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首页> 外文期刊>Intermetallics >Microstructural refinement of boron-containing β -solidifying γ-titanium aluminide alloys through heat treatments in the (3 phase field
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Microstructural refinement of boron-containing β -solidifying γ-titanium aluminide alloys through heat treatments in the (3 phase field

机译：（3相场）热处理对含硼β凝固γ-铝化钛合金的显微组织细化

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摘要

The addition of B effectively supports the generation of fine and homogeneous microstructures in as-cast 3-solidifying y-based titanium aluminide alloys. The microstructural refinement in such alloys can be attributed to the borides acting as nucleation sites for new a grains during the solid-state (β ->α transformation (Hecht U, Witusiewicz V, Drevermann A, Zollinger J, Intermetallics 2008; 16: 969—978). In the current work it is shown that the cooling rate plays a crucial role in determining whether borides serve as nudeation sites for grain refinement. Surprisingly, if the cooling rate is too high then grain refinement by borides is hampered. The positive effect of borides can be used to obtain grain refinement in these materials by a simple heat treatment, even if the microstructure has been extensively coarsened through prior heat treatment.
机译：B的添加有效地支持了铸态的3凝固y基铝化钛合金中精细而均匀的微观结构的产生。此类合金的微观结构细化可归因于硼化物在固态过程中充当新a晶粒的成核位点（β→α相变（Hecht U，Witusiewicz V，Drevermann A，Zollinger J，Intermetallics 2008; 16：969 （978）。在目前的工作中，表明冷却速度在确定硼化物是否作为晶粒细化的裸晶部位方面起着至关重要的作用，令人惊讶的是，如果冷却速度太高，则硼化物对晶粒的细化会受到阻碍。即使通过先前的热处理已使组织粗化，也可以通过简单的热处理将硼化物的作用用于获得这些材料的晶粒细化。

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