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Field-activated sintering of blended elemental γ-TiAl powder compacts: Porosity analysis and growth kinetics of Al3Ti

SCRIPTA MATERIALIA (2013)

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期刊

SCRIPTA MATERIALIA
卷 68, 期 11, 页码 841-844

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.02.004

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Spark plasma sintering; Titanium aluminide; Diffusion kinetics; Kirkendall porosity

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Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

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Various powder compacts with targeted compositions of TiAl and Ti(3)A1 were consolidated by field-activated sintering, specifically spark plasma sintering (SPS) at various temperatures, to examine phase growth under a superimposed electric field. While compacts with a composition of TiAl showed significant porosity after sintering, Ti(3)A1 compacts showed no porosity. The porosity is attributed principally to volume changes associated with the formation of Al3Ti and the Kirkendall effect. The kinetics underlying Al3Ti growth during SPS are also explained. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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