Quantitative analysis of the effect of heat treatment on microstructural evolution and microhardness of an isothermally forged Ti-22Al-25Nb (at.%) orthorhombic alloy

(a) Microstructures of the alloy solution-treated at 920 °C, (b) The microstructure of the alloy when solution-treated at 940 °C and then aged at the 760 °C.