25
Y1 - 2007/1/25
N2 - When commercial superplastic aluminium alloys were first under development it was concluded that to be successful the alloy should contain both a solid solution addition and a dispersion of fine, thermally stable dispersoids. In contrast to early beliefs, the present work demonstrates that a simple Al–1 wt.%Zr alloy can exhibit good superplastic performance despite the absence of a solid solution element. The starting material was in the form of ∼1 mm diameter particles produce via impulse atomisation that conferred a solidification rate ∼103 K s−1. After extrusion consolidation, heat treatment to produce a fine distribution of metastable Al3Zr precipitates, and rolling, the resulting sheet exhibited superplastic ductilities in excess of 500% at a strain rate of 10−1 s−1. An EBSD study of the deformation behaviour demonstrated substantial grain refinement resulting from dynamic recrystallisation.
AB - When commercial superplastic aluminium alloys were first under development it was concluded that to be successful the alloy should contain both a solid solution addition and a dispersion of fine, thermally stable dispersoids. In contrast to early beliefs, the present work demonstrates that a simple Al–1 wt.%Zr alloy can exhibit good superplastic performance despite the absence of a solid solution element. The starting material was in the form of ∼1 mm diameter particles produce via impulse atomisation that conferred a solidification rate ∼103 K s−1. After extrusion consolidation, heat treatment to produce a fine distribution of metastable Al3Zr precipitates, and rolling, the resulting sheet exhibited superplastic ductilities in excess of 500% at a strain rate of 10−1 s−1. An EBSD study of the deformation behaviour demonstrated substantial grain refinement resulting from dynamic recrystallisation.
KW - Superplasticity
KW - Aluminium alloy
KW - Dynamic recrystallisation
KW - Rapid solidification
KW - Zirconium
U2 - 10.1016/j.msea.2006.08.096
DO - 10.1016/j.msea.2006.08.096
M3 - Article
VL - 444
SP - 291
EP - 297
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -