Journal
PHYSICS LETTERS A
Volume 353, Issue 1, Pages 98-100Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2005.12.023
Keywords
microstructure; arc spot; motion; CuCr alloy
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The motion of vacuum arc spots on nanocrystalline and coarse-grained CuCr25 alloys were observed by a digital high speed video camera and SEM. Experimental results show that without an external magnetic field a spot can move a long distance in a direction and leave a long straight arc trace (50-100 mu m) on the surface of nanocrystalline CuCr25 cathode. This kind of spot motion can be defined as sub-directional motion. The spot motion is totally random and restricted on coarse Cr particles for coarse-grained CuCr25 cathode. Arc spots move sub-directionally and more easily on nanocrystalline cathode maybe results from an active surface formed by the special electronic structure due to Cu-Cr internal electric field. (c) 2005 Elsevier B.V. All rights reserved.
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