Phase relation and microstructure in multi-phase intermetallic alloys based on Ni3Al-Ni3Ti-Ni3V pseudo-ternary alloy system
Phase relation and microstructure in multi-phase intermetallic alloys based on Ni3Al-Ni3Ti-Ni3V pseudo-ternary alloy system
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DOI：
10.1016/j.intermet.2003.12.011
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发表时间：
2004-04-01
期刊：
影响因子：
4.4
通讯作者：
Takasugi, T
中科院分区：
文献类型：
--
作者：
Nunomura, Y;Kaneno, Y;Takasugi, T
采用光学显微镜、X射线衍射仪、差示扫描量热仪和扫描电子显微镜（附波长色散谱仪）研究了Ni 3Al-Ni 3 Ti-Ni 3V伪三元合金系在1273和1373 K下的相关系和显微组织。在1273 K下，L1（2）（Ni 3Al），D 0（24）（Ni 3 Ti），D 0（22），（Ni 3V）和菱方体（Ni 3 Ti 0.7V 0.3）作为组成金属间化合物相，它们的相场依赖于组成原子的电子浓度（e/a）和原子尺寸因子（R-x/R-Ni）。在1273 K时发现的四种金属间化合物中，（即L1（2）-D 0（24），D 0（24）-菱形，菱形-D 0（22）-D 0（22）-D 0（24）和D 0（22）-L1（2（即L1（2）-D 0（24）-D 0（22）和D 0（24）菱面体D 0（22））。此外，D 024（Ni 3 Ti）相延伸到浓度场，其中大部分组成Ti元素被Al和V元素取代，保持它们的浓度相同。所制备的合金表现出广泛不同的微观结构，这取决于合金成分和温度。在低Ti浓度区，通过共晶反应形成了由L1（2）+D 0（24）+ A1（-->L1（2）+D 0（22））组成的双相组织。(C)2004爱思唯尔有限公司保留所有权利。
The phase relation and microstructure of alloys based on the Ni3Al-Ni3Ti-Ni3V pseudo-ternary alloy system at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, differential scanning calorimetry and scanning electron microscopy (attached with a wavelength dispersive spectroscope). As the constituent intermetallic phases at 1273 K, L1(2)(Ni3Al), D0(24)(Ni3Ti), D0(22),(Ni3V) and rhombohedral (Ni3Ti0.7V0.3) were identified and then their phase fields were shown to depend upon the electron concentration (e/a) and the atomic size factor (R-x/R-Ni) of the constituent atoms. Among four intermetallic phases identified at 1273 K, five kinds of two-phase relations (i.e. L1(2)-D0(24), D0(24)-rhombohedral, rhombohedral-D0(22) D0(22)-DO24 and D0(22)-L1(2)) and two kinds of three-phase relations (i.e. L1(2)-D0(24)-D0(22) and D0(24) rhombohedral D0(22)) were found to exist. Also, D024 (Ni3Ti) phase extended up to concentration field in which a majority of constituent Ti elements were replaced by Al and V elements, keeping their concentrations identical. The prepared alloys exhibited widely different micro structures, depending on alloy composition and temperature. In the low Ti concentration region, dual multi-phase microstructures composed of L1(2) + D0(24) + A1 (-->L1(2) + D0(22)) were formed by a eutectic reaction. (C) 2004 Elsevier Ltd. All rights reserved.