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CYCLIC DEFORMATION OF FACE CENTERED CUBIC CRYSTALS AND ITS DISLOCATION INTERACTION MODEL——Ⅱ.DISLOCATION INTERACTION MODEL OF CYCLIC DEFORMATION

JIN Nengyun Shanghai Jiaotong University Jin Nengyun , Department of Materials Science , Shanghai Jiaotong University , Shanghai 200030 , China.Present address:Max-Planck-Institut für Metallforschung , Institut für Physik , 7000 Stuttgart 80 , FRG

金属学报(英文版)

A dislocation interaction model has been proposed for cyclic deformation of fcc crystals.Ac- cording to this model,cyclic stress-strain responses and saturation dislocation structures of a crystal are associated with the modes and intensities of dislocation interactions between slip systems active in the crystal; and,hence,may be predicted by the location of its tensile axis in the crystallographic triangle.This model has successfully explained the different behaviours of double-slip crystals and multi-slip behaviours of some crystals with orientations usually con- sidered as single-slip ones.

关键词: face centered cubic crystal , null , null , null , null

PREPARATION OF ULTRAFINE POWDER OF Fe AND ZrO_2 WITH METASTABLE PHASES BY HIGH POWER LASER BEAMS

XU Huibin TAN Shusong Technische Universitat Berlin , FRG XU Huibin Dipl.-Ing , FB9 , Physikalische Ingenieurwissenschaft , HF1 , TU Berlin , 1000 Berlin 12 , FRG

金属学报(英文版)

The radiation of material surface by high intensity laser beams is used to produce the uhrafine powder of pure Fe and ZrO_2.The morphology,size and phases of the powder were examined by X-ray diffraetometer,scanning electron microscopy as well as transmission electron microscopy.In pure Fe a considerable quantity of γ-phase was found in the powder.In ZrO_2 powder,instead of stable phase,two metastable phases appeared.

关键词: laser beam , null , null

CYCLIC DEFORMATION OF FACE CENTERED CUBIC CRYSTALS AND ITS DISLOCATION INTERACTION MODEL——Ⅰ.CYCLIC DEFORMATION OF COPPER CRYSTALS

JIN Nengyun Shanghai Jiaotong University , Shanghai Jin Nengyun , Department of Materials Science , Shanghai Jiaotong University , Shanghai 200030 , ChinaPresent address:Max-Planck-Institut für Metallforschung-Institut für Physik , Stuttgart 80 , FRG

金属学报(英文版)

Cyclic stress-strain responses and dislocation structure of copper single crystals with various tensile axes were systematically studied and compared with each other.Experimental results reveal that the evolution of microscopic dislocation configurations in a crystal and, accordingly,its macroscopic cyclic behaviours are closely related with its orientation.Re- markable secondary slip has been observed in some crystals with orientations well inside the crystallographic triangle, which are usually considered as single-slip ones.Their cyclio behaviours and dislocation structures at saturation are similar to those of their neighbouring multi-slip crystals.These results have constructed the experimental basis for the newly pro- posed dislocation interaction model Jor cyclic deformation of fee crystals,which will be des- cribed in the second part of this article.

关键词: Copper , null , null , null , null , null , null

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