Study on microstructure evolution and hot deformation behaviour of Cu–6.5Fe–0.3Mg alloy

ABSTRACT

The hot deformation behaviour and microstructure evolution of the Cu–6.5Fe–0.3Mg alloy were explored. The optimum hot working temperature of the alloy was 950°C and the strain rate was 10 s⁻¹. The alloy underwent dynamic recovery (DRV) and dynamic recrystallisation (DRX) behaviour during hot compression. The density of the Fe phase particles increased significantly, and they were all aligned along the vertical compression direction. The α-Fe phase transformed to γ-Fe phase at 950°C. A large amount of α-Fe and γ-Fe phases effectively inhibited the DRX behaviour of the Cu–6.5Fe–0.3Mg alloy and significantly improved its thermal stability. The research on the hot deformation behaviour of the Cu–6.5Fe–X alloys had a theoretical guiding role in determining its hot working process.

Highlights

• The optimal hot deformation process of Cu–6.5Fe–0.3Mg alloy was clarified.

• Constitutive equations and thermal working diagrams of the alloys are constructed

• Thermal deformation significantly increases Fe particle density, optimising its distribution.

• the transformation of α-Fe phase to γ-Fe phase during the hot compression at 950°C.

• The increasing in Fe phase significantly inhibits the dynamic recrystallization of the alloy.

KEYWORDS:

• Cu–6.5Fe–0.3Mg alloy
• dynamic recrystallisation
• α-Fe phase
• γ-Fe phase

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors are pleased to acknowledge the financial supportof this research by the National Key Research and Development Program of China [grant number 2016YFB0301400], Study on the regulation mechanism of alloy elements on the microstructure and properties of high-performance Cu-Fe alloys [grant number 205200100617], Funded Project: Key Science and Technology Project of Jiangxi Province (20181BCB19003), Study on the Controllable Preparation of Cu-Fe-Mg alloy with High-strength and High-conductivity Magnetic Shielding (ZLHanBaoJun-202008), National Natural Science Foundation of China [grant numbers 51561008, 51804138, 51761013]; National Natural Science Foundation of China: [grant numbers 51561008, 51804138, 51761013].