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Effects of processing parameters on relative density, microhardness and microstructure of recycled Ti-6Al-4V from machining chips produced by equal channel angular pressing

journal contribution
posted on 11.12.2015 by Alex Shi, Yau Tse, Rebecca Higginson
Ti-6Al-4V was recycled from machining chips by using equal channel angular pressing (ECAP). Samples were pressed through a die up to 8 passes at moderate temperatures in the range of 400-500 °C. The ECAP process was accomplished with back-pressures ranging from 50 to 250. MPa. The results demonstrate that ECAP with back-pressures allows the consolidation of machining chips to near fully dense (~99.9%) recycled products. The relative density of the as-recycled samples increased with the applied back-pressure and number of passes. The average hardness and homogeneity were improved as the number of passes increased. The transmission electron microscopy reveals a combination of equiaxed and elongated α grains after the first pass. With subsequent pressing, the samples were dominated by nano-equiaxed α grains with diameters of ~70 nm. The original β phase in the machining chips was fragmented during the ECAP process.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Materials Science and Engineering A

Volume

651

Pages

248 - 258

Citation

SHI, Q., TSE, Y.Y. and HIGGINSON, R.L., 2016. Effects of processing parameters on relative density, microhardness and microstructure of recycled Ti-6Al-4V from machining chips produced by equal channel angular pressing. Materials Science and Engineering A, 651, pp. 248 - 258

Publisher

© Elsevier

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

01/11/2015

Publication date

2015-11-03

Copyright date

2016

Notes

This article is closed access.

ISSN

0921-5093

Language

en

Exports