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Evolution of nanoscale porosity during equal-channel angular pressing of titanium

journal contribution
posted on 2009-06-01, 00:00 authored by Rimma Lapovok, D Tomus, J Mang, Y Estrin, T C Lowe
Small-angle neutron scattering (SANS) analysis and transmission electron microscopy evidence suggest the occurrence of nanoscale porosity in commercial-purity titanium processed by equal-channel angular pressing (ECAP). SANS data were produced at two different facilities (GKSS, Germany; and Los Alamos, USA) and were analysed using three different methods. The results are consistent and yield a conclusive picture of the distribution of the scattering centres, which are believed to be associated with nanoporosity. Back pressure applied during ECAP tends to reduce the average pore size, which also depends on the processing route used. The results of the study strongly suggest that ECAP leaves a footprint in titanium in the form of a population of polydispersed nanovoids, which may play an important role in subsequent processing of the material.

History

Journal

Acta materialia

Volume

57

Issue

10

Pagination

2909 - 2918

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

1359-6454

Language

eng

Publication classification

C Journal article; C1.1 Refereed article in a scholarly journal

Copyright notice

2009, Acta Materialia