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Title: Effects of processing parameters on relative density, microhardness and microstructure of recycled Ti-6Al-4V from machining chips produced by equal channel angular pressing
Authors: Shi, Qi (Alex)
Tse, Yau Yau
Higginson, Rebecca L.
Keywords: Ti–6Al–4V
Machining chip
Recycling
Equal channel angular pressing
Microstructural characterization
Microhardness measurement
Issue Date: 2016
Publisher: © Elsevier
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
Abstract: 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.
Description: This article is closed access.
Version: Published
DOI: 10.1016/j.msea.2015.11.002
URI: https://dspace.lboro.ac.uk/2134/19833
Publisher Link: http://dx.doi.org/10.1016/j.msea.2015.11.002
ISSN: 0921-5093
Appears in Collections:Closed Access (Materials)

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