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Strength and Cyclic Crack-Growth Resistance of Thermally Deformed Alloys of the Al-Mg-Sc System

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We study the microstructure, phase composition, strength and plasticity characteristics, and crack-growth resistance under cyclic loading of thermally deformed (by extrusion, pressing, and rolling) castings of Al-Mg-Sc alloys (of the 1570 and 1545 types) with different magnesium contents obtained as a result of magnetohydrodynamic stirring of melt. It is shown that the grain size of the alloy after rolling and the amount of grain-boundary precipitates of intermetallic compounds decrease as the magnesium content of the alloy becomes lower. The mechanical characteristics of both alloys ambiguously depend on the procedure and temperature of thermomechanical treatment. It is shown that the parameter of structural strength of the investigated alloys (complexly determined by the characteristics of strength and fatigue crack-growth resistance) is higher than for the available Al-Mg-Sc, Al-Mg, and Al-Cu-Mg alloys. At the same time, its lowest value was recorded for the alloy with fine grains.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, National Academy of Sciences of Ukraine, Lviv, Ukraine

    O. P. Ostash, R. V. Chepil & V. Ya. Podhurska

  2. “I. Sikorsky Kyiv Polytechnic Institute”, National Technical University of Ukraine, Kyiv, Ukraine

    V. A. Titov

  3. Physico-Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    S. L. Polyvoda & M. M. Voron

Authors
  1. O. P. Ostash
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  2. R. V. Chepil
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  3. V. A. Titov
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  4. S. L. Polyvoda
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  5. M. M. Voron
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  6. V. Ya. Podhurska
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Correspondence to O. P. Ostash.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 57, No. 3, pp. 118–125, May–June, 2021.

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Ostash, O.P., Chepil, R.V., Titov, V.A. et al. Strength and Cyclic Crack-Growth Resistance of Thermally Deformed Alloys of the Al-Mg-Sc System. Mater Sci 57, 413–421 (2021). https://doi.org/10.1007/s11003-021-00555-w

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  • DOI: https://doi.org/10.1007/s11003-021-00555-w

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