Fracture toughness of a hot-extruded multiphase Nb–10Si–2Fe in situ composite

Fracture toughness of a hot-extruded multiphase Nb–10Si–2Fe in situ composite
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热挤压多相Nb-10Si-2Fe原位复合材料的断裂韧性

DOI:
10.1016/j.scriptamat.2009.05.039
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发表时间:
2009-09
期刊:
影响因子:
6
通讯作者:
J.L. Yu
J.L. Yu
中科院分区:
材料科学1区
文献类型:
--
作者:
K.F. Zhang;J.L. Yu

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多相Nb-10 Si-2Fe(at.%)的热挤压在1600°C下以30:1的挤出比进行原位复合。研究了烧结态和热挤压+热处理态复合材料的断裂韧性。在挤压状态下,Nb_4Fe_3Si_5和Nb_4Fe_3Si_5相通过塑性拉伸、界面脱粘和裂纹桥接等机制对复合材料起到了显著的增韧作用。热处理对该复合材料的显微组织的影响表明,显微组织在高达1700°C时几乎没有粗化。
Hot extrusion of a multiphase Nb–10Si–2Fe (at.%) in situ composite was performed at 1600°C with an extrusion ratio of 30:1. The fracture toughness of the as-sintered and hot-extruded+heat-treated composite was investigated. In the extruded condition, the Nbss and Nb4Fe3Si5phase can provide significant toughening of this composite by plastic stretching, interface decohesion and crack bridging mechanisms. The effect of heat treatment on the microstructure of this composite indicates that the microstructures exhibit little coarsening up to 1700°C.
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