Abstract
Microwave heating is caused by the ability of the materials to absorb microwave energy and convert it to heat. The aim of this study is to know the difference that will occur when heat treating the high strength aluminum alloys AA7075-T73 in a microwave furnace within different mediums (dry and acidic solution) at different times (30 and 60) minutes, on mechanical properties and fatigue life. The experimental results of microwave furnace heat energy showed that there were variations in the mechanical properties (ultimate stress, yielding stress, fatigue strength, fatigue life and hardness) with the variation in mediums and duration times when compared with samples without treatment. The ultimate stress, yielding stress and fatigue strength decreased for all states compared with standard values. With reference to fatigue life, the results showed that the increment in fatigue life occurred for test states of dry 60 minutes in a microwave furnace, which were only 25%. Moreover, the increment in hardness range was reached for test state of acid in 60 minutes which was about 7.3%, and 5 % for dry in 30 minutes and only 3%.
Highlights
Microwaves had been part of the electromagnetic spectrum with frequencies ranging from 300 MHz to 300 GHz and consistent wavelengths between 1 m and 1 mm respectively [1,2]
Microwave Furnace Heat Energy (MFHE) had been effectively and efficiently using for processing of ceramics and composite materials which are else hard to process through conventional processes [1,6], its fine microstructures and improved mechanical properties are observed with reduced processing duration time [6]
In this work it has been found that a certain microwaves furnace duration time could made major effects on one or more of the mechanical properties including fatigue life, ultimate stresses and yielding stress for the alloys used
Summary
Microwaves had been part of the electromagnetic spectrum with frequencies ranging from 300 MHz to 300 GHz and consistent wavelengths between 1 m and 1 mm respectively [1,2]. Heat generated from within the body by the absorption of Microwave Furnace Heat Energy (MFHE) directly by the body and does not need substantial heating of the environment. Microwave furnace heat energy processing’s are a green manufacturing process, significantly fast and tends to be highly economical. When a material absorbs MFHE, heat can be generated inside the material and heating was instantaneous generated with the introduction of power [1, 2]. Another advantage of microwave furnace heating was that it could accelerated reaction rates and reduces reaction temperatures by reducing activation energy [2].
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