Dynamics of Laves Phase Intersections in a Concentration Gradient-Reference-Cited by-同舟云学术

Dynamics of Laves Phase Intersections in a Concentration Gradient

Published:1984 Issue: Volume:39 Page:
ISSN:0272-9172
Container-title:MRS Proceedings
language:en
Short-container-title:MRS Proc.

Author:

Allen C. W.

Abstract

ABSTRACTIn the approximate interval 850–1150C, the Laves phase TiCr2 exhibits several composition dependent structures, ranging from two layer hexagonal (2H), denoted C14, to face-centered cubic, denoted C15, for Ti-deficient and Ti-excess material, respectively. Intermediate stacking variants such a dihexagonal (4H), denoted C36, may also exist. The Laves phase band in a Ti-Cr microdiffusion couple is examined in cross-section TEM at ambient temperature, after a 1000 C anneal. The band consists of very faulty hexagonal material, at least in part reflecting rapid shear transformation on cooling; in addition the cubic phase is present, in some instances within the same grain as the hexagonal phase. The cubic/hexagonal interfaces are approximately parallel rather than perpendicular to the bulk diffusion direction. Due to a difference in Ti and Cr fluxes, there is a gradual transformation of cubic to hexagonal by a shear mechanism. A model for the mobility of the hexagonal/cubic interface in a concentration gradient is proposed.

Publisher

Springer Science and Business Media LLC

Subject

General Engineering

Reference7 articles.

1. [6] Kolar H. , High Resolution Electron Microscopy of Phase Transformations in Laves Phase TiCr2, Masters Thesis, Arizona State University (1982).

2. [5] Allen C. W. and Liao K. C. , Proc. Int. Conf. on Martensitic Transformations (ICOMAT), 124–129 (1979).

3. [7] Allen C. W. and Liao K. C. , “On Crystallographic Shear in Ti-Cr Laves Phases.” In preparation for submission to Phys. Stat. Sol. (1985).

4. [4] Liao K. C. and Allen C. W. , Solid-Solid Phase Transformations, 1493–1497 (1982).

5. Dislocation Models for Shear Transformations

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