The role of Fe and Ti additions in the microstructure of Nb-18Si-5Sn silicide-based alloys
The role of Fe and Ti additions in the microstructure of Nb-18Si-5Sn silicide-based alloys
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DOI：
10.1016/j.intermet.2007.06.001
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发表时间：
2007-12-01
期刊：
影响因子：
4.4
通讯作者：
Tsakiropoulos, P.
中科院分区：
文献类型：
--
作者：
Vellios, N.;Tsakiropoulos, P.
研究了Fe和Ti对Nb-24 Ti-18 Si-5 Fe-5Sn（NV 8）和Nb-45 Ti-15 Si-5 Fe-5Sn（NV 4）合金铸态和热处理后显微组织和硬度的影响。NV 8-AC的显微结构由（Nb，Ti）（ss）、（Nb，Ti）（3）Sn、（Nb，Ti）（5）Si-3、（Nb，Ti）（3）Si、FeNb 4Si和Fe 2Nb 3以及富Ti氧化物组成。NV 8-HT的显微组织由（Nb，Ti）（3）Si、（Nb，Ti）3Sn和富Ti氧化物组成。在NV 8中，Nb_5Si_3的形成不稳定，Nb_3Si的稳定性增强，Nb_5Si_3与固溶体之间的相互作用被抑制。NV 4-AC的显微组织为富Ti和富Nb固溶体、3-1和5-3硅化物。在NV 4-AC中没有形成在NV 8-AC中观察到的FeNb 4Si和Fe 2Nb 3相以及富Ti氧化物。组织由（Ti，Nb）（3）Sn、β（Ti，Nb）（ss）、（Ti，Nb）（3）Si和（Ti，Nb）（5）Si-3相组成。Fe在Ti基3-1硅化物中的溶解度显著低于Nb基3-1硅化物。在NV 4中，β（Ti，Nb）（ss）+（Ti，Nb）（5）Si-3 ->（Ti，Nb）（3）Si转变增强。讨论了Fe、Ti对Nb-18 Si-5Sn基合金硬度的影响，以及合金元素对Nb_3Sn、Ti_3Sn、Nb_3Si、Ti_3Si和Ti、Nb基5-3硅化物硬度的影响。(c)2007爱思唯尔有限公司保留所有权利。
The effects of Fe and Ti on the microstructure and hardness of the as cast and heat treated Nb-24Ti-18Si-5Fe-5Sn (NV8) and Nb-45Ti-15Si-5Fe-5Sn (NV4) alloys were studied. The microstructure of NV8-AC consisted of (Nb,Ti)(ss), (Nb,Ti)(3)Sn, (Nb,Ti)(5)Si-3, (Nb,Ti)(3)Si, FeNb4Si, and Fe2Nb3 and a Ti rich oxide. The microstructure of NV8-HT consisted of (Nb,Ti)(3)Si, (Nb,Ti)3Sn and the Ti rich oxide. In NV8 the formation of Nb5Si3 was destabilised, the stability of Nb3Si was enhanced and the entectic between Nb5Si3 and the solid solution was suppressed. The microstructure of NV4-AC contained Ti rich and Nb rich solid solutions, 3-1 and 5-3 silicides. The FeNb4Si and Fe2Nb3 phases and the Ti rich oxide observed in NV8-AC were not formed in NV4-AC. The microstructure of NV4-HT consisted of (Ti,Nb)(3)Sn, beta(Ti,Nb)(ss), (Ti,Nb)(3)Si and (Ti,Nb)(5)Si-3 phases. The solubility of Fe in the Ti-based 3-1 silicide was significantly lower than in the Nb-based 3-1 silicide. The beta(Ti,Nb)(ss) + (Ti,Nb)(5)Si-3 -> (Ti,Nb)(3)Si transformation was enhanced in NV4. The effects of Fe and Ti on the hardness of Nb-18Si-5Sn-based alloys, and of alloying elements on the hardness of Nb3Sn, Ti3Sn, and Nb3Si, Ti3Si, and Ti and Nb base 5-3 silicides are discussed. (c) 2007 Elsevier Ltd. All rights reserved.