Optimization of T-6 cycle and Characterization of Si₃N₄ Reinforced High Strength Aluminum Metal Matrix Composites

• Autorzy: Kumar Ashish , Rana Ravindra Singh , Purohit Rajesh , Namdev Anurag

Identyfikatory

DOI

10.24425/amm.2023.142461

• Języki publikacji: EN

Abstrakty

EN

In this research, AA7068/Si₃N₄ composites were fabricated through stir casting with the attachment of ultrasonic treatment. The quenching medium and aging duration significantly influenced the hardness of Al alloy samples. Peak hardness was achieved after 12 h of artificial aging at the temperature of 140°C. The addition of nano Si₃N₄ significantly refined the microstructure of unreinforced AA7068. The dispersion of intermetallic compounds (MgZn₂) and grain boundary discontinuation were noticed after the T-6 heat treatment. Ultimate tensile strength, yield strength, and hardness were improved by 70.95%, 76.19%, and 44.33%, respectively, with the addition of 1.5 weight % Si₃N₄ compared to as-cast alloy due to the combined effect of heat treatment, hall-Petch, Orowan, thermal miss match, load-bearing strengthening mechanisms and uniform dispersion of reinforcement. A reduction in percentage elongation was noticed due to composites’ brittle nature by the effect of ceramic Si₃N₄ particles’ inclusion. The fracture surfaces reveal ductile failure for alloy and mixed-mode failure in the case of composites.

Słowa kluczowe

EN

stir casting; microstructure; mechanical properties; optimization; fractography

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2023
• Tom: Vol. 68, iss. 2
• Strony: 775--783
• Opis fizyczny: Bibliogr. 30 poz., fot., rys., tab., wykr.

Twórcy

autor

Kumar Ashish

• Maulana Azad National Institute of Technology, Department of Mechanical Engineering, Bhopa l, Madhya Pradesh, India

• https://orcid.org/0000-0002-9993-6292

autor

Rana Ravindra Singh

• Maulana Azad National Institute of Technology, Department of Mechanical Engineering, Bhopa l, Madhya Pradesh, India

autor

Purohit Rajesh

• Maulana Azad National Institute of Technology, Department of Mechanical Engineering, Bhopa l, Madhya Pradesh, India

autor

Namdev Anurag

• Maulana Azad National Institute of Technology, Department of Mechanical Engineering, Bhopa l, Madhya Pradesh, India

Bibliografia

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