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Mohan Raj Athimulam, Jinu Paul, Srinu Gangolu, and S. M. Jagadeesh Babu, Development of constitutive models and hot-working processing map for Al–12Ce–0.4Sc alloys, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3049-7
Mohan Raj Athimulam, Jinu Paul, Srinu Gangolu, and S. M. Jagadeesh Babu, Development of constitutive models and hot-working processing map for Al–12Ce–0.4Sc alloys, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-3049-7
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Al–12Ce–0.4Sc合金本构模型和热加工工艺图的开发

摘要: 采用等温热压缩试验研究了Al–12Ce–0.4Sc合金在30–450°C/0.001–1 s–1范围内的热变形行为。结果表明,流动曲线表现出典型的动态恢复(DRV)和轻微的流动软化行为。此外,在400–450°C/0.01–0.1 s–1范围内,由于动态应变时效(DSA)现象,流动曲线重叠。利用热变形实验数据建立了两种不同的本构模型:(i)应变补偿Arrhenius模型(Method I)和(ii)logistic回归模型(Method II)。平均应力指数(n)为14.25 kJ·mol–1,表观活化能(Q)为209.58 kJ·mol–1。热加工工艺图表明,最佳工艺条件为400°C/1 s–1,最大功耗为22%。利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和电子背散射衍射(EBSD)表征技术对加工图所示的稳定域和不稳定域进行了关联。不稳定区主要与先共晶Al11Ce3金属间化合物断裂和α-Al与先共晶Al11Ce3之间的界面裂纹有关。

 

Development of constitutive models and hot-working processing map for Al–12Ce–0.4Sc alloys

Abstract: The current study investigates the hot deformation behavior of Al–12Ce–0.4Sc alloy with an isothermal hot compression test at 300–450°C/0.001–1 s−1. Results show that the flow curves exhibit typical dynamic recovery (DRV) and slight flow-softening behavior. Additionally, the flow curves overlap owing to the dynamic strain aging (DSA) phenomenon at 400–450°C/0.01–0.1 s−1. Two different constitutive models were developed using the experimental data for hot deformation: (i) strain-compensated Arrhenius model (Method I) and (ii) logistic regression model (Method II). The average stress exponent (n) and apparent activation energy (Q) are 14.25 and 209.58 kJ·mol–1, respectively. The hot-working processing map shows that the optimal processing condition is 400°C/1 s−1, and the maximum power dissipation efficiency is 22%. Stable and unstable domains indicated by the processing map were correlated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD) characterization techniques. The unstable domains are primarily associated with pro-eutectic Al11Ce3 intermetallic fracture and interfacial cracks between α-Al and pro-eutectic Al11Ce3.

 

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