Structural changes of α phase in furnace cooled eutectoid Zn-Al based alloy

Y. H. Zhu, Kang Cheung Chan, G. K.H. Pang, Tai Man Yue, Wing Bun Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

Furnace cooling is a slow cooling process. It is of importance to study structural evolution and its effects on the properties of alloys during the furnace cooling. Decomposition of aluminium rich α phase in a furnace cooled eutectoid Zn-Al based alloy was studied by transmission electron microscopy. Two kinds of precipitates in the α phase were detected in the FCZA22 alloy during ageing at 170°C. One was the hcp transitional α′mphase which appears as directional rods and the round precipitates. The other was the fcc α′mphase. It was found that the transitional phase α′mgrew in three preferential directions of <110>, <011> and <101>. The orientation relationship between the α phase and transitional phase α′m was determined as,. The non-equilibrium phase decomposition of the α phase is discussed in correlation with the equilibrium phase relationships. (022̄)α′m(fcc)//(022̄)α(fcc), [1̄11]α′m(fcc)//[2̄33]α(fcc). The non-equilibrium phase decomposition of the phase is discussed in correlation with the equilibrium phase relationships.
Original languageEnglish
Pages (from-to)347-352
Number of pages6
JournalJournal of Materials Science and Technology
Volume23
Issue number3
Publication statusPublished - 1 May 2007

Keywords

  • Microstructural evolution
  • Phase decomposition
  • Zn-Al alloys

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Polymers and Plastics
  • Metals and Alloys
  • Materials Chemistry

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