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Development of strain anisotropy during plastic deformation of an aluminum polycrystal

Lookup NU author(s): Dr Alexander Korsunsky, Karen Wells

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Abstract

To measure internal strains in an Al MMC, time-of-flight (TOF) ncutron diffraction was used on the ENGIN instrument at ISIS, RAL, in Oxfordshire, and a monochromated X-ray beam was employed on the BM16 beamline at the ESRF in Grenoble. The development of intergranular stresses between groups of grains possessing certain crystallographic orientations was studied using diffraction of penetrating radiation. Due to aluminum's highly isotropic elastic modulus, the variation of measured strains in the alloy matrix with orientation can be attributed to the anisotropy of the crystal yield surface and plastic flow parameters. A simple illustrative model is presented which explains the observed correlation between the amount of plastic strain (PS) and the measured anisotropy strain (AS) values. In particular, the model explains why a linear relationship is observed between AS and PS for low strain values, and how saturation of AS sets in at higher imposed PS levels.

Publication metadata

Author(s): Korsunsky AM, Daymond MR, Wells KE

Publication type: Article

Publication status: Published

Journal: Materials Science Forum

Year: 2000

Volume: 347-349

Pages: 492-497

Print publication date: 01/01/2000

ISSN (print): 0255-5476

ISSN (electronic):

Publisher: Trans Tech Publications

URL: http://dx.doi.org/10.4028/www.scientific.net/MSF.347-349.492

DOI: 10.4028/www.scientific.net/MSF.347-349.492

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