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


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.


Polymer Precipitation Solid Solution Rapid Solidification High Temperature Annealing 
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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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