The microstructure, texture and mechanical properties of AS-ECAE Interstitial-free steel and copper

Gazder, Azdiar A and Florian, H Dalla Torre and Christopher, H J Davies and Pereloma, Elena V (2011) The microstructure, texture and mechanical properties of AS-ECAE Interstitial-free steel and copper. In: VI International Conference on Mechanochemistry and Mechanical Alloying (INCOME 2008), 1-4 December 2008, NML Jamshedpur, India.

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Abstract

A comparison between the microstructure, texture and mechanical properties of bcc interstitial-free (IF) steel and fcc copper (Cu) for up to N = 8 passes Equal Channel Angular Extrusion (ECAE) via route BC processing was undertaken. Transmission Electron Microscopy (TEM) and Electron Back-Scattering Diffraction (EBSD) studies revealed that the deformation microstructures of both metals evolves from low-angled microbands and dislocation cells after N=2 passes towards more equiaxed, homogeneous subgrain/grain structures comprising higher-angles of misorientation after N = 8 passes. In both metals, the percentage rise in Σ3 and random boundaries are attributed to mechanisms that favour low-energy boundary configurations during ECAE. Texture evolution involves gradual changes in individual component strengths during multi-pass ECAE. The bcc and fcc textures are correlated by interchanging the Miller indices of the slip plane and slip direction between the two cubic crystal systems. The uniaxial tensile curves of both materials are representative of significant cold-working and depict higher 0.2% proof stresses, a small period of uniform elongation, necking and lastly, failure via geometrical softening. Constitutive modelling suggests that rather than a change in deformation mechanism, the preservation of ductility up to N = 8 passes is associated with an increase in the mean free path of dislocations; with slip via dislocation glide remaining as the dominant carrier of plastic strain in both metals.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:http://eprints.nmlindia.org/5084
Uncontrolled Keywords:Equal Channel Angular Extrusion (ECAE); Equal Channel Angular Pressing (ECAP); Transmission Electron Microscopy (TEM); Electron Back-Scattering Diffraction (EBSD); Texture
Divisions:Metal Extraction and Forming
ID Code:5084
Deposited By:Mr. G Shailendra Kumar
Deposited On:03 May 2012 10:04
Last Modified:03 May 2012 10:04
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