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Effect of Deep Cryogenic Treatment on Microstructure and Properties of AE42 Mg Alloy

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The effect of deep cryogenic treatment (DCT) on microstructure and mechanical properties including corrosion behavior of the squeeze-cast AE42 alloy has been investigated. For comparison, the same has also been studied on the untreated alloy. Both the untreated and deep cryogenic-treated (DCTed) alloys comprised α-Mg and Al4RE phases. Volume fraction of the Al4RE phase in the AE42 alloy reduced gradually following DCT carried out from 4 to 16 h. Ductility and UTS increase significantly with a marginal increase in YS of all the DCTed alloys. The improvement was attributed to the dissolution of the brittle Al4RE phase following DCT. Among the alloys employed, the best tensile properties were obtained for the 16-h DCT alloy due to its lowest content of the brittle Al4RE phase. Creep resistance of the DCTed alloys was lower than that of the untreated alloy owing to the presence of less amount of thermally stable intermetallic Al4RE phase. Wear resistance of the alloy reduces following DCT due to reduced hardness of the DCTed alloys. The untreated alloy exhibits the best corrosion resistance, whereas poor corrosion resistance of the DCTed alloys is attributed to the reduced amount of Al4RE phase that fails to built a corrosion resistance barrier.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, 769008, India

    Pranav Bhale, H. Shastri & A. K. Mondal

  2. Department of Mechanical Engineering, National Institute of Technology, Rourkela, 769008, India

    M. Masanta

  3. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India

    S. Kumar

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  1. Pranav Bhale
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  2. H. Shastri
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Correspondence to A. K. Mondal.

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Bhale, P., Shastri, H., Mondal, A.K. et al. Effect of Deep Cryogenic Treatment on Microstructure and Properties of AE42 Mg Alloy. J. of Materi Eng and Perform 25, 3590–3598 (2016). https://doi.org/10.1007/s11665-016-2238-6

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  • DOI: https://doi.org/10.1007/s11665-016-2238-6

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