Journal
SCRIPTA MATERIALIA
Volume 69, Issue 2, Pages 107-111Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.02.020
Keywords
Defect segregation; Enhanced electronic and ionic conduction; Selective joule heating; Flash sintering; Field assisted phenomena
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A unified mechanism for field-assisted phenomena such as enhanced rapid flash sintering, reduction in flow stress and grain growth retardation is proposed. It is argued that defect segregation causes enhanced ionic and electronic transport along dislocations and grain boundaries, which leads to enhanced mobility of dislocations and their selective Joule heating. This selective heating, if uncontrolled, can lead to an avalanche and selective melting of grain boundaries, which is proposed to be the primary mechanism for flash sintering of oxides. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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