Image icon  Fatigue striations on an aluminium alloy 7475 fracture surface

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Description: SEM micrograph of an underaged aluminium alloy 7475 subjected to fatigue loading in a saltwater environment. The fatigue striations, which correspond to the crack advance for each loading cycle, are clearly visible on the left of the image. The right-hand side of the surface corresponds to the fast fracture of the material when it could no longer support the applied load.
Keywords: aluminium • zinc • magnesium • copper • 7475 • fracture surface • fatigue • striations • SEM • micrograph
Categories: Science approaches > Deformation & failure > Fatigue
Science approaches > Strengthening mechanisms > Precipitation (age) hardening
Materials > Metals & alloys > Aluminium & alloys
Processes > Thermal treatments > Ageing
Product Forms > Flat > Plate
Testing, analysis & experimentation > Mechanical testing
Testing, analysis & experimentation > Microscopy
Created by: Materials e-Learning Technologies
License: This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales).
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Date created: 18 September 1989
Date added: 10 October 2009
Resource ID: 2255