Electropulsing-induced phase transformations in a Zn–Al-based alloy

Yaohua Zhu, Sandy To, Wing B. Lee, Xingming Liu, Yanbin Jiang, Guoyi Tang
2009 Journal of Materials Research  
Microstructural changes and phase transformations of an electropulsing-treated (EPT) ZA22 alloy wire were studied using scanning electron microscopy and transmission electron-microscopy techniques. Two stages of phase transformation were detected in the EPT alloy: (i) quenching from the as-furnace cooled (FC) state to the final stable state and (ii) up-quenching from the final stable state back to the as-FC state through two reverse phase transformations: T 0 +Z ! a+e and Z 0 T +e+a ! Z 0 FC .
more » ... lectropulsing accelerated phase transformation tremendously. It was at least 1200 times faster than the aging process. The mechanism of the electropulsing-induced phase transformations is discussed from the point of view of Gibbs free energy and electropulsing kinetics.
doi:10.1557/jmr.2009.0300 fatcat:occ22iczwvhtdekry7mmh4trzm