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Microstructure Evolution and Constitutive Model of Spray-Formed 7055 Forging Aluminum Alloy.

Yu Deng¹, Huyou Zhao¹, Xiaolong Wang¹

¹College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.

Materials (Basel, Switzerland)

|September 13, 2025

Summary

This study details the thermal deformation of spray-formed 7055 aluminum alloy, developing a constitutive model and processing maps. It reveals dynamic recovery and recrystallization mechanisms influencing microstructure under varying conditions.

Keywords:

constitutive model hot deformation behavior microstructure spray-formed 7055 aluminum alloy

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Area of Science:

Materials Science
Metallurgy
Mechanical Engineering

Background:

Spray-formed 7055 aluminum alloy is crucial for aerospace applications.
Understanding its thermal deformation behavior is essential for optimizing manufacturing processes.
Existing research may not fully capture the interplay of strain rate and temperature on microstructure.

Purpose of the Study:

To investigate the thermal deformation behavior of spray-formed 7055 as-forged aluminum alloy.
To develop an accurate constitutive model for predicting flow stress.
To establish optimal processing parameters using processing maps and analyze microstructural evolution.

Main Methods:

Isothermal hot-press tests were conducted across a range of strain rates (0.01–10 s⁻¹) and temperatures (340–460 °C).
An Arrhenius constitutive model was developed using friction and temperature-corrected flow stress data.
Processing maps were constructed integrating instability criteria and power dissipation efficiency.

Main Results:

An Arrhenius model achieved high accuracy (R=0.9877, AARE=4.491%) with a deformation activation energy (Q) of 117.853 kJ/mol.
Optimal processing parameters were identified within the temperature range of 400–460 °C and strain rates of 0.08–0.37 s⁻¹.
Microstructural analysis showed simultaneous dynamic recovery (DRV) and dynamic recrystallization (DRX), with mechanisms like continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) dominating at different strain rates and temperatures.

Conclusions:

The developed constitutive model accurately predicts the alloy's behavior under thermal deformation.
Processing maps provide valuable guidance for industrial applications of 7055 aluminum alloy.
Strain rate and temperature significantly influence the dynamic softening mechanisms and microstructural evolution, with CDRX favored at higher strain rates and DDRX at lower rates.