Surface oxide debonding in field assisted powder sintering

Field activated sintering techniques (FAST) have been applied to two high-temperature powder materials: tungsten and NiAl. High and atomic resolution electron microscopy (HREM/ARM) of tungsten powder sintered via FAST showed essentially clean boundaries. Analytical transmission electron microscopy (...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1999-09, Vol.270 (2), p.278-282
Hauptverfasser:	Anderson, K.R, Groza, J.R, Fendorf, M, Echer, C.J
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Clean grain boundaries Cross-disciplinary physics: materials science rheology Exact sciences and technology Field activation HREM Materials science Materials synthesis materials processing Metals. Metallurgy Phase diagrams and microstructures developed by solidification and solid-solid phase transformations Physics Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation Precipitation Sintering Solid-phase precipitation
Online-Zugang:	Volltext
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	Field activated sintering techniques (FAST) have been applied to two high-temperature powder materials: tungsten and NiAl. High and atomic resolution electron microscopy (HREM/ARM) of tungsten powder sintered via FAST showed essentially clean boundaries. Analytical transmission electron microscopy (TEM) of FAST sintered NiAl also showed boundaries free of surface oxide layer(s). However, small alumina precipitates were found at and near prior particle (grain) boundaries. The boundary cleaning and precipitation phenomena are manifestations of an applied pulsed electric field.
ISSN:	0921-5093 1873-4936
DOI:	10.1016/S0921-5093(99)00197-5