Abstract
The decomposition of the supersaturated solid solution of ZA27 alloy at room temperature has been investigated by X-ray diffraction, TEM and mechanical properties testing. Based on the results obtained, both continuous precipitation and cellular reaction occur during the decomposition process. The continuous precipitation follows the sequence: α′ → α1′ + spherical GP zones → α2′ + elliptical GP zones → α3′ + R → α + η. The cellular reaction can be written: α → α + η + e. The properties of the alloy depend on the microstructure. After 1 month of ageing, a series of changes of microstructure have taken place. The properties of the alloy are: σb=500 MPa, δ=13%,Hv=148.
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