Friction stir processing of the AZ91 magnesium alloy with SiC particles
Journal Title: Archives of Materials Science and Engineering - Year 2016, Vol 77, Issue 2
Abstract
Purpose: Purpose The main purpose of the research was friction modification by means ofmaterial stirring (FSP – Friction Stir Processing) of the surface layer of the AZ91 magnesiumalloy with SiC particles.Design/methodology/approach: For the introduction of SiC particles and the formationof the composite structure in the surface layer of the magnesium alloy, the original multichamber technology (MChS), developed as part of this study, was used. The scope ofresearch verifying the effectiveness of the friction modification included both macro- andmicroscopic evaluation of the structural changes triggered by the treatment.Findings: The research results showed that friction modification of the AZ91 magnesiumalloy leads to a strongly refined structure and intensively dispersed SiC ceramic particlesin the surface layer of the magnesium alloy, resulting in the formation of the compositestructure of the metal-ceramic type. In the stirred zone (SZ), a prevalence of equiaxed grainssized 2–15μm was observed, whereas the degree of refinement of structure depended onthe treatment parameters, especially on the rotation speed of the stir tool. In the thermomechanicallyaffected zone (TMAZ), deformed grains dominated, the location of whichcorresponded to the direction of the displacement of the plastified material during the FSPtreatment. SiC particles have been found both in the SZ and in the TMAZ.Practical implications: The obtained results prove that using the FSP technology tomodify the surface layer of magnesium alloys with SiC particles is an effective and promisingsolution with a high application potential, which allows for forming the material structure toa great extent.Originality/value: The structural research has shown that the Multi Chamber Systemtechnology enables a controlled and virtually lossless introduction of an additional phasein the course of the single-stage treatment, and minimizes the dislocation of the powderbeyond the working area of the working tool.
Authors and Affiliations
J. Iwaszko, K. Kudła
Keywords
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