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Equal channel angular pressing of metal matrix composites: effect on particle distribution and fracture toughness

journal contribution
posted on 2005-10-01, 00:00 authored by Ilchat Sabirov, O Kolednik, R Valiev, R Pippan
An Al6061-20%Al2O3 powder metallurgy (PM) metal matrix composite (MMC) with a strongly clustered particle distribution is subjected to equal channel angular pressing (ECAP) at a temperature of 370 °C. The evolution of the homogeneity of the particle distribution in the material during ECAP is investigated by the quadrat method. The model proposed by Tan and Zhang [Mater Sci Eng 1998;244:80] for estimating the critical particle size which is required for a homogeneous particle distribution in PM MMCs is extended to the case of a combination of extrusion and ECAP. The applicability of the model to predict a homogeneity of the particle distribution after extrusion and ECAP is discussed. It is shown that ECAP leads to an increase of the  uniformity of the particle distribution and the fracture toughness.

History

Journal

Acta materialia

Volume

53

Issue

18

Pagination

4919 - 4930

Publisher

Elsevier Science

Location

Tarrytown, N.Y.

ISSN

1359-6454

eISSN

1873-2453

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2005, Acta Materialia Inc.