Design of low-cost titanium aluminide intermetallics

Design of low-cost titanium aluminide intermetallics
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低成本铝化钛金属间化合物的设计

DOI:
10.1016/j.jallcom.2015.03.239
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发表时间:
2015-08
影响因子:
6.2
通讯作者:
He, Yuehui
He, Yuehui
中科院分区:
材料科学2区
文献类型:
--
作者:
Zhou, Canxu;Li, Jianbo;Li, Huizhong;He, Yuehui

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对于铝化钛(TiAl)合金来说,由于其加工性很低,其成本的高主要来自于成形过程。引入β相是优化可加工性的有效途径。在本研究中,开发了一种新型的含有廉价β稳定元素Mo和Fe的TiAl合金材料。对新合金的变形行为进行了表征,并对进一步添加间隙元素合金化以改善高温性能进行了探索。结果表明,所设计的Ti-45Al-3Fe-2Mo合金具有良好的耐高温性能。合金具有细晶β稳定组织。它显示了一个宽的锻造窗口,为工业锻造工艺提供了基础。良好的变形性能源于β相的动态再结晶和变形诱导的β→α2+ γ相变。添加0.5% C可显著改善合金的蠕变性能,这主要是由于β相数量减少和p型碳化物的析出所致。
For titanium aluminide (TiAl) alloys, the high cost mainly comes from the forming process since the workability of TiAl alloys is quite low. To optimize the workability, introduction of β phase is an effective way. In the present study, a novel TiAl material alloyed with cheap β-stabilizing elements, Mo and Fe, was developed. The deformation behavior of the new alloy was characterized, and further alloying with interstitial elements to improve the high temperature properties was explored. Results show that the designed Ti–45Al–3Fe–2Mo at.% alloy has a fine grain β-stabilized microstructure. It shows a wide forging window, providing the foundation for an industrial forging process. The good deformability is derived from dynamic recrystallization of β phase and deformation-induced β → α2+ γ transformation. With the addition of 0.5% C, the creep properties can be significantly improved, which is mainly caused by the decrease in the amount of β phase and the precipitation of P-type carbides.
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影响因子: 2.3
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