SOLIDIFICATION OF MONOTECTIC ALLOYS - MICROSTRUCTURES AND PHASE SPACINGS.

Document Type

Conference Proceeding

Publication Date

6-1984

Department

Department of Materials Science and Engineering

Abstract

The microstructures of directionally grown monotectic alloys in metallic and organic systems fall into two categories - those which can form aligned fibrous composite structures with even phase spacings and fiber sections, and those in which the phase distribution is coarser and less regular. This division relates to the form of the phase diagram and has been rationalized by J. W. Cahn in terms of the relative surface energies between solid and two liquids to give steady state or nonsteady state profiles. The transition in growth behavior occurs when the ratio of the monotectic temperature, T//m, to that of the upper consolute temperature, T//c, is approximately 0. 9. Differences in phase spacings between a range of monotectic and eutectic systems are discussed in terms of the expected growth interface shapes and the factors which will influence them.

Publication Title

Metallurgical transactions. A, Physical metallurgy and materials science

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