Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Teaching & Learning Packages Slip in Single Crystals Exercise: 2. 40% deformation
Slip in Single Crystals AimsBefore you startIntroductionSlip geometry: the critical resolved shear stressGeometry during slipSlip in HCP metals 1: slip systemsSlip in HCP metals 2: application of Schmid's LawSlip in HCP metals 3: calculation of forcesSlip in HCP metals 4: observing slip in cadmiumVideo clips of slip in a single cadmium crystalExercise: Determination of the critical resolved shear stress for slip in cadmiumSlip in CCP metalsSummaryQuestionsGoing further
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Exercise: 2. 40% deformation

Scanning electron micrograph of cadmium single crystal after deformation to 40% strain

(Click on image to view larger version.)

After deformation by 40% to l1 = 25 mm, slip steps have appeared on the surface of the crystal. From this micrograph, it is possible to measure an approximate value for φ1, the angle between the slip plane normal and the tensile axis. The image has been taken with the 'narrow edge' of the deformed specimen perpendicular to the electron beam. Try to estimate φ1 from the picture, assuming that the tensile axis and the slip plane normal both lie in the plane of the image. The answer is given on the next page.

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