A composition window in the TiAl–Mo–Si system suitable for lamellar structure control through seeding and directional solidification
A composition window in the TiAl–Mo–Si system suitable for lamellar structure control through seeding and directional solidification
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DOI：
10.1016/s0921-5093(01)01495-2
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发表时间：
2002-06
期刊：
影响因子：
6.4
通讯作者：
H. Lee;D. R. Johnson;H. Inui;M. Oh;D. Wee;M. Yamaguchi
中科院分区：
文献类型：
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作者：
H. Lee;D. R. Johnson;H. Inui;M. Oh;D. Wee;M. Yamaguchi
研究了铸造Ti-46 Al-1.5Mo-（0-3）Si（at.%）层状组织的热稳定性合金的研究，以找到合适的晶种组合物，用于通过引晶和定向凝固生长具有对齐的层状微观结构的这些合金的锭。为了成功地进行引晶，在加热到熔化温度和从熔化温度冷却时，必须恢复层状微观结构的原始取向。在这项研究中，层状稳定性是通过检查是否在铸态合金的层状结构被保存后快速加热到略低于熔化温度，保持，然后冷却到室温。发现对于大于1.0原子%的Si含量满足该要求。Ti-46Al-1.5Mo-1Si和Ti-46Al-1.5Mo-1.5Si（at.%）合金是可用作晶种材料的合金的典型实例。以Ti-46 Al-1.5Mo-1.5Si合金为晶种材料，对Ti-46 Al-1.5Mo-1.5Si合金进行了定向凝固实验，获得了具有定向片层组织的铸锭。
The thermal stability of the lamellar microstructure of cast Ti–46Al–1.5Mo–(0–3)Si (at.%) alloys was investigated to find suitable seed compositions for growing ingots of these alloys with the aligned lamellar microstructure through seeding and directional solidification. In order for the seeding to be made successfully, the original orientation of the lamellar microstructure must be restored upon heating to and cooling from the melting temperature. In this study, the lamellar stability was determined by examining whether or not the lamellar structure in the as-cast alloys is preserved after quickly heating to just below melting temperature, holding, and then cooling to room temperature. This requirement was found to be fulfilled for the Si contents larger than 1.0 at.%. Ti–46Al–1.5Mo–1Si and Ti–46Al–1.5Mo–1.5Si (at.%) alloys are typical examples of alloys which can be used as seed materials. Directional solidification experiments of Ti–46Al–1.5Mo–1Si alloy were performed using Ti–46Al–1.5Mo–1.5Si alloy as a seed material and ingots with the aligned lamellar microstructure were obtained.