Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18168
Title: Study of size effect in micro-extrusion process of pure copper
Authors: Chan, WL
Fu, MW 
Yang, B
Keywords: A. Non-ferrous metals and alloys
C. Forming
G. Metallography
Issue Date: 2011
Publisher: Elsevier
Source: Materials and design, 2011, v. 32, no. 7, p. 3772-3782 How to cite?
Journal: Materials and design 
Abstract: The size effect on material deformation behaviors are characterized by grain size, part feature size, forming material size and interfacial condition. These factors have a close relationship with material flow behavior, which in turn affects the geometry accuracy of micro-formed parts. In this study, a general-purpose tooling set for realization of micro-forward, backward, combined forward rod-backward can and double cup extrusions is developed and the micro-extrusions of pure copper with different grain sizes are conducted. The size effect phenomena are analyzed based on the deformation load, interfacial friction behavior and microstructure evolution. It is found that the interfacial friction is high in micro-extrusion processes and the grain size effect on deformation load is sensitive to the friction force at the tooling-workpiece interface. The microstructures of the extruded parts show the occurrence of inhomogenous deformation and a large number of slip bands passing through the grain boundaries to accomplish the strain continuity in the cases with coarse grains. In addition, the flow stress curves obtained from micro-compression are used to model the micro-extrusion processes using finite element (FE) simulation based on the conventional material model. It is found that the conventional material model is not applicable in simulation of the material deformation behavior and evaluation of the interfacial friction in micro-extrusion processes due to the size effect. This research therefore provides an in-depth understanding of size effect in micro-extrusion processes, which is critical to further formulate design rules to facilitate the development of micro-parts.
URI: http://hdl.handle.net/10397/18168
ISSN: 0264-1275
EISSN: 1873-4197
DOI: 10.1016/j.matdes.2011.03.045
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