The use of titanium hydride as a raw material has been an attractive alternative for the production of titanium components produced by powder metallurgy, due to increased densification of Ti compacts, greater control of contamination and cost reduction of the raw materials. However, a significant amount of hydrogen that often remains on the samples could generate degradation of the mechanical properties. Therefore, understanding decomposition mechanisms is essential to promote the components’ long life. Several studies on titanium hydride (TiH₂) decomposition have been developed; nevertheless, few studies focus on the effect of the alloying elements on the dehydrogenation process. In this work, the effects of the addition of different amounts of Fe (5 and 7 wt. %) and Nb (12, 25, and 40 wt. %) as alloying elements were evaluated in detail. Results suggest that α→β transformation of Ti occurs below 800 °C; β phase can be observed at lower temperature than the expected according to the phase diagram. It was found that β phase transformation could take place during the intermediate stage of dehydrogenation. A mechanism was proposed for the effect of allying elements on the dehydrogenation process.

中文翻译：

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由氢化钛生产的Beta钛合金：合金元素对氢化钛分解的影响

使用氢化钛作为原材料已经成为生产粉末冶金生产的钛组件的一种有吸引力的替代方法，这是因为增加了Ti压坯的致密性，更好地控制了污染并降低了原材料的成本。但是，经常残留在样品上的大量氢气会导致机械性能下降。因此，了解分解机制对于延长组件的使用寿命至关重要。氢化钛（TiH ₂）已分解 但是，很少有研究关注合金元素对脱氢过程的影响。在这项工作中，详细评估了添加不同量的Fe（5和7 wt。％）和Nb（12、25和40 wt。％）作为合金元素的效果。结果表明，在低于800°C时会发生Ti→α→β转变。根据相图，可以在比预期更低的温度下观察到β相。发现在脱氢的中间阶段可能发生β相转变。提出了一种影响合金元素对脱氢过程影响的机理。