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首页> 外文期刊>Intermetallics >In-situ neutron diffraction of titanium silicide, Ti_5Si_3, during self-propagating high-temperature synthesis (SHS)
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In-situ neutron diffraction of titanium silicide, Ti_5Si_3, during self-propagating high-temperature synthesis (SHS)

机译：自蔓延高温合成（SHS）期间硅化钛Ti_5Si_3的原位中子衍射

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摘要

Self-propagating high-temperature synthesis (SHS) has potential for the efficient production of high melting temperature intermetallics such as Ti_5Si_3. However, the process is poorly understood due to the difficulty of making in situ observations. In this research, the self-propagating synthesis of Ti_5Si_3 from furnace ignited elemental samples was studied using high-speed in situ neutron powder diffraction. Diffraction patterns were recorded at 0.9 s time-resolution during heating at > 100 K/s. Despite the existence of four other titanium silicides (TiSi_2, TiSi. Ti_5Si_4, Ti_3Si) evidence of these or other intermediate phases was not found in either the pre-heating or reaction stages of the process. The reaction is, however, narrowly preceded by the alpha- >beta transformation in Ti, which initiates interdiffusion and acts as a trigger for SHS ignition. The formation of Ti_5Si_3 appears to occur by the direct solid state reaction of beta-Ti and Si.
机译：自蔓延高温合成（SHS）具有有效生产高熔点金属间化合物（例如Ti_5Si_3）的潜力。但是，由于难以进行原位观测，因此对该过程的了解很少。在这项研究中，使用高速原位中子粉末衍射研究了由炉点火的元素样品自蔓延合成Ti_5Si_3的过程。在大于100 K / s的加热条件下，以0.9 s的时间分辨率记录了衍射图。尽管存在其他四种硅化钛（TiSi_2，TiSi，Ti_5Si_4，Ti_3Si），但在该过程的预热或反应阶段均未发现这些或其他中间相的证据。但是，该反应在Ti的α->β转换之前进行，该转换会引发相互扩散并触发SHS点火。 Ti_5Si_3的形成似乎是由β-Ti和Si的直接固态反应发生的。

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