6 On Trays A B C and D move atoms along the surface by pushing with a pencil as

6 on trays a b c and d move atoms along the surface

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6. On Trays A, B, C and D, move atoms along the surface by pushing with a pencil as in Figures 10 and 11. Sketch each of the planes and indicate the easy directions on each plane over short single steps and long distances. How many easy directions can be found on each plane? Over which plane is atom movement most easy? 7. Construct a twin as shown in Figures 12 to 15. Notice the fault in the stacking on all sides. (Students can return to the lab to use the ball models at a later date.) Topic B Dislocation models (Chapter 4, Section 4.4) It is essential that care be taken in handing these delicate models. All examination will be supervised and explained by a member of staff or a demonstrator. 1. Foam rubber block to show the displacement caused by edge and screw dislocations. 2. Ball and stick models of edge, screw and loop dislocations. 3. Movement of dislocations as modeled by suspended magnets. 4. Bubble raft demonstration of dislocation movement. 5. Computer simulation of dislocation movement. No sketches nor write-up are required for the dislocation models. Reference W.D.Callister, Jr., Materials Science and Engineering An Introduction , 4 th Ed., Wiley & Sons, 1997
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  • Spring '17
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