Effect of Lamellar Spacing on Microstructural Instability and Creep Behavior of a Lamellar TiAl Alloy

摘要

Finer lamellar spacing in the lamellar structure of a Ti-45Al-2Nb-2Mn + 0.8 vol. percent TiB_2 (45XD) alloy does improve the primary creep resistance. However, the unstable nature of the fine plate contributes largely to the degradation of the lamellar structure and a rapid increase in the tertiary creep rate, indicating that a fine lamellar structure has a detrimental effect on the long-term creep.