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In this work, pure Nb, Nb 5 Si 3 and Laves Cr 2 Nb compound powders were used as raw materials to prepare Nb-Si-Cr ternary alloys by spark plasma sintering (SPS). A comprehensive estimation of the microstructure and properties, including room temperature fracture toughness, high temperature strength and oxidation resistance, of the Nb-Si-Cr ternary alloys as a function of the Nb/Nb 5 Si 3 /Cr 2 Nb phase volume fraction combinations was conducted. The results showed that Nb-Si-Cr ternary samples with the relative density larger than 98.42% were obtained by SPS processing, and the samples all consisted of Nb, Nb 5 Si 3 and Cr 2 Nb phases that were distributed homogeneously. The fracture toughness K Q of the Nb/Nb 5 Si 3 /Cr 2 Nb microstructure, which was dominated by the Nb phase, naturally increased with the Nb fraction. As expected, the room-temperature Vickers hardness and the high-temperature strength of the bulk alloys increased monotonically with the increasing of the stiffening Nb 5 Si 3 fraction. Interestingly, the binary Cr 2 Nb phase played a positive role in the high temperature strength and oxidation resistance. Finally, the fracture modes of the typical Nb/Nb 5 Si 3 /Cr 2 Nb microstructures under bending and compression conditions at room and high temperatures as well as the oxidation mechanism are described and discussed.
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Zhang et al. (2018) studied this question.
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