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STUDY THE MICROWAVE ENERGY EFFECTS ON MECHANICAL PROPERTIES AND ESTIMATED FATIGUE LIFE OF AA7075-T6

Authors: Ahmed Adnan AL-Qaisy --- Najmuldeen Yousif Mahmood --- Rasha Mohammed Hussein
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 6 Pages: 114-124
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

This study is concerned with the effect of microwave heat treatment of AA7075-T6 on the mechanical properties and fatigue life. Specimens were divided into four groups, firstly, specimens were subjected for 60 min. of microwave heat as a dry, secondly, specimens were subjected for 30 min. of microwave heat as a dry, thirdly, specimens were subjected for 60 min. of microwave heat as a wet, and fourthly, specimens were subjected for 30 min. of microwave heat as a wet condition. Then, it is compared with original alloy (AA7075-T6). The mechanical tests that used in this research are tensile, hardness, surface roughness and fatigue. It is found that hardness of dry specimens is higher than wet specimens, and hardness of dry condition for 60 min. has higher enhancement (15%) as compared with original alloy. Hardness is increased with increasing of time inside the microwave. However, tensile strength of wet conditions has higher than dry conditions; also, tensile strength is increased with decreasing of time inside microwave furnace. Ultimate and yield strength of wet condition for 30 min. have 55% and 99% respectively, enhancement as compared with AA7075-T6. Surface roughness parameter (Ra) of dry conditions has higher than wet conditions and the decreases as decreasing of time inside microwave furnace. Fatigue strength results showed that decreasing as compared with original alloy.

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