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Role of temperature and strain rate on evolution of microstructure, flow stress and constitutive equation in hot deformation of AZ80A Mg alloy

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Abstract

In this work, the forgeability behaviour of AZ80A magnesium (Mg) alloys was studied using thermo-mechanical simulator and mechanical press. Tests were carried out over a temperature range of 573 K-673 K at a strain rate of 0.005–1/s. In most cases, the microstructure shows dynamic recrystallization (DRX) with a single peak of flow stress followed by a gradual decrease. Materials constant was obtained using a constitutive equation. Processing map for AZ80A Mg alloy was established and it reveals that at temperature 623 K, the materials show better forgeability. Considering this another set of wrought AZ80A Mg alloy was hot forged at a temperature of 623 K using a 250-ton mechanical press. Microstructural analysis of as-received, hot compressed and hot forged samples was done. As-received wrought alloy depicts the structure primarily consisting of α-Mg & Mg17Al12 intermetallics at the grain boundary. Hot compressed and forged sample shows a distinct necklace-like structure composed of fine recrystallized grains. During plastic deformation, lamellar and lath intermetallics are broken and scattered along the intergranular region in hot forging. Intermetallics act as Zener pinning effect and restrict the grain boundary mobility thus finer recrystallized grain is observed. Electron Beam Scattered Diffraction (EBSD) analysis of samples confirms that the forged sample shows maximum volume fraction of HAGB with random and weak texture along < 0001 > basal plane.

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Acknowledgements

The authors of this research article would like to thank ARAI management and the materials team for their support in this research work.

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  1. Technology Group, ARAI, HTC Chakan, Pune, 410501, India

    P. K. Ajeet Babu, U. S. Karle, Yogesh Ambhore & Chandan Choudhary

  2. Mechanical Engineering Department, Maharashtra Institute of Technology, Aurangabad, India

    Chandan Choudhary

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  1. P. K. Ajeet Babu
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Babu, P.K.A., Karle, U.S., Ambhore, Y. et al. Role of temperature and strain rate on evolution of microstructure, flow stress and constitutive equation in hot deformation of AZ80A Mg alloy. Int J Mater Form 15, 76 (2022). https://doi.org/10.1007/s12289-022-01722-3

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