In situ transformation from P phase to μ phase in rhenium-containing single-crystal superalloy during thermal exposure

Abstract

<p>An <i>in situ</i> phase transformation from P to μ in a rhenium-containing superalloy during high-temperature exposure has been investigated by transmission electron microscopy. The orientation relationship between the phases is found as (1–12)_μ // (1 0 0)_P and [2 4 1]_μ // [0 1 1]_P. An atomic model of the μ/P interface was built to reveal a perfectly coherent interface with lattice misfits of only 0.421 and 1.098%. Considering the small lattice distortions and the similar elemental composition of the phases, it is concluded that the phase transformation from P to μ is favourable.</p