Journal of Materials Science

, Volume 21, Issue 8, pp 2839–2842 | Cite as

Age hardening of rapidly quenched Al-Zr-B alloys

  • S. H. Whang
  • Y. Q. Gao
  • Y. -W. Kim


Ternary alloys from the Al-Zr-B system were prepared as thin foils by a rapid quench technique. These foils were annealed isothermally as well as isochronally at various temperatures (150 to 550° C). The microstructures show that at high temperature, the grain growth is significantly retarded by the grain boundary pinning of boride precipitates. A strong age hardening is also a characteristic phenomenon in these alloys. It is found that microstructure and microhardness largely depend upon the zirconium/boron ratio of the alloy, indicating that the ratio determines the types of compounds occurring in this alloy system. It appears that in these alloys, high concentration of boron and the low ratio of zirconium/boron together yield stable precipitates at high temperatures.


Polymer Microstructure Boron Boride Alloy System 
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Copyright information

© Chapman and Hall Ltd. 1986

Authors and Affiliations

  • S. H. Whang
    • 1
  • Y. Q. Gao
    • 1
  • Y. -W. Kim
    • 2
  1. 1.Barnett Institute of Chemical Analysis and Materials ScienceNortheastern UniversityBostonUSA
  2. 2.Metcut Materials Research GroupWright-Patterson Air Force BaseUSA

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