Abstract
Phase transformation and microstructural change of an as-cast eutectoid Zn–Al alloy specimen Zn76Al22Cu2 (mass%) were investigated during tensile creep testing by using scanning electron microscopy (SEM) and X-ray diffraction techniques. Creep induced decomposition of a metastable η′T phase and a four-phase transformation, α+ε→T′+η, occurred during the creep testing. Also the detailed microstructural change from decomposed dendritic structure into spheroidized structure was observed in the neck zone and the rupture part of the specimen. The rupture was initiated within the spheroidized structure and developed along the grain boundaries of the fine lamellar structure and the decomposed η′T phase.
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