Strength and toughness of a Nb/Nb5Si3 composite
Strength and toughness of a Nb/Nb5Si3 composite
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DOI：
10.1007/bf02657338
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发表时间：
1993-02
期刊：
影响因子：
--
通讯作者：
M. Mendiratta;D. Dimiduk
中科院分区：
文献类型：
--
作者：
M. Mendiratta;D. Dimiduk
[en] Recent studies have shown that within the Nb-Si system, the two-phase Nb/Nb 5 Si 3 microstructures exhibit excellent thermochemical stability and resistance to coarsening up to 1500 C. In addition, these Nb/Nb 5 Si 3'in situ composites' exhibit a good balance in mechanical properties, having a reasonably high strength up to 1500 C and high fracture toughness at room temperature. These combined properties of the composites provide an attractive basis for developing high-temperature structural materials. Studies are currently underway on creep mechanisms and alloying to enhance the oxidation resistance of these composites. Most of the published results on this system pertain to the wrought Nb-10 at. pct Si alloy in which the large primary Nb particles provide toughening while the intermetallic Nb 5 Si 3 phase in the eutectoid microconstituent provides high-temperature strength. The present work was undertaken to determine the strength and toughness of a wrought alloy with near-eutectic composition, Nb-1.65 at. pct Si, at temperatures from 25 C to 1500 C. The increased Si content is known to decrease the volume fraction of the primary Nb particles and increase the overall volume fraction of the Nb 5 Si 3 intermetallic phase
