Liquidus projection of the Al–V–Zr system

IF 1.9 3区 材料科学 Q4 CHEMISTRY, PHYSICAL
Denis Felipe Barros , Chaia Nabil , Júlio César Pereira dos Santos , Danilo Alencar Abreu , Caio Simão Barros , Vitória Melo Silveira , Carlos Angelo Nunes , Gilberto Carvalho Coelho
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引用次数: 0

Abstract

Phase equilibria knowledge on the Al–V–Zr system has an important role for designing low-density Al-containing refractory multi-principal element alloys. In order to contribute to the literature data related to this system, the liquidus projection of the Al–V–Zr ternary system was experimentally investigated in this work by microstructural characterization of as-cast alloys. Sixty alloys were produced in an arc furnace, the microstructures of the as-cast alloys were characterized using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) for the determination of the chemical composition of the phases and microconstituents as well as X-ray diffractometry (XRD). The liquidus projection of the Al–V–Zr system is presented in this work for the first time in the literature. Through microstructural analysis and thermodynamic extrapolation, three Class I, eleven Class II and one Class III ternary invariant reactions are proposed. The results showed that the ternary compound Zr0.9V0.4Al2.7 is formed from the liquid through the following reaction: L + ZrAl2 → Zr0.9V0.4Al2.7. The limits of the 12 primary solidification regions are established and the nature of the monovariant and ternary invariant reactions are determined. The ZrAl2 primary solidification region significantly extends into the liquidus projection, participating in most reactions involving the other phases in equilibrium with the liquid.

Al-V-Zr 系统的液相投影
有关 Al-V-Zr 体系相平衡的知识对于设计低密度含铝难熔多主元素合金具有重要作用。为了丰富与该体系相关的文献数据,本研究通过对铸态合金进行显微结构表征,对 Al-V-Zr 三元体系的液相投影进行了实验研究。在电弧炉中生产了 60 种合金,并使用扫描电子显微镜 (SEM)、用于确定相和微成分化学成分的能量色散光谱 (EDS) 以及 X 射线衍射仪 (XRD) 对铸态合金的微观结构进行了表征。本研究首次在文献中介绍了 Al-V-Zr 系统的液相投影。通过微观结构分析和热力学推断,提出了三个 I 类、十一个 II 类和一个 III 类三元不变反应。结果表明,三元化合物 Zr0.9V0.4Al2.7 是通过以下反应从液体中形成的:L + ZrAl2 → Zr0.9V0.4Al2.7。确定了 12 个一次凝固区域的界限,并确定了一元不变反应和三元不变反应的性质。ZrAl2 主要凝固区域明显延伸到液相投影中,参与了涉及与液体平衡的其他相的大多数反应。
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来源期刊
CiteScore
4.00
自引率
16.70%
发文量
94
审稿时长
2.5 months
期刊介绍: The design of industrial processes requires reliable thermodynamic data. CALPHAD (Computer Coupling of Phase Diagrams and Thermochemistry) aims to promote computational thermodynamics through development of models to represent thermodynamic properties for various phases which permit prediction of properties of multicomponent systems from those of binary and ternary subsystems, critical assessment of data and their incorporation into self-consistent databases, development of software to optimize and derive thermodynamic parameters and the development and use of databanks for calculations to improve understanding of various industrial and technological processes. This work is disseminated through the CALPHAD journal and its annual conference.
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