Synthesis of Ti–5Al–2.5Fe Alloy and Its Hydride by HC and SHS Methods

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2024-01-18 DOI:10.3103/S1061386223040088

D. Mayilyan, A. Aleksanyan

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Abstract

The aim of this investigation was to synthesis Ti–5Al–2.5Fe alloy by “hydride cycle” (HC) method. The crystal structure of obtained alloy was studied by powder X-ray diffraction. It was found that the alloy was a near α-alloy containing main α phase (hexagonal close-packed structure, space group 194: P6₃/mmc) and small amount of β phase (body-centered cubic structure, space group 229: Im-3m). The microstructure of obtained materials was studied using scanning electron microscope (SEM) in a back-scattered electron (BSE) mode. On the SEM image of the synthesized compacted alloy no cracks and pores were observed. The SEM measurements showed that the particles synthesized hydride have size distribution in the range of 1–10 μm. Energy dispersive X-ray spectrometry (EDS) analysis showed that the chemical compositions of observed main grey phase were close to the nominal composition of Ti–5Al–2.5Fe α-phase. The hydride of Ti–5Al–2.5Fe alloy was synthesized by self-propagating high temperature synthesis (SHS) method. It was shown that Ti–5Al–2.5Fe tablets reacted with hydrogen without preliminary crushing in SHS mode at range of hydrogen pressure P(H₂) = 1–2.5 MPa. Hydrogen capacity of synthesized (Ti–5Al–2.5Fe)H_1.45 hydride was equal to 3.04 wt %. The density of synthesized alloy before (ρ₁ = 4.0487 g/cm³) and after (ρ₂ = 4.2511 g/cm³) the repeating of hydrogenation–dehydrogenation cycle was measured. It was found that as a result of cycle the density of sample was increased by 5%.

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用 HC 和 SHS 方法合成 Ti-5Al-2.5Fe 合金及其氢化物

摘要本研究旨在通过 "氢化物循环"（HC）法合成 Ti-5Al-2.5Fe 合金。通过粉末 X 射线衍射研究了所获得合金的晶体结构。研究发现，合金是一种近似 α 的合金，含有主要的 α 相（六方紧密堆积结构，空间群 194：P63/mmc）和少量的 β 相（体心立方结构，空间群 229：Im-3m）。利用扫描电子显微镜（SEM）在背散射电子（BSE）模式下研究了所得材料的微观结构。在合成的致密合金的扫描电镜图像上，没有观察到裂缝和气孔。扫描电镜测量结果表明，合成氢化物的颗粒大小分布在 1-10 μm 之间。能量色散 X 射线光谱（EDS）分析表明，观察到的灰色主相的化学成分接近于 Ti-5Al-2.5Fe α 相的标称成分。Ti-5Al-2.5Fe 合金的氢化物是通过自蔓延高温合成（SHS）法合成的。结果表明，在氢压 P(H2) = 1-2.5 MPa 的范围内，Ti-5Al-2.5Fe 片在 SHS 模式下无需初步破碎即可与氢发生反应。合成的（Ti-5Al-2.5Fe）H1.45 氢化物的氢容量为 3.04 wt %。在重复氢化-氢化循环之前（ρ1 = 4.0487 g/cm3）和之后（ρ2 = 4.2511 g/cm3），测量了合成合金的密度。结果发现，循环后样品的密度增加了 5%。

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来源期刊

International Journal of Self-Propagating High-Temperature Synthesis MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

33.30%

发文量

期刊介绍： International Journal of Self-Propagating High-Temperature Synthesis is an international journal covering a wide range of topics concerned with self-propagating high-temperature synthesis (SHS), the process for the production of advanced materials based on solid-state combustion utilizing internally generated chemical energy. Subjects range from the fundamentals of SHS processes, chemistry and technology of SHS products and advanced materials to problems concerned with related fields, such as the kinetics and thermodynamics of high-temperature chemical reactions, combustion theory, macroscopic kinetics of nonisothermic processes, etc. The journal is intended to provide a wide-ranging exchange of research results and a better understanding of developmental and innovative trends in SHS science and applications.