Solidification of Highly Undercooled Liquid Metals and Alloys.

Abstract

The undercooling and solidification of liquid alloys in fine droplet form has been examined by thermal analysis, X-ray diffraction and metallography. New maximum undercooling limits have been established for several metals and hypercooling has been demonstrated for the first time in a metallic system. In alloys some aspects of the phase selection kinetics for formation of metastable phases have been identified in eutectic, peritectic and monotectic reactions. The use of droplet samples allows the measurement of thermodynamic properties of undercooled liquids and the study of microstructure development with changing undercooling. In some alloys, the effective isolation of nucleants that is possible with micron size droplets results in a continuous solidification to the amorphous state. The observations are presented in terms of the potential of undercooling for structure modification and rapid solidification technology. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 17, 1980
Accession Number
ADA080791

Entities

People

  • John H. Perepezko

Organizations

  • University of Wisconsin–Madison

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Diffraction
  • Heat Energy
  • Heat Transfer
  • Latent Heat
  • Liquid Metals
  • Liquid Phases
  • Materials
  • Measurement
  • Melting Point
  • Military Research
  • Phase
  • Specific Heat
  • Thermal Analysis
  • Thermodynamic Properties
  • Thermodynamics
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.