STRENGTH AND DUCTILE-PHASE TOUGHENING IN THE 2-PHASE NB/NB5SI3 ALLOYS
STRENGTH AND DUCTILE-PHASE TOUGHENING IN THE 2-PHASE NB/NB5SI3 ALLOYS
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DOI：
10.1007/bf02667370
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发表时间：
1991-07-01
期刊：
影响因子：
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通讯作者：
DIMIDUK, DM
中科院分区：
文献类型：
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作者：
MENDIRATTA, MG;LEWANDOWSKI, JJ;DIMIDUK, DM
研究了热处理对Nb-10和16%Si（以原子百分比引用的成分）的Nb-Nb_5-Si_3两相合金的机械性能的影响。 这包括对铸态和热挤压产品形式的强度、延展性和韧性的评估。 这两个相在高达约1670 ℃时是热化学稳定的，在高达1500 ℃时几乎没有粗化，并且易于发生微观结构变化，包括形态和尺寸的变化。 所测得的力学性能和断口分析表明，在挤压条件下，终端Nb相可以提供显着的增韧的金属间化合物Nb 5Si 3基体的塑性拉伸，界面脱粘，和裂纹桥接机制。 已经进一步表明，在这些合金中，高水平的强度保持到1400 ℃。
The effect of heat treatment on the mechanical properties of Nb-Nb5-Si3 two-phase alloys having compositions Nb-10 and 16 pct Si (compositions quoted in atomic percent) has been investigated. This includes an evaluation of the strength, ductility, and toughness of as-cast and hot-extruded product forms. The two phases are thermochemically stable up to approximately 1670-degrees-C, exhibit little coarsening up to 1500-degrees-C, and are amenable to microstructural variations, which include changes in morphology and size. The measured mechanical properties and fractographic analysis indicate that in the extruded condition, the terminal Nb phase can provide significant toughening of the intermetallic Nb5Si3 matrix by plastic-stretching, interface-debonding, and crack-bridging mechanisms. It has been further shown that in these alloys, a high level of strength is retained up to 1400-degrees-C.