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Abstract
Thermoelectric power measurements (TEP) are used to study the microstructural evolution of β-quenched Zircaloy-4 samples during isothermal agings between 100 and 750°C. Five characteristic stages of evolution have been found and their existence confirmed by complementary observation techniques (microhardness, electrical resistivity, optical and electron microscopy). Segregation of solutes occurs at low temperature (stage 1). The main microstructural evolutions observed are precipitation (stage 2) and recrystallization of the basket-weave β-quenched structure (stage 3). A complete time-temperature transformation diagram between 20 and 750°C and for aging times up to 5 × 10 4 min has been drawn allowing a general view of the microstructural evolutions of Zircaloy-4 in that temperature and time domain.
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