Exothermic reaction in eutectoid Zn-Al based alloys

Y. H. Zhu, Hau Chung Man, Wing Bun Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)


Both solution treated and quench-aged eutectoid Zn-Al based alloys (ZnAl20Cu3Si2 and ZnAl22Cu2 in wt.%) were studied by differential scanning calorimeter (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. An exothermic phenomenon was observed at the early stage of ageing. Similar behavior was also found for the cast eutectoid Zn-Al alloy. The activation energy for the exothermic phenomenon was calculated, which was in a good agreement with that derived from X-ray diffraction examination for the decomposition of the supersaturated β′sphase in the eutectoid Zn-Al based alloy. It is concluded that the decomposition of the β′sphase is an exothermic solid state reaction in the eutectoid Zn-Al based alloys.
Original languageEnglish
Pages (from-to)147-153
Number of pages7
JournalMaterials Science and Engineering A
Issue number1-2
Publication statusPublished - 15 Aug 1999


  • Exothermic reaction
  • Scanning electron microscopy
  • Zn-Al alloys

ASJC Scopus subject areas

  • General Materials Science


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