Abstract
An instrumented Charpy impact test was made at temperatures from -196° to 200°C on 5083 alloy cold rolled by 20% in the crack propagating direction. The total impact energy absorbed at a moment of impact is decreased by about 20 to 30% in a temperature range from -100° to 0°C paticularly at -100°C by cold roll hardening. A remarkable laminated fracture behavior and an obscure effect of cold roll hardening are found at -196°C. These behaviors are intensified in particular directions in the rolled alloy. The maximum fracture load of the cold rolled alloy remarkably increases at -196°C, but slightly decreases at 0°C or above. The maximum fracture load at a moment of impact has a nearly linear relationship to the test temperature. The abrupt depression of the total energy absorbed at a moment of impact is independent of the maximum load.
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