Effect of Heat Treatment and Hot Working on Vibrational and Mechanical Properties of Magnesium Alloy AZ91

Subject Areas : journal of New Materials

رضا Azarafza ¹ (استادیار، گروه مکانیک، مجتمع دانشگاهی مواد و فناورهای ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران)
A.H Rezaei ² (کارشناس ارشد، مهندسی متالورژی و مواد، دانشگاه صنعتی مالک اشتر تهران)
M.R Montajabiha ³ (department of Mechanical Engineering, Islamic azad university , sanandaj barnch)

Received: 2016-12-19 Accepted : 2018-05-08 Published : 2018-04-21

Keywords: Heat Treatment, Magnesium alloy, hot working, attenuation,

Abstract :

     Magnesium and its alloys due to their unique properties, much attention has been aerospace and automotive industries. Important properties of these alloys can be cited to relatively low density that about two-thirds aluminum and high strength to weight ratio and good vibration absorption. In this paper, effect of heat treatment and hot working on vibrational properties, Mechanical and microstructure of magnesium alloy AZ91was studied. Thus, some samples that were identical in shape and weight were made of magnesium alloy AZ91.Then Solution, Solution – aging, Extrusion Process and stress relieved also rolling process and then stress relieved applied. Mechanical properties and vibration of samples heat treated and hot working along with the cast samples are measured. The microstructure of the samples analyzed by optical microscope. The results are shown solution and aging heat treatment to deposit the second phase boundaries and with increasing influence of deposition to the border, Power locks on the border increases. As a result of this process is to increase the mechanical properties and reduce the vibrational properties. While the sample is rolled had the best frequency response and damping ratio. Increased mechanical properties of aging sample Reduces the damping ratio.

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