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Impact of tool rotational speed on the microstructural transitions and tensile properties of the dissimilar AZ80A-Mg – AA6061-Al joints fabricated by friction stir welding

  • P. J. Lokesh Kumar

    is currently pursuing his Ph.D. Degree in Mechanical Engineering, Anna University, India. He completed his M.Tech in CAD/CAM in 2014. He has a total of 8.5 years of teaching experience. He is currently serving as Assistant Professor, Mechanical Engineering Department, R.M.K. Engineering College, India.

         , P. Sevvel

    obtained his PhD in Mechanical Engineering in 2016 and M.Tech Degree in Industrial Engineering in 2005. He has 17 years of experience. He is working as a Professor, in Mechanical Engineering Department in S.A. Engineering College. He has published 40 research papers in various SCI and Scopus indexed journals.

         and T. G. Loganathan
Published/Copyright: April 21, 2023
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Practical Metallography
From the journal Practical Metallography Volume 60 Issue 5

Abstract

Distinct AZ80A-Mg alloy with AA6061-Al alloy plates were joined using friction stir welding and investigation regarding the weld features of the fabricated joints, related to microstructural attributes and mechanical properties was carried out by employing distinctive tool rotational speeds (1600, 1400, 1200, 1000 and 800 rpm). Tool possessing cylindrical pin with tapered profile was employed at constant traverse speed of 30 mm/min and was inserted towards AA6061 alloy plate at 0.5 mm offset distance. Experimental observations revealed that employment of tool rotational speed of 1200 rpm have generated ideal amounts of frictional heat, which have softened the ingredients of both the parent metals and have contributed for the transition of the grains into dynamically recrystallized, finely refined structures being distributed evenly in nugget zone. Moreover, this joint exhibited a tensile strength of 224 MPa (nearly 77.78 % of the tensile strength of AZ80A and 72.26 % of AA6061 alloy). Presence of river like patterns, rifts, tear crinkles at the middle portions of fractured surfaces, announced the brittle category of fracture of the flaw free joint and exhibited fracture at the horizon of the thermomechanically influenced zone and the nugget zone on retreatment side, where the warped structures have fused together.

Kurzfassung

Platten aus einer AZ80A-Mg- und einer AA6061-Al-Legierung wurden mittels Rührreibschweißen (Friction Stir Welding, FSW) gefügt. Die bei unterschiedlichen Werkzeugdrehzahlen (1600, 1400, 1200, 1000 und 800 1/min) erzielten Gefügemerkmale und mechanischen Eigenschaften der Verbindungen wurden untersucht. Das Werkzeug mit einem zylindrischen Stift mit konischem Profil wurde mit einer konstanten Verfahrgeschwindigkeit von 30 mm/min eingesetzt und mit einem Versatz von 0,5 mm in die Platte aus der Legierung AA6061 eingeführt. Bei den bei 1200 1/min hergestellten Verbindungen entwickelte sich eine optimale Menge an Reibungswärme, bei der die Bestandteile beider Grundwerkstoffe erweicht wurden und die zur Umwandlung der Körner zu dynamisch rekristallisierten, einachsigen Strukturen beigetragen hat, die gleichmäßig über den gesamten Bereich der Schweißlinse verteilt sind. Die Verbindung hatte eine Zugfestigkeit von 224 MPa, nahezu 77,78 % der Zugfestigkeit von AZ80A- und 72,26 % der Zugfestigkeit der AA6061-Legierung. Das Vorhandensein flussartiger Muster, Spaltungen und Rissverwerfungen in den mittleren Bereichen der Bruchflächen weisen auf ein sprödes Bruchverhalten der fehlerfreien Verbindung hin und wies einen Bruch am Horizont der thermomechanisch beeinflussten Zone und der Nuggetzone auf der Rückzugsseite auf, wo die verzogenen Strukturen miteinander verschmolzen sind.

Keywords: Tool rotational speed; AZ80A-Mg alloy; AA6061-Al alloy; Friction Stir Welding; Nugget zone; Tensile strength
Schlagwörter: Werkzeugdrehzahl; AZ80A-Mg-Legierung; AA6061-Al-Legierung; Rührreibschweißen; Bereich der Schweißlinse; Zugfestigkeit

About the authors

P. J. Lokesh Kumar

is currently pursuing his Ph.D. Degree in Mechanical Engineering, Anna University, India. He completed his M.Tech in CAD/CAM in 2014. He has a total of 8.5 years of teaching experience. He is currently serving as Assistant Professor, Mechanical Engineering Department, R.M.K. Engineering College, India.

P. Sevvel

obtained his PhD in Mechanical Engineering in 2016 and M.Tech Degree in Industrial Engineering in 2005. He has 17 years of experience. He is working as a Professor, in Mechanical Engineering Department in S.A. Engineering College. He has published 40 research papers in various SCI and Scopus indexed journals.

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Received: 2022-09-29
Accepted: 2023-02-21
Published Online: 2023-04-21
Published in Print: 2023-04-30

© 2023 Walter de Gruyter GmbH, Berlin/Boston, Germany

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  5. Impact of tool rotational speed on the microstructural transitions and tensile properties of the dissimilar AZ80A-Mg – AA6061-Al joints fabricated by friction stir welding
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https://doi.org/10.1515/pm-2022-1029
Keywords for this article
Tool rotational speed; AZ80A-Mg alloy; AA6061-Al alloy; Friction Stir Welding; Nugget zone; Tensile strength

Articles in the same Issue

  1. Content
  2. Editorial
  3. Editorial
  4. Garment buttons from a Hallstatt period tumulus
  5. Impact of tool rotational speed on the microstructural transitions and tensile properties of the dissimilar AZ80A-Mg – AA6061-Al joints fabricated by friction stir welding
  6. Failure Analysis
  7. Liquation Cracking in Row 3 Twin Turbine Vane Segment Caused by Malfunctioning Plasma Coating Gun
  8. Picture of the Month
  9. Picture of the Month
  10. Kommentar
  11. For THEY do not know what THEY are doing
  12. News
  13. Neuer BAM Report 2022/23: Transformation gemeinsam gestalten
  14. Meeting Dairy
  15. Meeting Diary
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