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The Annealing Induced Solid State Transformation of Quenched Beta Cr-Ti

Published online by Cambridge University Press:  26 February 2011

W. Sinkler  and
D. E. Luzzi
W. Sinkler
Affiliation:
Department of Materials Science and the Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104–6272
D. E. Luzzi
Affiliation:
Department of Materials Science and the Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, PA 19104–6272
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Abstract

Microstructural changes in the bcc-based water-quenched alloy β Cr40Ti60 have been investigated as a function of annealing time at 873 K. The as-quenched structure has been found to contain a non-ideal form of the ω structure, which has been detected and characterized on the basis of diffuse scattering to which it gives rise in electron diffraction patterns. Annealing at 873 K results initially in platelet precipitates of the metastable β″ phase, which is found to posses a bulk body centered tetragonal structure in which chemical ordering has been detected via electron diffraction and high resolution microscopy. After several hours of annealing at 873 K the equilibrium phases α-Ti and the C15 Laves phase Cr2Ti form as spherical polycrystalline aggregates. No evidence is found of reported annealing-induced amorphization [1]. It is suggested that amorphization cannot occur in this alloy via thermal activation, and that the reported findings may have resulted from impure specimens.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 209
Copyright
Copyright © Materials Research Society 1992

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