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研究目的在于优化Ti0.8-0.9V0.2-0.1二元合金的相结构成分、微观组织和储氢性能。该合金主要用于从含有大量一氧化碳的高温气态混合物中吸收氢气。Ti0.8-0.9V0.2-0.1合金中的α-(HCP)和β-(BCC)相在纯氢气中基于氢化作用,形成单相FCC结构的氢化物,此过程与合金的化学成分无关。同步辐射X射线衍射的原位分析表明,在含有氢气和10%一氧化碳的混合气体中,只有β相转变成相应的氢化物。快速凝固(RS)处理细化了Ti0.8V0.2和Ti0.9V0.1合金的晶粒组织,而且,快速凝固处理增加了Ti0.9V0.1合金中的β相,其所占比例是普通熔铸条件下的两倍。扫描电子显微镜(SEM)分析表明,Ti0.9V0.1合金含有片状组织,层片的厚度约为300nm。热脱附谱(TDS)显示,微观组织的细化可以加快氢脱附的动力学过程。
The purpose of this study is to optimize the phase composition, microstructure and hydrogen storage of Ti0.8-0.9V0.2-0.1 binary alloy. The alloy is mainly used to absorb hydrogen gas from a high-temperature gaseous mixture containing a large amount of carbon monoxide. The alpha (HCP) and beta (BCC) phases in Ti0.8-0.9V0.2-0.1 alloys are hydrogenated in pure hydrogen to form hydrides of single-phase FCC structures, regardless of the chemical composition of the alloy . In-situ synchrotron radiation X-ray diffraction analysis showed that in the mixed gas containing hydrogen and 10% carbon monoxide, only the β phase is converted into the corresponding hydride. Rapid solidification (RS) refinement of Ti0.8V0.2 and Ti0.9V0.1 alloy grain structure, and rapid solidification increased Ti0.9V0.1 alloy phase, the proportion of the ordinary Double casting under casting conditions. Scanning electron microscopy (SEM) analysis showed that the Ti0.9V0.1 alloy contains lamellar structure and the thickness of the lamella is about 300 nm. Thermal desorption spectroscopy (TDS) shows that the refinement of microstructure can accelerate the kinetic process of hydrogen desorption.