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Grain refinement and texture formation in torsion deformed NiAl

Kornfeinen und Texturbildung in torsionsverformtem Nickelaluminid
 
: Klöden, B.; Rybacki, E.; Oertel, C.G.; Skrotzki, W.

International journal of materials research 98 (2007), No.4, pp.276-282
ISSN: 1862-5282
Conference "Ultrafine Grained Materials - From Basics to Applications" (UFG) <2006, Irsee>
English
Conference Paper, Journal Article
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()
Nickelaluminiumlegierung; Intermetallische Verbindung; Torsionsbeanspruchung; Verformung; dynamische Rekristallisation; Scherbeanspruchung; Spannungs-Dehnungs-Verhalten; Temperatureinfluß; Würfellage; Goss-Textur; Streckbarkeit; Kornfeinung; Mikrostruktur

Abstract
During high-strain torsion of NiAl at elevated temperatures continuous dynamic recrystallisation leads to grain refinement into the micron range. The steady state fraction of high angle grain boundaries is between 60 % to 80 %. At the lowest temperature used the 'grain size' is only a factor of 1.2 larger than the subgrain size. The shear texture is characterised by two components, {100}<100> (cube) and {110}<100> (Goss) increasing with strain to an almost constant strength. The intensity of Goss increases with temperature, while that of the cube decreases independent of the initial orientation. Ductilisation of NiAl seems to be an inherent problem due to a high plastic anisotropy. However, as discussed, under certain conditions grain refinement may help to ductilise the material. This has to be proven by further experiments.

: http://publica.fraunhofer.de/documents/N-60649.html