The effect of processing technique and temper conditions (as cast, artificial aging and deep cryogenic) on the corrosion behaviour of Al 7075/BN/Al2O3 hybrid nanocomposites and unreinforced alloy immersed in 3.5% NaCl was investigated. The hybrid nanocomposites were developed using a novel technique called molten salt processing. The corrosion behaviour of different materials samples was determined by conducting potentiodynamic polarization tests. Better corrosion resistance was observed with nanocomposites over unreinforced alloy. Among the different tempering conditions, the deep cryogenic treatment was found to enhance the corrosion resistance of nanocomposites. © 2019 IOP Publishing Ltd.

Kannan C

Department of Automotive Engineering

School of Mechanical Engineering

Vellore Campus

Ramanujam R

Department of Manufacturing Engineering

Ghosh R

Kumar V

Balan A.S.S.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Materials Research Express

In this research work, a comparative evaluation on the mechanical and microstructural characteristics of aluminium based single and hybrid reinforced nanocomposites was carried out. The manufacture of a single reinforced nanocomposite was conducted with the distribution of 2 wt.% nano alumina particles (avg. particle size 30–50 nm) in the molten aluminium alloy of grade AA 7075; while the hybrid reinforced nanocomposites were produced with of 4 wt.% silicon carbide (avg. particle size 5–10 µm) and 2 wt.%, 4 wt.% nano alumina particles. Three numbers of single reinforced nanocomposites were manufactured through stir casting with reinforcements preheated to different temperatures viz. 400 °C, 500 °C, and 600 °C. The stir cast procedure was extended to fabricate two hybrid reinforced nanocomposites with reinforcements preheated to 500 °C prior to their inclusion. A single reinforced nanocomposite was also developed by squeeze casting with a pressure of 101 MPa. Mechanical and physical properties such as density, hardness, ultimate tensile strength, and impact strength were evaluated on all the developed composites. The microstructural observation was carried out using optical and scanning electron microscopy. On comparison with base alloy, an improvement of 63.7% and 81.1% in brinell hardness was observed for single and hybrid reinforced nanocomposites respectively. About 16% higher ultimate tensile strength was noticed with the squeeze cast single reinforced nanocomposite over the stir cast. © 2017

Fulltext

Journal of Advanced Research

Comparative study on the mechanical and microstructural characterisation of AA 7075 nano and hybrid nanocomposites produced by stir and squeeze casting

International Journal of Mechanical Sciences

Microstructure and mechanical characterization of (B4C+ h-BN)/Al hybrid nanocomposites processed by ultrasound assisted casting

Journal of Alloys and Compounds

Effectiveness evaluation of molten salt processing and ultrasonic cavitation techniques during the production of aluminium based hybrid nanocomposites - An experimental investigation

Latin American Journal of Solids and Structures

Mechanical and Corrosion Behavior of Al7075 (Hybrid) Metal Matrix Composites by Two Step Stir Casting Process

Materials Chemistry and Physics

Microstructure, mechanical analysis and optimal selection of 7075 aluminum alloy based composite reinforced with alumina nanoparticles

Corrosion behaviour of novel molten salt processed aluminium nanocomposites under different treated conditions

Journal	Data powered by TypesetMaterials Research Express
Publisher	Data powered by TypesetIOP Publishing
ISSN	20531591
Open Access	No