Evaluation of Creep Behavior of Al-Al3V and Al-(Al3V-Al2O3) Nanostructured Composites Produced by Mechanical Alloying and Hot Extrusion

Subject Areas :

Sayedeh Zahra Anvari ¹ , ّF. Karimzadeh ² , M. H. Enayati ³

1 - Department of Mechanical and Metallurgical Engineering, Payame Noor University (PNU), Tehran, Iran
2 - Department of Materials Engineering, Isfahan University of Technology, Iran
3 - Department of Materials Engineering, Isfahan University of Technology, Iran

Received: 2024-07-24 Accepted : 2024-09-19 Published : 2025-07-08

Keywords: Aluminum Matrix Composites, Mechanical Alloying, Hot Extrusion, Creep,

Abstract :

In recent years, the creep and thermal stability of aluminum matrix composites have attracted considerable attention due to their potential for high-temperature applications. The addition of reinforcing particles generally enhances the creep resistance of the aluminum matrix. In this study, the creep behavior of aluminum matrix nanocomposites reinforced with Al3V and Al3V-Al2O3 particles fabricated using mechanical alloying, cold pressing, and hot extrusion was investigated. The morphology and microstructure of the prepared samples were examined using scanning electron microscopy (SEM). The creep behavior of the samples was evaluated in the temperature range of 250-350 °C. The results showed that the true stress exponent of the composites, which was highly dependent on temperature and stress, was close to 5. The creep mechanism at the studied temperatures was found to be dislocation climb. The apparent activation energies for Al-10wt.%(Al3V-Al2O3) and Al-10wt.%Al3V were 178 and 161 kJ/mol, respectively, which were higher than the self-diffusion activation energy in aluminum. The creep behavior of the composites was accompanied by a stress threshold that decreased with increasing temperature.

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