Microstructural evolution and mechanical properties of Nb-Si-Cr ternary alloys with a tri-phase Nb/Nb5Si3/Cr2Nb microstructure fabricated by spark plasma sintering
Microstructural evolution and mechanical properties of Nb-Si-Cr ternary alloys with a tri-phase Nb/Nb5Si3/Cr2Nb microstructure fabricated by spark plasma sintering
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放电等离子烧结三相Nb/Nb5Si3/Cr2Nb显微组织Nb-Si-Cr三元合金的显微组织演变和力学性能
DOI：
10.1016/j.pnsc.2018.09.001
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
J. B. Sha
中科院分区：
文献类型：
--
作者：
Shasha Zhan;Wei Liu;J. B. Sha
以Nb、Nb 5Si 3和Laves Cr2 Nb复合粉末为原料，采用放电等离子烧结（SPS）技术制备了Nb-Si-Cr三元合金。全面评价了Nb-Si-Cr三元合金的室温断裂韧性、高温强度和抗氧化性等组织和性能与Nb/Nb 5Si 3/Cr2 Nb相体积分数组合的关系。结果表明，采用SPS工艺可获得致密度大于98.42%的Nb-Si-Cr三元合金样品，样品均由Nb、Nb 5Si 3和Cr2 Nb相组成，且分布均匀。Nb/Nb_5Si_3/Cr_2Nb显微组织的断裂韧性KQ随Nb含量的增加而自然增加，其中Nb相占主导地位。结果表明，随着硬化Nb 5Si 3含量的增加，合金的室温维氏硬度和高温强度均呈单调增加的趋势。有趣的是，二元Cr2 Nb相在高温强度和抗氧化性中起着积极的作用。最后，描述和讨论了典型Nb/Nb 5Si 3/Cr2 Nb组织在室温和高温弯曲和压缩条件下的断裂模式以及氧化机理。
In this work, pure Nb, Nb5Si3and Laves Cr2Nb 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/Nb5Si3/Cr2Nb 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, Nb5Si3and Cr2Nb phases that were distributed homogeneously. The fracture toughnessKQof the Nb/Nb5Si3/Cr2Nb 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 Nb5Si3fraction. Interestingly, the binary Cr2Nb phase played a positive role in the high temperature strength and oxidation resistance. Finally, the fracture modes of the typical Nb/Nb5Si3/Cr2Nb 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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DOI：
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