Quantitative measurements of small scaled grain sliding in ultra-fine grained Al-Zn alloys produced by friction stir processing

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2010.06.017· OSTI ID:22066229

Hu, C.M., E-mail: [e-mail]; Lai, C.M., E-mail: [e-mail]; Kao, P.W., E-mail: [e-mail]; Ho, N.J., E-mail: [e-mail]; Huang, J.C., E-mail: [e-mail]

An Al-15 wt.% Zn alloy was processed by friction stir processing to produce grain sizes of {approx} 0.5 {mu}m, {approx} 1 {mu}m, and {approx} 2 {mu}m. A simple and effective method was developed to determine the true strain by scribing marker lines with scaled division using focused ion beam micromachining prior to deformation. The 'microscopic' grain boundary sliding, with displacements of adjacent grains of the order of a nanometer, can easily be detected by the proposed technique, providing a surface analysis with high accuracy that could be used to observe the changes in relief with increasing strains. Moreover, the occurrence of grain boundary sliding at room temperature was considered a major cause for higher strain rate sensitivity in fine-grained Al-Zn alloys.

• OSTI ID: 22066229
• Journal Information: Materials Characterization, Vol. 61, Issue 11; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DEFORMATION
FRICTION
GRAIN BOUNDARIES
GRAIN SIZE
ION BEAMS
PROCESSING
STRAIN RATE
STRAINS
SURFACES
TEMPERATURE RANGE 0273-0400 K
ZINC ALLOYS