Dislocation studies on deformed single crystals of high-purity iron using positron annihilation: Determination of dislocation densities
Yong-Ki ParkDepartment of Material Science and Engineering, Northwestern University, Evanston, Illinois 60201J. T. WaberDepartment of Material Science and Engineering, Northwestern University, Evanston, Illinois 60201M. MeshiiDepartment of Material Science and Engineering, Northwestern University, Evanston, Illinois 60201C.L. SneadDepartment of Material Science and Engineering, Northwestern University, Evanston, Illinois 60201C. G. ParkDepartment of Material Science and Engineering, Northwestern University, Evanston, Illinois 60201
1986en
ABI
Аннотация
A new method for determining the total number of dislocations per unit area, as well as the fraction of screw and edge components, is presented. Single-crystal specimens which have been (a) bent over a mandrel, (b) cold rolled at room temperature, and (c) deformed in tension at 200 K have been studied. Etch pits were studied in connection with this work and were found to be primarily of the 〈111〉 type. The density of emergent dislocations as determined by the etch pits was found to be smaller than the number determined by the positron-annihilation technique.
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