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首页> 外文期刊>Journal of Crystal Growth >Directional growth and characteriztion of Fe-Al-Nbeutectic alloys
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Directional growth and characteriztion of Fe-Al-Nbeutectic alloys

机译：Fe-Al-共晶合金的定向生长与表征

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摘要

The manufacturing of components for operaion at high temeprautres requries the use of metallic materials which cna keep satisfactoy mechanicla and chemicla properites, even at temperautrs beyond 100 deg C. An intereting alternative to solve such a problem is the use of directionally solidifed eutectic alloys. A potentially promising system for the manufacture of structural materials, andso far not totally studied, is the eutectic based on the Fe-Al-Nb system, which involves the (FeAl)_2Nb pahse and the FeAl solid solution. Eutectic samples formthis system were directionally solidified in a vertical Bridgman crystal groth unit. The objective of he experimens was to determine the infleunce of the grwoth rate on the eutectic microstructure. The ingots obtained weere investigated by using optical and electron scanning microscopy. At low growth rate, the eutectic microstructure remained regualr, even throgh it shwoed several types of microstructure defects. As the growth rate was increased, a transition form lamellawr to fibrous morphoogy was observed.
机译：在高温度条件下制造用于操作的部件需要使用即使在超过100摄氏度的温度下仍能保持令人满意的机械性能和化学性能的金属材料。解决此问题的一个有趣的替代方法是使用定向凝固的低共熔合金。基于Fe-Al-Nb系统的共晶是一种潜在的有前途的结构材料制造系统，到目前为止尚未进行全面研究，该系统涉及（FeAl）_2Nb弹性体和FeAl固溶体。该系统的共晶样品在垂直的Bridgman晶体泡沫单元中定向凝固。实验的目的是确定增长率对共晶微观结构的影响。通过使用光学和电子扫描显微镜研究获得的铸锭。在低增长率下，共晶微结构保持规则，甚至克服了几种类型的微结构缺陷。随着生长速率的增加，观察到了从薄片到纤维形态的过渡。

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