Document Type

Article

Publication Date

12-28-2009

Journal or Book Title

Journal of Manufacturing Science and Engineering

Volume

132

Issue

1

First Page

011003

DOI

10.1115/1.4000636

Abstract

Semisolid powder forming is a promising approach for near-net shape forming of features in macro-/microscale. In this paper, viscosity and phase segregation behavior of Al–Si powders in the semisolid state were studied with back extrusion experiments. The effects of process parameters including shear rate, extrusion ratio, heating time, and precompaction pressure were analyzed using the design of experiments method. The results showed that the effects of shear rate, extrusion, ratio and heating time were statistically significant factors influencing the viscosity. The semisolid state powders showed a shear thinning behavior. Moreover, microstructure analysis of extruded parts indicated severe phase segregation during the forming process. As the extrusion opening became small (∼400 μm), the phase segregation increased. This study expanded the semisolid processing technology by exploring the use of powdered materials instead of typical bulk materials for applications in micro-/mesomanufacturing. Replacing bulk materials with powdered materials may add a new dimension to the technique by allowing tailoring of material properties.

Comments

This article is from Journal of Manufacturing Science and Engineering 132 (2009): 011003, doi:10.1115/1.4000636. Posted with permission.

Copyright Owner

ASME

Language

en

File Format

application/pdf

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