Abstract
Complex studies of the structure and strength properties of Al-Cr alloys prepared in the shape of ribbons with a thickness of l = (30–80) μm by rolling a melt jet in steel rolls as well as by reflow the surface of massive samples to a depth of h≈l with millisecond laser pulses, have been carried out. It is shown that anomalously supersaturated solid solutions based on Al (α) which retain the initial concentration of alloys, are recorded in rapid-quenched ribbons with a content of up to 7% Cr (*). In the zone of laser reflow the maximum saturation of the α-solution does not exceed ~3.2% Cr. Outside the areas of formation of strongly supersaturated solid solutions in the structure of ribbons and layers that are reflowed by a laser, dispersed mixtures of a depleted α-solution with initial crystals of Al7Cr equilibrium intermetallic, the sizes of which increase with increasing in chromium concentration, are formed. Structural changes observed in rapid-quenched ribbons and laser-reflowed layers are accompanied by significant strengthening of Al-Cr alloys. The maximum value of σf ≈ 400 MPa is recorded in ribbons with a content of 9.2% Cr that have the structure of a dispersed conglomerate of phases. This value is 3.5 times higher than the strength of the molten samples with corresponding composition.
In the analytical block of the work it was found that the lesser tendency of Al-Cr alloys to form strongly supersaturated solid solutions under conditions of fast laser quenching is due to the peculiarities of crystallization of the reflowed zone. In its lower part from the reflowing boundary matrix crystals of an α-solution with a Cr content close to equilibrium grow. In the upper horizons of the laser bath the formation of solid solutions of the initial composition is obstructed due to the enrichment of the melt with chromium as well as the slowing down of the cooling process due to the release of latent heat of transformation at the growth front of the matrix crystals of the α-solution.
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Lysenko, A.B., Kalinina, T.V., Gubarev, S.V., Zagorulko, I.V., Vishnevskaya, Y.V. (2021). Structure and Strength Properties of Al-Cr Alloys Obtained by Quenching from a Liquid State and Laser Surface Reflow. In: Karabegović, I. (eds) New Technologies, Development and Application IV. NT 2021. Lecture Notes in Networks and Systems, vol 233. Springer, Cham. https://doi.org/10.1007/978-3-030-75275-0_22
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