Microstructure and mechanical properties of gamma TiAl based alloys produced by combustion synthesis plus compaction route
Microstructure and mechanical properties of gamma TiAl based alloys produced by combustion synthesis plus compaction route
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DOI：
10.1016/j.intermet.2008.08.007
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发表时间：
2008-11-01
期刊：
影响因子：
4.4
通讯作者：
Pambaguian, L.
中科院分区：
文献类型：
--
作者：
Agote, I.;Coleto, J.;Pambaguian, L.
研究了化学成分为Ti-48Al-2Cr-2Nb （at.%）的γ - tial合金的显微组织和力学性能。该合金采用燃烧合成+压实工艺一步制备，其中合成和成型同时进行。采用了两种不同的燃烧方式：强迫自传播高温合成+压实（FSHS + C）和热爆炸+压实（TE + C）。经过适当的均匀化热处理后，两种工艺路线均可获得完全的片层组织。然而，TE + C路线显示较粗的片层菌落。通过FSHS + C途径合成的样品氧含量显著降低。拉伸性能（特别是UTS）与传统加工路线获得的其他合金在同一范围内，然而，获得的延展性较低。获得了良好的蠕变和疲劳性能。所有断口均表现为脆性断裂机制。最后，发现所研究的加工路线作为γ - tial基合金的替代制造技术具有良好的效果。(C) 2008 Elsevier Ltd版权所有。
Microstructure and mechanical properties of gamma-TiAl alloy with the chemical composition Ti-48Al-2Cr-2Nb (at.%) have been investigated. The alloy was prepared in one step using a combustion synthesis + compaction process, where the synthesis and the shaping take place at the same time. Two different combustion routes were used: forced self-propagating high-temperature synthesis + compaction (FSHS + C) and thermal explosion + compaction (TE + C).Fully lamellar microstructure was obtained in both processing routes after the appropriate homogenisation thermal treatment. Nevertheless, TE + C route showed coarser lamellar colonies. A remarkable oxygen content reduction was achieved in samples synthesised by FSHS + C route. Tensile properties (especially UTS) were found to be in the same range as other alloys obtained by conventional processing routes, however, low ductility was achieved. Good creep and fatigue properties were obtained. All fracture surfaces showed a brittle fracture mechanism. Finally, it was found out that the studied processing routes showed promising results as an alternative manufacturing technology for gamma-TiAl based alloys. (C) 2008 Elsevier Ltd. All rights reserved.