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Development of Ultrafine-Grained Al–Mg–Si Alloy Through SPD Processing

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Abstract

In the present investigation, ultrafine-grained Al alloy was produced from its bulk alloy by cryoforging followed by cryorolling. The bulk Al–Mg–Si alloy, with initial grain size 400 μm, was subjected to solid solution treatment (ST) followed by water quenching at room temperature. The ST treated alloy was subjected to aging at 100 °C for 4 and 8 h prior to cryoforging. The cryoforged alloy was subjected to cryorolling up to 2.4 true strain for producing long sheets. Finally, the deformed alloy was subjected to low temperature aging at 120 °C to improve the tensile properties of the alloys. Microstructure and mechanical properties were evaluated through Vickers hardness testing, tensile testing, and electron back scattered diffraction. The results have shown that combined cryoforging + cryorolling followed by aging led to remarkable improvement in strength (UTS-452 MPa) and ductility (8%). The average grain size of the alloy was found to be 240 nm, with increased fraction of high angle grain boundaries. Low temperature differential scanning calorimetry was used to study thermal behavior of bulk and severely deformed alloy.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Maruff Hussain, P. Nageswara Rao & R. Jayaganthan

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  1. Maruff Hussain
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  2. P. Nageswara Rao
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  3. R. Jayaganthan
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Correspondence to R. Jayaganthan.

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Hussain, M., Nageswara Rao, P. & Jayaganthan, R. Development of Ultrafine-Grained Al–Mg–Si Alloy Through SPD Processing. Metallogr. Microstruct. Anal. 4, 219–228 (2015). https://doi.org/10.1007/s13632-015-0205-5

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