Cable Asylum: Re: Hmmmm.....tick tock, tick, tock by john curl Interconnects, speaker wire, power cords. Ask the Cable Guys.

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Posted by john curl on November 8, 2002 at 01:02:40

In Reply to: Hmmmm.....tick tock, tick, tock posted by John Escallier on November 7, 2002 at 22:59:25:

John Es, I thought that you worked at a physics laboratory. Don't they have a library where you can find books like this? I have my own library, but sometimes I go to the University of California engineering library for info. Do you have a university nearby?
For the record, the reason for this book and this particular chapter is a detailed study of the structure of atomic lattices.
p 314 "A striking property of high-angle grain boundaries in pure polycrystalline copper (99.999% Cu) is that they are mobile in thin-foil electron microscope specimens at room temperature and rotate during observation, prefferentially at the surface intersections, to become more steeply inclined to the plane of the specimen surfaces. This occurs because an inclined boundary traversing a thin-foil specimen experiences a driving force to rotate and become normal to the surfaces of the specimen so as to decrease its area and thus decrease its overall energy."
p315. " The surface intersection along BB (figure 6.18) is very irregular and this irregularity is not a result of electropolishing, but is associated wtih the generation of defects. Figure 6.19(a) shows another portion of the boundary of figure 6.18. Immediately after recording this image, the microscope was switched off and figure 6.19(b) shows the same portion of the boundary after 20 hours at room temperature. Clearly, further rotation of the boundary has occurred."
p316 "In fact, defects of this type are sometimes observed to 'pop out' of the specimen and others to be generated as the boundary continues to move."

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