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Investigation of the hot deformation behavior of Cu–9Ni–6Sn–0.6Cr alloy through isothermal compression: dynamic microstructure evolution and constitutive equation.

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Title: Investigation of the hot deformation behavior of Cu–9Ni–6Sn–0.6Cr alloy through isothermal compression: dynamic microstructure evolution and constitutive equation.
Authors: You, Yuanqi1 (AUTHOR), Liu, Liyuan1,2 (AUTHOR), Yi, Gang3 (AUTHOR), Xu, Zunyan1,2 (AUTHOR), Fu, Li1,2 (AUTHOR), Lu, Qiong1,2 (AUTHOR), Yi, Jianhong1,2 (AUTHOR), Li, Caiju1,2 (AUTHOR) lcj@kust.edu.cn
Source: Journal of Materials Science. Dec2025, Vol. 60 Issue 47, p24784-24801. 18p.
Subjects: Isothermal compression, Microstructure, Thermal strain, Strains & stresses (Mechanics), Copper-nickel alloys, Strain rate, Hot working
Abstract: This study investigated the hot deformation behavior of the Cu–9Ni–6Sn–0.6Cr alloy under different deformation conditions through isothermal hot compression experiments. The alloy was tested under four different strain rates (1 s⁻1, 0.1 s⁻1, 0.01 s⁻1, and 0.001 s⁻1) and four deformation temperatures (750 °C, 800 °C, 850 °C, and 900 °C). The microstructural evolution of the alloy was analyzed, and its constitutive model and hot processing map were developed based on the peak stress. The results show that the alloy exhibits a hot deformation activation energy of 227.754 kJ/mol. The material demonstrates a strain hardening index of 8.0408, with a strong correlation (R2 = 0.96065) observed between empirical measurements and theoretical predictions. The constructed hot processing map reveals that the alloy exhibits optimal formability under specific thermomechanical conditions, particularly within the 830–885 °C temperature range and at strain rates of 0.001–0.005 s⁻1. [ABSTRACT FROM AUTHOR]
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Abstract:This study investigated the hot deformation behavior of the Cu–9Ni–6Sn–0.6Cr alloy under different deformation conditions through isothermal hot compression experiments. The alloy was tested under four different strain rates (1 s⁻1, 0.1 s⁻1, 0.01 s⁻1, and 0.001 s⁻1) and four deformation temperatures (750 °C, 800 °C, 850 °C, and 900 °C). The microstructural evolution of the alloy was analyzed, and its constitutive model and hot processing map were developed based on the peak stress. The results show that the alloy exhibits a hot deformation activation energy of 227.754 kJ/mol. The material demonstrates a strain hardening index of 8.0408, with a strong correlation (R2 = 0.96065) observed between empirical measurements and theoretical predictions. The constructed hot processing map reveals that the alloy exhibits optimal formability under specific thermomechanical conditions, particularly within the 830–885 °C temperature range and at strain rates of 0.001–0.005 s⁻1. [ABSTRACT FROM AUTHOR]
ISSN:00222461
DOI:10.1007/s10853-025-11825-2