Paper Title:
Strain Path Change Effect on Deformation Behaviour of Materials with Low-to-Moderate Stacking Fault Energy
  Abstract

Stacking fault energy (SFE) plays an important role in face centred cubic (f.c.c.) metals and alloys in determining the prevailing mechanisms of plastic deformation. Low SFE metals and alloys have a tendency to develop mechanical twinning, besides dislocation slip, during plastic deformations. Deformation behaviour and microstructure evolution under simple and complex strain paths were studied in 70/30 brass, with small and intermediate grain sizes, which corresponds to a f.c.c. material with low SFE. Simple (rolling and tension) and complex (tension normal to previous rolling) strain paths were performed. The macroscopic deformation behaviour of materials studied is discussed in terms of equivalent true stress vs. equivalent true strain responses and strain hardening rates normalized by shear modulus (dσ/dε)/G as vs. (σ – σ0)/G (σ0 is the initial yield stress of the material and G is the shear modulus). The mechanical behaviour is discussed with respect to dislocation and twin microstructure evolution developed in both, simple and complex strain paths.

  Info
Periodical
Materials Science Forum (Volumes 587-588)
Edited by
António Torres Marques, António Fernando Silva, António Paulo Monteiro Baptista, Carlos Sá, Fernando Jorge Lino Alves, Luís Filipe Malheiros and Manuel Vieira
Pages
420-424
DOI
10.4028/www.scientific.net/MSF.587-588.420
Citation
N. A. Sakharova, M. M. Vieira, J. V. Fernandes, M. F. Vieira, "Strain Path Change Effect on Deformation Behaviour of Materials with Low-to-Moderate Stacking Fault Energy", Materials Science Forum, Vols. 587-588, pp. 420-424, 2008
Online since
June 2008
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$32.00
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