Recent development in
aluminum alloys
Sheet Al cars
1916
Premier 1931 Dussenberg
1948
Tasco Ford P2000
152 kg Al BIW 1947
Dyna Panhard
Wrought aluminium alloy compositions
0 1 2 3 4 5 6 7 8 9 10 11 12
Mg Mn Fe Si Cu Zn
1100 2036 3003 4147 5182 6061 6111 7003 7129
Alloying element concentrations (wt%)
0 2 4 6 8 10 12 14 16 18 20 22 24 356
319 380 390
Alloying element concentrations (wt%)
Fe Si Cu Zn
Cast aluminium alloy compositions
Twin-Roll Casting
t = 5 - 6 mm
solutionizing > 530 C quenching
typical manufacturing scheme for AA6XXX body sheet
T4 (T4P)
1 mm
DC Casting
scalping &
homogenization
cold-rolling break-down mill
tandem hot-rolling
600 mm ingot
2 - 5 mm 1 mm
stamping
cold-rolling
Thin-gauge wide strip casting
S setback
Seff
y
1
t1 t1eff t0
0
A B
TEM bright image of and
corresponding diffraction pattern with [001] Al zone axis.
50 nm
020 Al 200 Al
a
0.203nm
1nm
1nm b
High resolution images of the precipitates
(a) the transition ordered phase;
(b) Q(Al5Cu2Mg8Si7) precipitate and its cross section as an insert.
6013 alloy aged 8 hours at 165C
The microstructures contain fine uniformly dispersed rod-shape particles elongated in the <100>Al directions having rectangular or circular cross section. The streaks along <100>Al directions are attributed to shape effect of precipitates. The identification of the phases by SADP is difficult because of the similarity of diffraction patterns from different type of phases (b′, Q′ or S′).
Superplastic elongation of 4850% in Pb-62%Sn alloy (A) after Ahmed and Langdon 1977 and 5500% in the sample of commercial alumnium bronze (B) after Higashi et al.. 1985
Overview of
superplastic behavior as a function of strain rate for aluminium alloys of grain sizes from 15 mm to sub-micron. Included data points for Ni base alloys.
Optical microstructures of alloy AG2 continuously cast and hot rolled at 673K (a) and the same alloy cast to a copper mould AG2A (b)
-3.20 -2.80 -2.40 -2.00 -1.60 -1.20
log epsp [1/s]
1.00 1.20 1.40 1.60 1.80 2.00
log sig [MPa]
773 K 723 K 673 K 623 K
AG1
m = 0.5 log [ Mpa ]
log e [1/s]
Relationship of tensile stress versus strain rate at temperatures 623K, 673K, 723K and 773 K obtained for the alloy AG1 and AG2.
-4.00 -3.60 -3.20 -2.80 -2.40 -2.00 -1.60 -1.20
log epsp [1/s]
0.40 0.80 1.20 1.60 2.00
log sig [MPa]
m = 0.5
623 K 673 K 723 K
773 K
AG1N log [ Mpa ]
log e [1/s]
Superplastic Deformation of Aluminium Alloys
50 mm
