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Microstructures and impact toughness behavior of Al 5083 alloy processed by cryorolling and afterwards annealing

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Abstract

The influence of rolling at liquid nitrogen temperature and annealing on the microstructure and mechanical properties of Al 5083 alloy was studied in this paper. Cryorolled samples of Al 5083 show significant improvements in strength and hardness. The ultimate tensile strength increases up to 340 MPa and 390 MPa for the 30% and 50% cryorolled samples, respectively. The cryorolled samples, with 30% and 50% reduction, were subjected to Charpy impact testing at various temperatures from −190°C to 100°C. It is observed that increasing the percentage of reduction of samples during cryorolling has significant effect on decreasing impact toughness at all temperatures by increasing yield strength and decreasing ductility. Annealing of samples after cryorolling shows remarkable increment in impact toughness through recovery and recrystallization. The average grain size of the 50% cryorolled sample (14 μm) after annealing at 350°C for 1 h is found to be finer than that of the 30% cryorolled sample (25 μm). The scanning electron microscopy (SEM) analysis of fractured surfaces shows a large-size dimpled morphology, resembling the ductile fracture mechanism in the starting material and fibrous structure with very fine dimples in cryorolled samples corresponding to the brittle fracture mechanism.

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Authors and Affiliations

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

    Dharmendra Singh, P. Nageswara Rao & R. Jayaganthan

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  1. Dharmendra Singh
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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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Singh, D., Rao, P.N. & Jayaganthan, R. Microstructures and impact toughness behavior of Al 5083 alloy processed by cryorolling and afterwards annealing. Int J Miner Metall Mater 20, 759–769 (2013). https://doi.org/10.1007/s12613-013-0794-4

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  • DOI: https://doi.org/10.1007/s12613-013-0794-4

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