Effect of specimen size and grain size on deformation in microextrusion

Sunal Ahmet Parasz, Brad L. Kinsey*, Numpon Mahayatsanun, Jian Cao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Miniaturization of systems and devices continues unabated, which in turn requires the production of microscale components. Similar to the macroscale process, microextrusion provides a means to fabricate metallic micropins having characteristic dimensions on the order of 1 mm or less with a lower-cost, high-throughput process. In this paper, the effect of the specimen size and grain size on deformation during microextrusion is investigated. Microhardness, microstructure, and X-ray texture analyses show that when the grain size becomes comparable to the specimen feature size, together with miniaturization, penetration of the shear deformation occurs. As a result, the coarse-grained structure has higher hardness than the fine-grained structure, especially in the central regions of the cross-section for the two smallest size extrusion cases investigated, which have Ø0.76/0.57 mm and Ø1.5/1.0 mm dimensions before and after extrusion, respectively. For the largest size extrusion case investigated, Ø2.0/1.33 mm pins, the coarse-grained structure has a lower hardness than the fine-grained one, which is typical for macroscale processes and consistent with the HallPetch relationship.

Original languageEnglish (US)
Pages (from-to)153-159
Number of pages7
JournalJournal of Manufacturing Processes
Issue number2
StatePublished - Aug 2011

ASJC Scopus subject areas

  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering


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