Metallurgical Engineering

Metallurgical Engineering

Formation of nickel aluminide coatings via post heat treatment of nickel plated AA2024 aluminum alloy

Document Type : Research Paper

Authors
Arash Khiabani 1
Zahrasadat Seyedraoufi 2
Mahmoud Heydarzadeh Sohi 3
1 Master Student, Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Alborz, Iran.
2 Assistant Professor, Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Alborz, Iran.
3 Professor, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
10.22076/me.2021.123716.1285
Abstract
In this research, nickel was electrodeposited on AA2024 aluminum using direct current. The coated specimens were then heat-treated at different temperatures of 450, 500, and 550°C for 30, 60, 90 and 120 minutes under argon shielding gas. The treated specimens were characterized by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction analysis (XRD). The presence of Al3Ni2 and Al3Ni intermetallic compounds were noticed at 450°C after 120 minutes and 500 and 550°C after 60 minutes. Microstructural studies also demonstrated that heat treatment at 550°C for 90 and 120 minutes leads to cracks at the coating/substrate interface. The maximum hardness reached 1000 Vickers after heat treating at 500°C for 120 minutes.
Keywords
2024 aluminum alloy
nickel plating
intermetallic compounds
hardness
 
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  • Receive Date 29 March 2020
  • Revise Date 31 May 2021
  • Accept Date 02 June 2021