Microextrusion has recently emerged as a feasible manufacturing process to fabricate metallic micropins having characteristic dimensions on the order of less . At this length scale, the deformation of the workpiece is dominated by the so-called size effects, e.g., material property and frictional behavior variations at small length scales. In extrusion experiments performed to produce submillimeter-sized pins having a base diameter of and an extruded diameter of , the extruded pins exhibited a curving tendency when a workpiece with a relatively coarse grain size of was used. This phenomenon was not observed when workpieces with a finer grain size of were used. In this paper, results from microhardness tests and microstructure analyses for both grain sizes are presented to investigate this phenomenon and to characterize the deformation during microextrusion. The results obtained from this analysis show that as the grain size approaches the specimen feature size, the deformation characteristics of the extruded pins are dominated by the size and location of specific grains, leading to a nonuniform distribution of plastic strain and measured hardness and, thus, the curving tendency. Microhardness tests of the initial billet material and tensile test specimens are also presented as supplementary analyses.
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August 2007
Technical Papers
Investigation of Deformation Size Effects During Microextrusion
Sunal Ahmet Parasiz,
Sunal Ahmet Parasiz
Mechanical Engineering,
University of New Hampshire
, Kingsbury Hall, 33 College Rd., Durham, NH 03824
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Brad Kinsey,
Brad Kinsey
Mechanical Engineering,
University of New Hampshire
, Kingsbury Hall, 33 College Rd., Durham, NH 03824
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Neil Krishnan,
Neil Krishnan
Mechanical Engineering,
Northwestern University
, 2145 Sheridan Road, Evanston, IL 60208
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Jian Cao,
Jian Cao
Mechanical Engineering,
Northwestern University
, 2145 Sheridan Road, Evanston, IL 60208
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Ming Li
Ming Li
Alcoa Technical Center
, Alcoa Center, PA 15069
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Sunal Ahmet Parasiz
Mechanical Engineering,
University of New Hampshire
, Kingsbury Hall, 33 College Rd., Durham, NH 03824
Brad Kinsey
Mechanical Engineering,
University of New Hampshire
, Kingsbury Hall, 33 College Rd., Durham, NH 03824
Neil Krishnan
Mechanical Engineering,
Northwestern University
, 2145 Sheridan Road, Evanston, IL 60208
Jian Cao
Mechanical Engineering,
Northwestern University
, 2145 Sheridan Road, Evanston, IL 60208
Ming Li
Alcoa Technical Center
, Alcoa Center, PA 15069J. Manuf. Sci. Eng. Aug 2007, 129(4): 690-697 (8 pages)
Published Online: December 14, 2006
Article history
Received:
December 21, 2005
Revised:
December 14, 2006
Citation
Parasiz, S. A., Kinsey, B., Krishnan, N., Cao, J., and Li, M. (December 14, 2006). "Investigation of Deformation Size Effects During Microextrusion." ASME. J. Manuf. Sci. Eng. August 2007; 129(4): 690–697. https://doi.org/10.1115/1.2738107
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