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Deformation Mechanisms and Formability Window for As-Cast Mg-6Al-2Ca-1Sn-0.3Sr Alloy (MRI 230D)

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Abstract

The hot deformation characteristics of MRI 230D alloy have been evaluated in the temperature range 260-500 °C and strain rate range 0.0003-10 s−1, on the basis of processing map. The processing map exhibited two domains in the ranges: (1) 300-370 °C and 0.0003-0.001 s−1 and (2) 370-480 °C and 0.0003-0.1 s−1. Dynamic recrystallization occurs in the both domains with basal slip dominating in the first domain along with climb as recovery process and second-order pyramidal slip dominating in the second with the recovery by cross-slip. In Domains (1) and (2), the apparent activation energy values estimated using the kinetic rate equation are 143 and 206 kJ/mole, respectively, the first one being close to that for lattice self-diffusion confirming climb. It is recommended that the alloy is best processed at 450 °C and strain rates less than 0.1 s−1, where non-basal slip and cross-slip occur extensively to impart excellent workability. The alloy exhibits flow instability in the form of adiabatic shear band formation and flow localization at lower temperatures and higher strain rates. Forging of a cup-shaped component was performed under various conditions, and the results validated the predictions of the processing map on the workability domains as well as the instability regimes.

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Acknowledgments

The authors would like to thank Mr. C.H. Yuen, Department of Mechanical and Biomedical Engineering, City University of Hong Kong, for his help during the experimental work.

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Author notes

  1. Kalidass Suresh

    Present address: Department of Physics, Bharathiar University, Coimbatore, 641046, India

Authors and Affiliations

  1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, SAR

    Kalidass Suresh, Kamineni Pitcheswara Rao & Dharmendra Chalasani

  2. processingmaps.com, No. 2/B, Vinayaka Nagar, Hebbal, Bengaluru, 560024, India

    Prasad Yellapregada Venkata Rama Krishna

  3. Magnesium Innovation Centre, Helmholtz Zentrum Geesthacht, Max-Planck-Strasse 1, 21502, Geesthacht, Germany

    Norbert Hort & Hajo Dieringa

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  1. Kalidass Suresh
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Correspondence to Kamineni Pitcheswara Rao.

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Kalidass Suresh and Prasad Yellapregada Venkata Rama Krishna: formerly with City University of Hong Kong.

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Suresh, K., Pitcheswara Rao, K., Chalasani, D. et al. Deformation Mechanisms and Formability Window for As-Cast Mg-6Al-2Ca-1Sn-0.3Sr Alloy (MRI 230D). J. of Materi Eng and Perform 27, 1440–1449 (2018). https://doi.org/10.1007/s11665-018-3219-8

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  • DOI: https://doi.org/10.1007/s11665-018-3219-8

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