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Microstructural and Hardness Changes during Isothermal Annealing of Nanostructured Al-11.6Fe-1.3V-2.3Si Alloy

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Abstract

Microstructural evolution and hardness change during isothermal annealing (300-550 °C, 30 min) of nanostructured Al-11.6Fe-1.3V-2.3Si alloy, prepared by mechanical alloying (MA) of elemental powders, were investigated using x-ray diffraction, transmission electron microscopy, and Vickers microhardness test. The results showed that the microstructure of the alloy after 60 h of MA consisted of a nanostructured Al-based solid solution with embedded Si. Annealing of the as-milled powders led to grain growth, internal strain release, and precipitation of the Al12(Fe,V)3Si compound above 400 °C. The grain growth of Al enhanced above the onset temperature for the precipitation of Al12(Fe,V)3Si phase. The grain size of Al after 30 min of annealing at 550 °C reached ~50 nm. Solute drag was responsible for retarding the grain growth below 400 °C, and above that temperature the grain growth was mainly limited by second-phase drag. The hardness (219 HV) of as-milled Al-11.6Fe-1.3V-2.3Si alloy decreased after annealing at 300 °C, but above that temperature the hardness increased with increasing the annealing temperature and reached ~250 HV after annealing at 550 °C for 30 min.

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  1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    H. Ashrafi, R. Emadi & M. H. Enayati

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  1. H. Ashrafi
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  2. R. Emadi
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  3. M. H. Enayati
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Ashrafi, H., Emadi, R. & Enayati, M.H. Microstructural and Hardness Changes during Isothermal Annealing of Nanostructured Al-11.6Fe-1.3V-2.3Si Alloy. J. of Materi Eng and Perform 24, 1026–1030 (2015). https://doi.org/10.1007/s11665-014-1354-4

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  • DOI: https://doi.org/10.1007/s11665-014-1354-4

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