CRYOGENIC ALUMINUM ALLOY PROCESSING METHOD Russian patent published in 2024 - IPC C22F1/47 B21B3/00 B21C23/02 

FIELD: metallurgy of alloys.

SUBSTANCE: invention relates to processing of cryogenic aluminum alloys of Al-Mg-Mn-Sc-Zr system, intended for use as structural material in form of deformable semi-finished products in cryogenic equipment. Method includes melt overheating to temperature of 760–800 °C with holding for 0.5–1.0 h, casting of ingot by continuous casting into sliding crystallizer, annealing at temperature of 360–380 °C for 12 hours, machining the ingot, pressing the ingot at temperature of 380 °C, wherein a workpiece of rectangular cross-section is obtained, annealing for stress relief of the obtained workpiece at temperature of 340–350 °C for 40 minutes, cutting a workpiece of square section, deformation of the obtained square-section workpiece by equal-channel angular pressing at an angle of intersection of channels of 90° at temperature of 295–305 °C with the number of passes 12, which corresponds to true deformation 12 with back pressure equal to 40–50% of applied pressure, and workpiece rotation after each pass through 90° relative to axis, perpendicular to larger face of the workpiece and passing through the center of the workpiece, after which cold rolling is carried out with total degree of reduction of 80%.

EFFECT: obtaining a method of processing cryogenic aluminum alloys of the Al-Mg-Mn-Sc-Zr system with improved strength properties at cryogenic temperature without additional heat treatment.

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