Aluminium alloy is one of the most widely used engineering materials due to their relatively lower specific weight and corrosion resistance compared to steel. Besides, they are also relatively easier to machine. Aluminium alloys have been found to provide the highest degree of machinability compared to other lightweight metal such as titanium and magnesium alloys. Among every other type of aluminium alloy, the 6061 aluminium alloy has been used for general purposes due to some interesting attributes it possesses when compared to others. The investigation on the effect of machining condition on the corrosion of 6061 aluminium alloy has shown that the machining via electrical discharged provides better resistance to pitting corrosion than the diamond and carbide turning machine. Drilling, turning and cutting may influence the mechanical characteristics of the workpiece by producing hole opening around the low residual stresses and a small layer of extremely stressed material on the newly created surface, making it to become more prone to fatigue, crack propagation and corrosion at the stressed surface. The machining surface integrity has great influences on the fatigue lifetime of material since micro-cracks always initiate at the surface. The traditional machining techniques compared to the non-traditional or non-conventional techniques are more susceptible to the induction of poor surface integrity due to direct contact between the tool and workpiece which are characterised by several damage defects such as micro-cracks, surface hardening, roughness and residual tensile. This paper therefore provides an overview of the classes of aluminium alloys, there applications and machining of the alloys with a keen focus on 6061 aluminium alloy and exposition of various machining technique with both their beneficial and non-beneficial effects on the workpiece, tool life and the environment.
Machining takes place when a part of undesirable material ranging from metals, polymer, and wood to ceramic or even composite is removed from a part to give a better shape and design. The parts that are machined are called workpiece and undesirable materials are called the chips. The machining process is in three forms which are the conventional (traditional) process, abrasive process and non-traditional processes. This review paper focused on the various forms of machining in stainless steel, based on the machine able family. Stainless found the way into various applications resulting in their wide usage which include equipment in the industries, equipment’s in beverage and food, automotive trim and cookware. This paper aims at opening more light on the importance of stainless steel during machining operations.
The purpose of safety designing is generally not on cost, but rather on saving life and nature, and consequently bargains just with specific risky system failure modes. High reliability levels are the consequence of good designing, scrupulousness and dependably never the aftereffect of re-dynamic failure management. Failure mode and effect analysis (FMEA) is a helpful technique analyzing engineering system reliability. The study focused on the use of FMEA technique to analyze the reliability of engineering equipment or components in selected areas such as: Wind Turbine component, Manufacturing Industries, Medical field and in evaluating the performances of Robots in different fields. The study showed the importance of FMEA as used widely in analyzing engineering equipment with regards to reliability.
Recently, the widespread of the applications of metallic materials in various spheres and fields or discipline in material science and engineering cannot be overemphasized. Alongside this great progression in the adoption of these material for use, the corrosion problems associated with these metals are also gradually becoming alarming which has birthed a call to action for immediate and sustainable efforts to salvage the problem. Several inhibitors have been developed in a bid to mitigate this corrosive ordeal facing a lot of industries, but inorganic inhibitors have some vital some shortcomings in form of poisonous substances which on the long run affects the surrounding. The pitfalls from non-organic inhibitors poised the drive of other researchers to develop a better, non-poisonous and organic inhibitive substances like Deoxyribonucleic Acid (DNA) that will mitigate corrosion without any negative residual effect on either the metallic materials or the environment. The DNA corrosion inhibitors have very good potential and economic owing to the source of extraction which is plant and animal waste which is in line with wealth generation prospect from waste product.
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