Preparation process of aluminum-magnesium-scandium alloy pipe material for aviation

Abstract

Disclosed is a preparation process of an aluminum-magnesium-scandium alloy pipe material for aviation. The preparation process includes the following process procedures that homogenization of an alloyingot is performed; the ingot is extruded into a round ingot blank; the round ingot blank is subjected to backward extrusion to form a primary pipe blank; the primary pipe blank is stretched; intermediate annealing is performed; stretching is performed; and annealing of a finished product is performed. By means of the preparation process, the homogenized ingot is extruded for cogging, the structure of the ingot is transformed into the deformed structure, the thermal deformability of the ingot blank in a hot extrusion process of the primary pipe blank is effectively improved, and then the primary pipe blank is prepared through backward perforation extrusion; then according to the characteristic of the recovery-recrystallization in an aluminum-magnesium-scandium alloy cold deformation-annealing process, a subsequent pipe blank drawing-annealing process and parameters are optimized, and the aluminum-magnesium-scandium alloy pipe material is prepared successfully; and the problems that the cracking is prone to occurring due to thermal deformation, the resistance of cold deformation of a pipe blank is large, and a pipe material is prone to fracturing in the drawing process during preparation of an existing aluminum-magnesium-scandium alloy pipe material are solved. Compared with an existing 5A06 alloy pipe material, the alloy pipe material of the invention has the advantages that the tensile strength and the yield strength are improved by 28% and 56% correspondingly, and the elongation is still maintained to be in a high level of 18.7%.

Description

technical field [0001] The invention relates to a preparation process of an aluminum-magnesium-scandium alloy pipe for aviation, and belongs to the technical field of aluminum alloy preparation. Background technique [0002] The existing 5A06 aluminum alloy has good corrosion resistance and good formability. Many pipes on the aircraft use this alloy. In order to reduce the weight of the aircraft itself and increase its payload, the application department hopes to develop a new type of aluminum alloy with higher strength. tubing. Aluminum-magnesium-scandium alloy is an improved alloy based on aluminum-magnesium alloys using Sc and Zr composite micro-alloying. Compared with aluminum-magnesium alloys, the tensile strength and yield strength of aluminum-magnesium-scandium alloys increase respectively according to the content of Sc. 25-35% and 40-65%, the ductility and toughness still remain at a relatively high level, but due to the increase in deformation resistance, the hot d...

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Problems solved by technology

[0003] In the prior art, aluminum alloy pipes are usually prepared by extrusion after ingot homogenization treatment. Due to the high deformation resistance of aluminum-magnesium-scandium alloys, its thermal deformation and cold deformation are relatively difficult. The existing aluminum alloy pipe production process is adopted. In the preparation of pipes, there are usually phenomena such as rough surface of the pipe blank and transverse cracks, etc., and qualified pipes cannot be prepared

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