Metallurgical Transactions A

, Volume 11, Issue 6, pp 993–999 | Cite as

Microanalysis of precipitate free zones (PFZ) in Al-Zn-Mg and Cu-Ni-Nb alloys

  • M. Raghavan


In order to better understand the formation of Precipitate Free Zones (PFZ), microanalysis was conducted on heat treated Al-2.2 at. pct Zn-4.7 at. pct Mg and Cu-30 at. pct Ni-0.9 at. pct Nb alloys. In both the alloys, no appreciable solute depletion at the grain boundaries was observed in the as-quenched condition. After aging, marked solute depletion was observed in the PFZ of both the alloys. In the Al-Zn-Mg alloy, the PFZ were supersaturated with respect toη andT phases up to 4 h of aging at 473 K. In the Cu-Ni-Nb alloy, the PFZ were supersaturated only with respect to theβ phase but not the metastable γ″ phase. Based on the results, the factors affecting the formation and growth of PFZ are discussed.


Metallurgical Transaction Stress Corrosion Crack Precipitate Free Zone Solute Profile Stress Corrosion Crack Susceptibility 
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Copyright information

© American Society for Metals and The Metallurgical Society of AIME 1980

Authors and Affiliations

  • M. Raghavan
    • 1
  1. 1.Corporate Research Science LaboratoriesExxon Research and Engineering CompanyLinden

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