Formation of (B2+D0(3)) two-phase microstructure in a Fe-23 Al-7 Ti alloy

Abstract

As-quenched microstructure of the Fe-23 at% A1-7 at% Ti alloy was a mixture of (A2+D0(3)) phases. When the as-quenched alloy was aged at 1073 K for moderate times, D0(3) domains grew preferentially along (100) directions and extremely fine B2 particles occurred at a/2(100) antiphase boundaries (APBs). After prolonged aging at 1073 K, the 132 particles would grow to occupy the whole a/2(100) APBs. Consequently, the stable microstructure of the alloy at 1073 K was a mixture of (B2+D0(3)) phases.