首页> 外文期刊>Journal of Materials Engineering and Performance >On the Microstructure and Solidification Behavior of N-Bearing Ti-46Al-8Ta (at.%) Intermetallic Alloys
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On the Microstructure and Solidification Behavior of N-Bearing Ti-46Al-8Ta (at.%) Intermetallic Alloys

机译:n轴承Ti-46Al-8Ta(attm)金属间合金的微观结构和凝固性能

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摘要

Ti-46Al-8Ta (at.%) intermetallic alloys exhibit acceptable strength at low and high temperatures with good oxidation resistance. Different alloying elements are usually added to TiAl-based alloys to develop required properties. In this work, effects of N addition up to 2 at.% on microstructural features and solidification behavior of the Ti-46Al-8Ta alloy is investigated. The achieved results showed that alloying with N causes dendrite refinement and reduction of the retained metastable B2 phase in the as-cast microstructure. The dendrite morphology is also changed from fourfold to fivefold and then sixfold symmetry by increasing N content. The effect of N on interlamellar spacing, amount of constituent phases, and lattice parameters was not uniform. Increasing N content resulted in an increase in both small punch maximum load and hardness up to 1.05 at.%, whereas further N alloying, despite increasing of hardness, led to a drop in the maximum load.
机译:Ti-46Al-8TA(AT.%)金属间合金在低温和高温下具有良好的抗氧化性的可接受的强度。 通常将不同的合金元素添加到基于Tial基合金中以产生所需的性质。 在这项工作中,研究了N添加的效果。%对Ti-46A-8TA合金的微观结构特征和凝固行为进行了研究。 所达到的结果表明,用N的合金化导致枝晶细化和在铸造微观结构中降低保留的亚稳态B2相。 枝晶形态也从四倍变为五倍,然后通过增加n内容来改变为六倍对称性。 n对层间间距,组成相的影响和晶格参数的影响并不均匀。 增加N内容导致小冲击最大负载和硬度增加到1.05的硬度。%,尽管硬度增加,但是在最大载荷的下降导致下降。

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