A systematic experimental investigation on nitrogen solubility in Ni(l) was conducted over 0 to 20 atm N2 and 1500 °C to 1750 °C using a precisely temperature-controlled (± 0.5 °C) induction furnace. Sieverts’ law is validated for nitrogen solubility in Ni(l) at pressures up to 20 atm, and highly self-consistent standard Gibbs energy <InlineEquation ID="IEq1"> <EquationSource Format="TEX">${\Delta G}_{T}^{^\circ }=42912+32.404T$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mmultiscripts> <mrow> <mi mathvariant="normal">Δ</mi> <mi>G</mi> </mrow> <mrow> <mi>T</mi> </mrow> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </mmultiscripts> <mo>=</mo> <mn>42912</mn> <mo>+</mo> <mn>32.404</mn> <mi>T</mi> </mrow> </math></EquationSource> </InlineEquation> J/mol and Henrian activity coefficient <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\text{ln}{\gamma }_{\text{N in Ni}(\text{l})}^{^\circ }=\frac{3641}{T}+1.545$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>ln</mtext> <mmultiscripts> <mi>γ</mi> <mrow> <mtext>N in Ni</mtext> <mo stretchy="false">(</mo> <mtext>l</mtext> <mo stretchy="false">)</mo> </mrow> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </mmultiscripts> <mo>=</mo> <mfrac> <mn>3641</mn> <mi>T</mi> </mfrac> <mo>+</mo> <mn>1.545</mn> </mrow> </math></EquationSource> </InlineEquation> for N2 dissolution in Ni(l) were derived, reconciling scattered literature data. This fundamental dataset provides a solid thermodynamic basis for elucidating nitrogen behavior in Ni-based alloys.

A Systematic Study on Nitrogen Solubility in Liquid Nickel: Extending Sieverts’ Law Validation Over Wide Temperature-Pressure Ranges

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发表日期：

2026年3月9日

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Zhimin You,
Zhijie Lai,
Yanan Yu,
Yi Wang,
Wenjing Wang,
Binhe Wu,
Wenkai Ma,
Jong-Jin Pak,
Zhouhua Jiang

摘要

A systematic experimental investigation on nitrogen solubility in Ni(l) was conducted over 0 to 20 atm N₂ and 1500 °C to 1750 °C using a precisely temperature-controlled (± 0.5 °C) induction furnace. Sieverts’ law is validated for nitrogen solubility in Ni(l) at pressures up to 20 atm, and highly self-consistent standard Gibbs energy ${\Delta G}_{T}^{^\circ }=42912+32.404T$ ${Δ G}_{T}^{^{\circ}} = 42912 + 32.404 T$ J/mol and Henrian activity coefficient $\text{ln}{\gamma }_{\text{N in Ni}(\text{l})}^{^\circ }=\frac{3641}{T}+1.545$ $ln γ_{N in Ni (l)}^{^{\circ}} = \frac{3641}{T} + 1.545$ for N₂ dissolution in Ni(l) were derived, reconciling scattered literature data. This fundamental dataset provides a solid thermodynamic basis for elucidating nitrogen behavior in Ni-based alloys.