Rev.Adv.Mater.Sci.(RAMS)
No 5, Vol. 10, 2005, pages 442-446

HCV DEFORMATION - METHOD TO STUDY THE VISCOPLASTIC BEHAVIOR OF THE NANOCRYSTALLINE METALLIC MATERIALS

Lembit Kommel and Renno Veinthal

Abstract

In this paper, the nanocrystalline structure of pure copper was processed by severe plastic deformation (SPD). The tests were carried out on Materials Testing System INSTRON 8516 in three strain controlled regimes by strain amplitude of 1-2% and by the number of cycles up to 30. The main objective of this study is to elaborate a new (non-destructive) testing method - Hard Cyclic Viscoplastic (HCV) deformation to study of the viscoplastic behavior of nanocrystalline (NC) metallic materials. This testing method can be used to investigate the change of mechanical and physical properties, as well as the changes in the micro- and nano structure, the formation of micro- defects and cracks during tension-compression loading in the viscoplastic state of metals. This testing method can be used also to study the stability and viability of the properties of NC metallic materials.

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