Title

Prediction of strain gradient hardening during microextrusion

Abstract

A new formulation is presented to predict the strain distribution through the thickness of the workpiece during forward extrusion. By using shear components, a new model is established to estimate the geometrically necessary dislocation density, which is found to increase with a decrease in the initial and final specimen diameters and an increase in the die angle. Also, strain gradient hardening during forward microextrusion is predicted according to the calculated geometrically necessary dislocation (GND) density. It is found that to experience a significant amount of strain gradient hardening, the diameter of the material should be on the order of 400 mu m or less.

Publication Date

9-2-2010

Journal Title

Materials and Manufacturing Processes

Publisher

TAYLOR & FRANCIS INC

Digital Object Identifier (DOI)

10.1080/10426910903130024

Document Type

Article

Rights

Copyright © 2010, Taylor and Francis