材料科学
相(物质)
微观结构
透射电子显微镜
铌
合金
严重塑性变形
结晶学
扫描电子显微镜
冶金
分析化学(期刊)
复合材料
化学
纳米技术
色谱法
有机化学
作者
Anna Korneva,Boris B. Straumal,Askar Kilmametov,А. С. Горнакова,Anna Wierzbicka-Miernik,Lidia Lityńska‐Dobrzyńska,R. Chulist,Ł. Gondek,Grzegorz Cios,P. Zięba
出处
期刊:Materials
[Multidisciplinary Digital Publishing Institute]
日期:2021-04-27
卷期号:14 (9): 2262-2262
被引量:9
摘要
It is well known that severe plastic deformation not only leads to strong grain refinement and material strengthening but also can drive phase transformations. A study of the fundamentals of α → ω phase transformations induced by high-pressure torsion (HPT) in Ti–Nb-based alloys is presented in the current work. Before HPT, a Ti–3wt.%Nb alloy was annealed at two different temperatures in order to obtain the α-phase state with different amounts of niobium. X-ray diffraction analysis, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were applied for the characterisation of phase transitions and evolution of the microstructure. A small amount of the β-phase was found in the initial states, which completely transformed into the ω-phase during the HPT process. During HPT, strong grain refinement in the α-phase took place, as did partial transformation of the α- into the ω-phase. Therefore, two kinds of ω-phase, each with different chemical composition, were obtained after HPT. The first one was formed from the β-phase, enriched in Nb, and the second one from the α-phase. It was also found that the transformation of the α-phase into the ω-phase depended on the Nb concentration in the α-Ti phase. The less Nb there was in the α-phase, the more of the α-phase was transformed into the ω-phase.
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