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In this work, an Nb-14Si-24Ti alloy (at.%) was prepared by liquid-metal-cooled directional solidification (DS) and then heat treated (HT) at 1450°C for 100 h. The effects of the withdrawal rate and heat treatment on the microstructure were investigated. The results show that the DS samples consisted of Nb SS  dendrites, Nb 3 Si blocks and eutectic Nb SS /Nb 3 Si. As the withdrawal rate increased, the microstructure became finer, the volume fraction of eutectic Nb SS /Nb 3 Si increased and the morphology of eutectic cell transformed from petaloid to regularly arranged granular morphology. The microstructure of the HT samples consisted of Nb SS  and Nb 3 Si. The metastable phase of Nb 3 Si did not discompose through the eutectoid reaction. The dendritic Nb SS connected through diffraction and the secondary dendrite arm got coarser. The boundary of eutectic Nb SS /Nb 3 Si became blurry and the black Ti-rich phase of the DS samples in this region disappeared. The Nb 3 Si connected to form the continuous matrix. The granular Nb SS  of eutectics spheroidized and the lamellar Nb SS  of eutectic interconnected and became more bending distributed uniformly in the Nb 3 Si matrix.

The Effects of the Withdrawal Rate and Heat Treatment on the Microstructure of Directionally Solidified Nb-14Si-24Ti Alloy