Abstract
Nb-xSi(x=3,9)-22Ti-3Cr-3Al-2Hf (at.%) have been successfully prepared by directional solidification(DS) in an optical floating zone furnace with different rotation mode. Microstructure analysis and phases identification of the alloys were examined by X-ray diffraction (XRD), Electro Probe Micro Analyzer (EPMA) and Energy Disperse Spectroscopy (EDS). Fracture toughness specimens without pre-crack were prepared and room temperature fracture toughness of alloys was tested by three-point bending method. The results showed the microstructure and fracture toughness of directionally solidified Nb-silicon based alloys were seriously affected by the rotation mode in the processing of directional solidification. The influence of rotate mode on microstructure and fracture toughness had been discussed in this paper.
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