Experimental Determination of the Isothermal Sections and Liquidus Surface Projection of the Co–V–Zr System

Jiaxing Sun, Cuiping Guo, Changrong Li, Zhenmin Du
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Abstract

The construction of the experimental liquidus surface projection and isothermal sections of the Co–V–Zr ternary system was based on the analyses of solidification microstructures and phase constituents. A new compound τ with Cr0.5Fe1.5Zr-type was identified, and the measured composition range of Zr in τ was ∼ 28.6 to 57.3 at. pct and 32.9 to 56.8 at. pct at 1100 °C and 1000 °C, respectively. The liquidus surface projection identified nine primary solidification areas, while two primary solidification areas were inferred from binary diagrams. Moreover, eight and ten three-phase equilibria were determined at 1100 °C and 1000 °C, respectively. The measured solubility of V in Co23Zr6, Co2Zr and CoZr reached ~ 0.5, 7.6 and 4.1 at. pct at 1100 °C. Meanwhile, the solubility of V in Co23Zr6, Co2Zr, CoZr and CoZr2 was measured to be ~ 0.4, 7.6, 1.6 and 3.6 at. pct at 1000 °C. The solubility of Zr in Co2V3 was ~ 3.6 at. pct at 1100 °C, while the solubility of Zr in Co3V, Co2V3 and CoV3 was determined ~ 1.3, 3.0 and 4.5 at. pct at 1000 °C, respectively. The experimental data can help improve the thermodynamic parameters of the Co–V–Zr system and advance the development of databases for multi-component Co-based superalloys.

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Co-V-Zr 系统等温截面和液面投影的实验测定
根据凝固微观结构和相成分分析,构建了 Co-V-Zr 三元体系的实验液面投影和等温截面。在 1100 ℃ 和 1000 ℃ 时,发现了一种新的 Cr0.5Fe1.5Zr 型化合物 τ,τ 中 Zr 的测量成分范围分别为 ∼ 28.6 至 57.3 % pct 和 32.9 至 56.8 % pct。液面投影确定了九个主要凝固区域,而从二元图中推断出两个主要凝固区域。此外,在 1100 °C 和 1000 °C 时分别确定了 8 个和 10 个三相平衡。在 1100 °C时,测得的V在Co23Zr6、Co2Zr和CoZr中的溶解度分别达到~ 0.5、7.6和4.1%。同时,在 1000 ℃ 时,测得 V 在 Co23Zr6、Co2Zr、CoZr 和 CoZr2 中的溶解度分别为约 0.4、7.6、1.6 和 3.6%。在 1100 ℃ 时,锆在 Co2V3 中的溶解度为 ~ 3.6 at. pct,而在 1000 ℃ 时,锆在 Co3V、Co2V3 和 CoV3 中的溶解度分别为 ~ 1.3、3.0 和 4.5 at. pct。这些实验数据有助于改进 Co-V-Zr 系统的热力学参数,并推动多组分 Co 基超合金数据库的开发。
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