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Superplastic forming of aluminium alloys: report

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Figure

Figure 1 Double-action tool technology in the superplastic forming industries outside of GM [2].
Figure 3 Principle behind the creep-forming process: a) sheet metal placed in the die; b) vacuum, pressure and heat are applied; c) residual stresses make the shell spring back; d) diagram showing stress relaxation that occurs during creep forming [13].
Figure 4 Data for creep deformation in commercial 5000-series alloys are plotted as the logarithm of the Zener- Zener-Hollomon parameter versus the logarithm of modulus-compensated stress [14].
Figure 5 The effect of strain rate on AA5083 tensile curves shape at 450°C, that also shows the transition of deforma-
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