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Texture Formation of α2-Ti3Al during Hot Forming of γ-TiAl Based Alloys

Published online by Cambridge University Press:  18 January 2011

Andreas Stark ,
Daniel Gosslar  and
Nikolai Pashkov
Andreas Stark
Affiliation:
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany
Daniel Gosslar
Affiliation:
Institute of Materials Science and Technology, Hamburg University of Technology, Eißendorfer Str. 42, D-21073 Hamburg, Germany
Nikolai Pashkov
Affiliation:
Institute of Materials Science and Technology, Hamburg University of Technology, Eißendorfer Str. 42, D-21073 Hamburg, Germany
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Abstract

In the present study the α2 and the γ texture in a Ti-45Al (at.%) alloy were analyzed by means of x-ray diffraction after hot deformation. The initial Ti-45Al powder compact exhibits a random texture and shows a relatively high amount of α2 phase (about 34 vol.%). Various hot compression tests were performed at temperatures ranging from 700 °C to 1100 °C with strain rates of 5·10–4 s–1 and 5·10–2 s–1 up to a true deformation of ε = –1.

Depending on the deformation temperature the γ-TiAl deformation texture consists of pure deformation components (700 °C) or components completely related to dynamic recrystallization (1100 °C). In contrast to the γ phase the α2 phase shows no remarkable changing of the deformation texture with increasing temperature. The α2 deformation texture basically consists of a similar component as it is known from hexagonal α-Ti, namely a tilted basal fiber. However, a significant influence of the deformation rate on the α2 texture formation is observed at temperatures above 800 °C. With increasing deformation temperature the α2 texture strengthens by applying a high deformation rate, whereas it weakens for a low deformation rate. This contrary behavior is attributed to the interaction of the α2 and γ phases during texture formation.

Keywords

texturex-ray diffraction (XRD)forging
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n05-15
Copyright
Copyright © Materials Research Society 2011

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