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On the Role of Semi-Die Angle in Multi-Pass Cyclic Expansion Extrusion: Effects on Microstructure and Mechanical Properties of AA 6063

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Abstract

The influence of the semi-die angle (α = 45°, 30° and 22.5°employed in the present experiments) of the cyclic expansion extrusion (CEE) process on grain refinement in Al-alloy AA 6063 processed at 100°C at a pressing velocity of 0.5 mm.s− 1 and subjected to different number of passes is examined. The strain imparted on the specimen strongly depends on the die geometry. Grain refinement as well as increase in the ultimate tensile strength and micro-hardness after 10 CEE passes is the highest when the semi-die angle (α) is 22.5°. TEM images reveal the formation of fine grains after 10 CEE passes. Dislocation generation and cell formation directly depend on the strain imparted and the interactions between the dislocations and the Mg2Si precipitates. The tensile strength and hardness of the CEE processed specimens were compared as a function of the semi-die angle (α) and the results were compared with those of the unprocessed alloy also.

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Acknowledgements

The authors thank Prof. Indradev Samajdar, IIT Bombay, for permitting the use of the EBSD facility. The authors also are grateful to PSG College of Technology, Coimbatore, India for making available their TEM facility for this work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Thiruvalluvar College of Engineering and Technology (TCET), Vandavasi, 604505, India

    V. Babu

  2. Department of Mechanical Engineering, College of Engineering Guindy, Anna University, Chennai, 600025, India

    Balasivanandha Prabu Shanmugavel & K. A. Padmanabhan

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  1. V. Babu
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Correspondence to V. Babu.

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Babu, V., Shanmugavel, B.P. & Padmanabhan, K.A. On the Role of Semi-Die Angle in Multi-Pass Cyclic Expansion Extrusion: Effects on Microstructure and Mechanical Properties of AA 6063. Met. Mater. Int. 29, 3066–3077 (2023). https://doi.org/10.1007/s12540-023-01423-9

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