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Research Papers

Surface Roughening During Deformation of Polycrystalline Aluminum and Titanium Alloys

[+] Author and Article Information
X. H. Zhou1

Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, P.R. Chinayefengzh@163.com

X. Su

Faculty of Science, NingBo University, NingBo 315211, P.R. Chinamrs.an.1988@hotmail.com

1

Corresponding author.

J. Eng. Mater. Technol 132(4), 041001 (Sep 08, 2010) (6 pages) doi:10.1115/1.4002107 History: Received November 04, 2009; Revised July 01, 2010; Published September 08, 2010; Online September 08, 2010

The surface topography of aluminum and titanium alloys after plastic deformation is investigated using white-light interferometry. The surface profiles of tensile samples in the longitudinal and transverse directions are analyzed. The surface develops self-affine roughness on length scales up to a correlation length that is of the same order of magnitude as the grain size in the two directions. The difference in correlation lengths between the two directions is large for aluminum alloy and small for titanium alloy. Initially, the roughness values in the two directions remain the same and then become different with strain increase. It is shown that the strains in the two directions influence the profile. The relationship between the 3D surface roughness parameter (Sq) and strain appears to be linear, and a linear relation is also observed between surface area increment and strain.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Roughness plots obtained from the as-polished titanium surface and after deformation to stains of 5%: (a) surface profile and (b) double-logarithmic mean height difference versus distance along profile

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Figure 2

Roughness plots: (a) aluminum in longitudinal direction, (b) aluminum in transverse direction, (c) titanium in longitudinal direction, and (d) titanium in transverse direction

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Figure 3

Hurst exponents and fractal dimension as a function of strain: (a) aluminum and (b) titanium

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Figure 4

The correlation length ξ of aluminum and titanium under different strain values

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Figure 5

2D roughness Rq of aluminum and titanium under different strains

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Figure 6

3D roughness Sq and surface area increment ΔS versus strain

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Figure 7

Multiscaling analysis of surface profile taken at ε=5% during tensile deformation for titanium sample; the dotted line indicates the limits of the scaling regimes used in fitting the scaling exponents Hn

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