RELATIONSHIP BETWEEN MICROSTRUCTURE, MECHANICAL PROPERTIES AND WEAR BEHAVIOR OF FRICTION STIR PROCESSED AZ31B ALLOY UNDER VARIOUS MEDIUM

R. Sankar, C. Rathinasuriyan, M. Puviyarasan and V. S. Senthil Kumar
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R. Sankar: Department of Mechanical Engineering, SRM University, Sonipat-131029, Haryana, India
C. Rathinasuriyan: ��Department of Mechanical Engineering, Vel Tech Rangarajan Dr. Sagunthala R&D, Institute of Science and Technology, Avadi, Chennai-62, Tamilnadu, India
M. Puviyarasan: ��Department of Mechanical Engineering, Panimalar Engineering College, Chennai-600123, Tamilnadu, India
V. S. Senthil Kumar: �Department of Mechanical Engineering, CEG, Anna University, Chennai-25, Tamilnadu, India

Surface Review and Letters (SRL), 2022, vol. 29, issue 06, 1-14

Abstract: Plates of AZ31B were friction stir processed in three different environments, such as liquid nitrogen, water and air with a rotational speed of 1200rpm and feed rate of 90mm/min. Microstructural studies were carried out using optical and electron microscopes, phase identification was performed using X-ray diffraction, and all specimens were tested for hardness, tensile and wear. An examination of wear debris morphology was carried out. Under cryogenic, water and air mediums, grain refinement was achieved at 1.89, 2.23 and 18.23μm, respectively. The specimen using cryogenic medium displayed greater tensile strength and elongation than the water medium. Dissolution of consistently refined grains and secondary Mg17 Al12 particles was observed after FSP underwater and cryogenic medium, resulting in a significant increase in microhardness. This surface hardening produced a significant benefit for the friction and wear behavior of the magnesium as measured by pin-on-disc configuration using a universal tribometer. With a cryogenic cooling medium, the friction coefficient is reduced by approximately 23% and the wear rate is reduced by 8% in comparison to AFSP.

Keywords: Magnesium alloy; friction stir processing under air; submerged friction stir processing; cryogenic friction stir processing; microstructure characterization; mechanical properties; wear rate (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X22500731

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