Dual multi-phase intermetallic alloys composed of geometrically close-packed Ni3X (X: Al, Ti and V) type structures – I. Microstructures and their stability
Dual multi-phase intermetallic alloys composed of geometrically close-packed Ni3X (X: Al, Ti and V) type structures – I. Microstructures and their stability
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DOI：
10.1016/j.actamat.2005.10.014
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发表时间：
2006-02
期刊：
影响因子：
9.4
通讯作者：
Y. Nunomura;Y. Kaneno;H. Tsuda;T. Takasugi
中科院分区：
文献类型：
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作者：
Y. Nunomura;Y. Kaneno;H. Tsuda;T. Takasugi
研究了由L12、do22和do24相组成的Ni3Al-Ni3Ti-Ni3V伪三元系金属间合金的组织和显微组织。特别强调的是钛含量相对较低的合金。对这些合金进行高温退火后，在微米尺度上形成由L12+A1相组成的两相组织。这种微观结构还可以通过低于共析温度退火时发生的分解反应来细化，根据分解反应，Al相转变为L12+ do22相。通过这种方法，在亚微米尺度上形成了一种新的微观结构。双多相金属间合金的组成相l12和d022不仅在微米尺度上，而且在亚微米尺度上都表现出高度共格的界面结构，并在高温下表现出较高的显微组织稳定性。
The constitution and microstructure of intermetallic alloys based on the Ni3Al–Ni3Ti–Ni3V pseudo-ternary system and composed of the phases L12, DO22and DO24were investigated. Particular emphasis is paid to alloys with a relatively low Ti content. High-temperature annealing of these alloys leads to the formation of a two-phase microstructure at the micron-scale, which consists of the phases L12+A1. This microstructure can additionally be refined by a decomposition reaction occurring upon annealing below the eutectoid temperature, according to which the Al phase is transformed into the L12+DO22phases. In this way, a novel microstructure is formed at the sub-micron scale. The dual multi-phase intermetallic alloys exhibit highly coherent interface structures between the constituent phases of L12and D022not only at a micron scale but also at a sub-micron scale and also display high microstructural stability at high temperature.