Investigation of Mechanical Properties and Salt Spray Corrosion Test Parameters Optimization for AA8079 with Reinforcement of TiN + ZrO2.

T Sathish,T Raja,T Arunkumar,Ibrahim M Alarifi,V Mohanavel,Asif Afzal,Ali Algahtani,Irfan Anjum Badruddin,Ahmad Rashedi

doi:10.3390/ma14185260

Abstract

This work mainly focuses on increasing the mechanical strength and improving the corrosion resistance of an aluminum alloy hybrid matrix. The composites are prepared by the stir casting procedure. For this work, aluminum alloy 8079 is considered as a base material and titanium nitride and zirconium dioxide are utilized as reinforcement particles. Mechanical tests, such as the ultimate tensile strength, wear, salt spray corrosion test and microhardness test, are conducted effectively in the fabricated AA8079/TiN + ZrO2 composites. L9 OA statistical analysis is executed to optimize the process parameters of the mechanical and corrosion tests. ANOVA analysis defines the contribution and influence of each parameter. In the tensile and wear test, parameters are chosen as % of reinforcement (3%, 6% and 9%), stirring speed (500, 550 and 600 rpm) and stirring time (20, 25 and 30 min). Similarly, in the salt spray test and microhardness test, the selected parameters are: percentage of reinforcement (3%, 6% and 9%), pH value (3, 6 and 9), and hang time (24, 48 and 72 h). The percentage of reinforcement highly influenced the wear and microhardness test, while the stirring time parameter extremely influenced the ultimate tensile strength. From the corrosion test, the hang time influences the corrosion rate. The SEM analysis highly reveals the bonding of each reinforcement particle to the base material.

Highlights

The stir casting process is a reliable process and it is used frequently for ferrous and nonferrous components
Aluminum alloy with the addition of titanium nitride and zirconium oxide hybrid composites were prepared through the stir casting methodology, and the composites were tested by the tensile test, wear test, corrosion test and microhardness test
From the ultimate tensile strength the maximum ultimate tensile strength was observed as 205.52 MPa from the sixth experimental runs

Summary

Introduction

The stir casting process is a reliable process and it is used frequently for ferrous and nonferrous components. The stir casting process provides the homogeny, durability and strength of the mixed composite after it forms the solid shape. The powder is mixed well in the base materials to make up a rigid solid structure after solidification. The stirring parameters, such as stirring speed, stirring time and stirring temperature, are highly involved in altering the strength of the hybrid composites [1]. The aluminum alloy 6061 hybrid MMCs (Metal matrix composites) with reinforcement of silicon carbide uses a banana and jute to increase the strength of the composites [2]. The authors conducted the tensile test, hardness test and percentage of elongation

Methods

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Discussion

Conclusion