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Journal of Materials Science

, Volume 10, Issue 12, pp 2075–2081 | Cite as

Precipitation in an Al-1.78 wt % Hf alloy after rapid solidification

  • Nils Ryum
Papers

Abstract

A metallographic study has been made of an Al-1.78 wt % Hf alloy after rapid solidification, and after high temperature annealing of the as-cast alloy. After solidification, Hf stays in supersaturated solid solution with a rather inhomogeneous distribution. On annealing, spheres and dendrites of an intermediate Al3Hf phase withLI2 structure, and perfectly coherent with the matrix, are formed. The spheres form by a continuous, the dendrite by a discontinuous precipitation reaction. After continued annealing theLI2 structure is replaced by a laminated structure ofLI2 andDO22, whereDO22 is the equilibrium structure of Al3Hf. The precipitation reactions in the systems Al-Hf and Al-Zr are compared.

Keywords

Polymer Precipitation Solid Solution Rapid Solidification High Temperature Annealing 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1975

Authors and Affiliations

  • Nils Ryum
    • 1
  1. 1.Institutt for Fysikalsk Metallurgi, N.T.H.TrondheimNorway

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