Advancement in friction stir processing on magnesium alloys

Abstract

This review paper gathers information on the current trend of friction stir processing (FSP) that had been utilized to alter the surface metal that offers greater properties on magnesium alloys. However, inconsistent results due to changing parameters and different pin profile designs used previously was a challenge in this process. Hereby, discussing on FSP parameters, tool properties and impacts on magnesium (Mg) alloys to improvise the process. Rotational speed and traverse speed were set beforehand. Tool was plunged onto the material and moved in the traverse direction along certain length. The microstructure and microhardness properties of FSPed material were observed. AZ series of magnesium alloys mostly used in FSP. Most significant review was that the fixed rotational speed and feed rate made the grains became coarser. Finer grains were found when rotational speed was constant while feed rate increases. The higher the traverse speed, the higher the hardness of specimens. Setting up rotational speeds in between (900-1400) rpm could minimize defects effectively. Traverse speeds were set in between (25-40) mm/min to prevent pin holes and tunnel defects. Rotational speed affects the grain refinement level and the width of stirred zone while traverse speed influences the material flow rate.