Abstract
Friction stir processing (FSP) is an important microstructural alteration process used recently in the engineering field. Grains alteration and hence the mechanical properties of the possessed zone are controlled by the temperature, heating and cooling rate. In this work, AZ31B magnesium samples were friction stir processed in three different cooling conditions like air, water and cryogenic (liquid nitrogen) cooling. 1000 rpm and 60 mm/min were kept constant as tool rotation speed and traverse speed respectively in all the three mediums. The consequence of these conditions on thermal fields, axial force, resulting grain structure and mechanical properties was studied. It is found that the cryogenic treated friction stir processed samples exhibit fine grain structures and hence offer better mechanical properties than the air and water cooled processed samples.
Highlights
Friction stir Processing (FSP) is developed and introduced to the global scenario in 1999 [1]
The present study investigates the hot-rolled AZ31B magnesium alloys was subjected to Friction stir processing (FSP) in air, water and cryogenic coolant respectively
Water and liquid nitrogen has a higher heat capacity than air which causes an increase in cooling rate and a decrease in peak temperature in water and cryogenic FSP compared to these in air FSP
Summary
Friction stir Processing (FSP) is developed and introduced to the global scenario in 1999 [1]. Mg alloys are known for excellent specific strength, excellent sound damping capabilities, useful cast-ability, good machinability, excellent formability, valuable electromagnetic interference shielding, and recyclability, having applications in aerospace, automobile and ship building industries. They have better corrosion resistant than aluminum alloys [6] [7]. Darras et al [8] have investigated the mechanical properties and microstructure behavior of FSP under water medium, and concluded that this is an effective technique which modifies the grain size and enhances the tensile properties of AZ91 magnesium alloy. Friction Stir processing of AZ31B Mg alloy during cryogenic cooled samples achieved finer and a better homogeneous grain size than the FSPed air Samples. Investigation of the effect of cooling conditions on the microstructure, mechanical properties and axial load was made
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