Discontinuous precipitation initiated at interphase boundaries in a Zn-rich Zn-6.3 at.% Ag alloy

Abstract

Discontinuous precipitation in a two-phase Zn-rich Zn± 6.3 at.% Ag alloy has been studied. It has been shown that the Z 0 =e interphase boundaries have the ability to initiate discontinuous precipitation as do the Z 0 =Z 0 grain boundaries. The back-polishing method is used to show the interconnection between a discontinuous precipitate colony and the Z 0 =e interphase boundary. The reaction front velocity of discontinuous precipitation initiated at the Z 0 =Z 0 grain boundary is 12± 90% higher than that of discontinuous precipitation initiated at the Z 0 =e interphase boundary under various ageing temperatures.