Microstructural Characterization and Mechanical Performance of AZ91 Magnesium Alloy Processed by Friction Stir Processing Using Novel Tool Designs
Source abstract
Abstract
Moderate strength and poor ductility of AZ91 Mg alloy are some of the primary concerns that impede its engineering application. In the present research work, an attempt is made to microstructurally engineer the material through friction stir processing (FSP) using new tool designs. Two new stepped-pin designs are proposed in this work—In the first design, the pin is of square steps where the larger square is followed by a smaller square from the shoulder with 0° inclination angle (S tool), and in the second design, the smaller square is inclined at 45° with respect to the first square making it appear like a diamond on a square from the top view (D tool). A constant processing speed of 100 mm/minute with a varied rotational speed of 800, 1000 and 1200 rpm was employed for the analysis. FSP with the proposed tool designs resulted in significant grain refinement due to intense frictional heat generation and severe plastic deformation. Multi-pass with 100% overlap has shown further refinement in the grain structure. Maximum grain refinement (75%) is observed after 3 passes of FSP using the S tool. On the other hand, the D tool is found to yield maximum strength gain along with improved ductility after multi-pass FSP. Fragmentation and dissolution of the β-Mg17Al12 phase and dynamic recrystallization of an α-Mg matrix are prominent reasons for significantly enhancing the material`s performance. Detailed analysis of the mechanism for microstructural refinement and mechanical performance with fractographic analysis is presented in detail.
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Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Advanced Welding Techniques Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (59)
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