Paper Title:
Study of Refined Microstructures after Two-Step Heat Treatments by Means of EBSD Technique on γ-TiAl Alloys
  Abstract

In this work, significant modification of the microstructure of a rolled Ti-45Al-5Nb (at.%) alloy has been achieved by a two-step heat treatment. A combination of high cooling rates for the first step of the treatments with a subsequent annealing at high temperatures, results in refined microstructures where substantial discontinuous coarsening seems to play an important role for the grain refinement. In order to fully understand the transformation mechanisms responsible for such a refinement, Electron Back Scattered Diffraction (EBSD) technique has been extensively used. In particular, a study of orientation relationships between the phases which are present in the transformed microstructures, was performed by this technique. Besides discontinuous coarsening process, the obtained results also suggest that a modified discontinuous coarsening mechanism is operative, in order to justify the formation of novel microstructures, whose development could not be explained by the classical discontinuous coarsening.

  Info
Periodical
Materials Science Forum (Volumes 638-642)
Main Theme
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
1416-1421
DOI
10.4028/www.scientific.net/MSF.638-642.1416
Citation
M. Pérez-Bravo, T. Baudin, D. Boivin, M. Thomas, I. Madariaga, K. Ostolaza, M. Tello, "Study of Refined Microstructures after Two-Step Heat Treatments by Means of EBSD Technique on γ-TiAl Alloys", Materials Science Forum, Vols. 638-642, pp. 1416-1421, 2010
Online since
January 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Q. Xing, X. Huang, Niels Hansen
Abstract:The microstructural evolution during annealing below the recrystallization temperature of a commercial purity aluminum (99wt.% purity) cold...
209
Authors: Michael Ferry
Abstract:The uniformity of grain coarsening throughout the microstructure of a submicron grained particle-containing aluminium alloy has been...
251
Authors: X. Huang, Q. Xing, Dorte Juul Jensen, Niels Hansen
Abstract:TEM, Kikuchi diffraction analyses, EBSD, neutron diffraction and hardness measurements have been applied in a study of commercial purity...
79
Authors: Dong Yi Seo, S. Bulmer, H. Saari, Peter Au
Abstract:The microstructures and mechanical properties of three powder metallurgy Ti-48Al-2Cr- 2Nb-xW alloys (where x=0, 0.5, and 1 atomic percent...
481
Authors: Y. Huang, G.H. Zahid, Philip B. Prangnell
Tuesday
Abstract:The grain structure and texture evolution during annealing an Al-0.13%Mg submicron grained alloy, deformed by plane strain compression (PSC)...
219