Rapid Solidification Processing and Powder Metallurgy of Al Alloys.

Abstract

During the second year of the program, there have been five areas of emphasis. These are: 1) the development of a model to describe the mechanism of formation of rapidly solidified Al alloys (i.e. zones A and B); ii) the processing of particulate whose microstructure consists entirely of zone A; iii) the microstructures of rapidly solidified particulate of alloys based on Ai-8Fe; iv) the identification of metastable phases which form in some of the Al alloys studied; and v) dynamic compaction of particulate. A simple model for the formation of rapidly solidified hyper-eutectic Al alloys has been developed. This model is based on the degree of undercooling achieved prior to nucleation and the extent to which recalescence effects may be inhibited by a rapid rate of heat-extraction. Zone A microstructures form when the temperature is lowered to below that of the extended alpha-Al liquidus where primary Al may be nucleated. The microstructures of rapidly solidified Al-Ni and Al-Co alloys may be interpreted satisfactorily by this model.

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Document Details

Document Type
Technical Report
Publication Date
Oct 29, 1984
Accession Number
ADA148427

Entities

People

  • H.L. Fraser

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Cellular Structures
  • Crystal Structure
  • Diffraction
  • Electron Microscopy
  • Energy
  • Fiber Spinning
  • Heat Energy
  • Heat Of Fusion
  • Heat Treatment
  • Latent Heat
  • Materials
  • Particles
  • Phase Diagrams
  • Phase Transformations
  • Solid Solutions
  • Thermal Stability
  • Transmission Electron Microscopy

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.