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首页> 外文期刊>Journal of Materials Engineering and Performance >Evaluation of Microstructure and Phase Relations in a Powder Processed Ti-44Al-12Nb Alloy
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Evaluation of Microstructure and Phase Relations in a Powder Processed Ti-44Al-12Nb Alloy

机译：粉末加工Ti-44Al-12Nb合金的显微组织和相关系的评估

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摘要

Titanium aluminides based on the ordered face-centered tetragonal gamma TiAl phase possess attractive properties, such as low density, high melting point, good elevated temperature strength, modulus retention, and oxidation resistance, making these alloys potential high-temperature structural materials. These alloys can be processed by both ingot metallurgy and powder metallurgy routes. In the present study, three variations of the powder metallurgy route were studied to process a Ti-44Al-12Nb (at. percent) alloy: (a) cold pressing followed by reaction sintering (CPprocess); (b) cold pressing, vacuum hot pressing, and then sintering (HP process); and (c) arc melting, hydride-dehydride process to make the alloy powder, cold isostatic pressing, and then sintering (AM process). Microstructural and phase relations were studied by x-ray diffraction (XRD) analysis, optical microscopy, scanning electron microscopy with an energy-dispersive spectrometer (SEM-EDS), and electron probe microanalysis (EPMA). The phases identified were Ti_3Al and TiAl; an additional Nb_2Al phase was observed In the HP sample. The microstructures of CP and HP processed samples are porous and chemically inhomogeneous whereas the AM processed sample revealed fine equlaxed microstructure. This refinement of the microstructure is attributed to the fine, homogeneous powder produced by the hydride-dehydride process and the high compaction pressures.
机译：基于有序面心四方γTiAl相的铝化钛具有吸引人的特性，例如低密度，高熔点，良好的高温强度，模量保持性和抗氧化性，使这些合金成为潜在的高温结构材料。这些合金可以通过铸锭冶金和粉末冶金工艺进行加工。在本研究中，研究了粉末冶金路线的三种变化形式来加工Ti-44Al-12Nb（原子百分比）合金：（a）冷压，然后进行反应烧结（CP工艺）; （b）冷压，真空热压，然后烧结（HP工艺）; （c）电弧熔化，氢化物-脱水过程以制造合金粉末，冷等静压，然后烧结（AM过程）。通过X射线衍射（XRD）分析，光学显微镜，带能谱仪（SEM-EDS）的扫描电子显微镜和电子探针显微分析（EPMA）研究了微观结构和相关系。鉴定出的相是Ti_3Al和TiAl。在HP样品中观察到另外的Nb_2Al相。 CP和HP处理过的样品的微观结构是多孔的，化学上是不均匀的，而AM处理过的样品则显示出良好的平衡微结构。微观结构的这种细化归因于通过氢化物-脱水过程产生的细小，均匀的粉末以及高的压实压力。

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