Rev.Adv.Mater.Sci.(RAMS)
No 3, Vol. 10, 2005, pages 235-238

EFFECTS OF THE NUMBER OF ECAP PASSES AND ECAP ROUTE ON THE HETEROGENEITY
IN MECHANICAL PROPERTIES ACROSS THE SAMPLE FROM ULTRAFINE COPPER

A.I. Korshunov, I.I. Vedernikova, L.V. Polyakov, T.N. Kravchenko, A.A. Smolyakov and V.P. Soloviev

Abstract

Annealed copper was processed by eight passes of equal-channel angular pressing (ECAP) using two routes, BC and C. Pressed samples had a square section with a side length of 8 mm. Mechanical properties at tension (conventional yield strength, tensile strength, elongation and contraction) were determined at 9 points across the sample using small-size specimens, 1.5 mm in diameter, cut out along the pressing direction. Heterogeneity in the mechanical properties across the sample was determined based on the value of the variation coefficient. Heterogeneity in all the mechanical properties after eight ECAP passes was found to be higher for route BC than for route C.

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