12 Creep Damage Quantification and Post-fire Residual Strength of 5083 Aluminum Alloy 93 Fig. 12.5 (a) 17 MPa, 50, 80, 100, 143 % creep and fracture samples (b) 15 MPa, 100, 133 % creep and fracture samples (c) 14 MPa, 100, 144 % creep and fracture samples (d)Necking region of just-before-fracture sample Fig. 12.6 ESEM images (500 , rolling surface) (a) As received sample "D0 %, and 400 ºC 17 MPa applied stress samples (b) "D50 % (c) "D80%(d) "D100%(e) "D143% Closer inspection of the three-surface microstructures gives more evidence of the creep cavity orientation. Both rolling and transverse surfaces display vertical crack-like cylindrical cavities along the direction of rolling and loading, while roundlike cavities are randomly distributed on the normal surface, as shown in Fig. 12.7. These cavity morphologies on the three surfaces indicate that during high plastic deformation, creep cavities grew from the original spherical shape into the longer, cylindrical shapes along the direction of rolling and loading. Similar cavity morphologies are displayed in all three surfaces
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