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Grain Orientation Effect During Single Asperity Plowing of Two-Dimensionally Polycrystalline Aluminum Alloys

Published online by Cambridge University Press:  10 February 2011

L. G. Hector Jr. ,
S. M. Opalka ,
H. Weiland  and
S. R. Schmid
L. G. Hector Jr.
Affiliation:
Surface Science Center. Alcoa Technical Center, Alcoa Center, PA 15069
S. M. Opalka
Affiliation:
Surface Science Center. Alcoa Technical Center, Alcoa Center, PA 15069
H. Weiland
Affiliation:
Surface Science Center. Alcoa Technical Center, Alcoa Center, PA 15069
S. R. Schmid
Affiliation:
AME Department. University of Notre Dame, Notre Dame. IN 46556 University of Notre Dame
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Abstract

Results are presented from a series of atomic force microscope (AFM) experiments, wherein a sharp diamond indentor with a sub-micron tip radius. was directed to plow along specific crystallographic directions on selected alloy aluminum surfaces. A set of four. two-dimensionally polycrystalline aluminum alloys was chosen for this work. viz.. Al-99.99wt%. Al-0.2wt%Mg. Al-l.Owt%Mn. and Al-0.5wt%Cu. Crystallographic orientations of the surface grains upon which plowing was conducted were determined a priori through orientation imaging microscopy (OIM). Two sets of plow tracks were generated in four crystallographic directions. each set containing four plow tracks generated at four different normal indentor forces. The plow tracks were subsequently imaged to provide measurements of the plow track depths. ridge heights, and ridge angles relative to the nominal (undisturbed) surface plane. This data was then input to a model of single asperity plowing based on the upper bound theorem of plasticity for isotropic. non-strain hardening materials. The model provided estimates of surface flow strength as a function of depth of cut for each of the crystallographic directions. Experimental measurements of the friction (or plowing) force and depth of cut variations with normal indentor force are also presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 399
Copyright
Copyright © Materials Research Society 1998

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References

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