Abstract
In this investigation, Nb–16Si–24Ti–4Cr–2Al–2Hf alloy was directionally solidified and then heat treated, and the microstructure, fracture toughness KQ and tensile strength σb of the alloy were studied. The directionally solidified microstructure consisted of primary Nb5Si3 blocks and NbSS+Nb5Si3 eutectic cells. The cross section of eutectic cells changed from the square morphology to the nearly round morphology with the increasing withdrawal rate. During heat treatment, the boundaries of the round eutectic cells were eliminated as the NbSS connected to be a net-like structure. The values of KQ and σb increased with the increase of withdrawal rate. The toughening from the crack deflection of continuous Nbss network was significant and refinement of the microstructure improved the tensile strength in heat treated samples.
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