Preparation method for ultrahigh-strength high-toughness aluminum alloy

Abstract

The invention discloses a preparation method for an ultrahigh-strength high-toughness aluminum alloy. The preparation method comprises the following steps: weighing raw materials according to component and content design; putting Al, an Al-50Cu intermediate alloy and an Al-Ni intermediate alloy into a medium-frequency induction furnace, heating until metal in a crucible is molten, adding Zr particles and a pure Mn sheet while heating up to a temperature of 720-740 DEG C, heating up to a temperature of 800-820 DEG C, adopting a graphite pressing spoon for pressing in pure Zn and pure Mg after power failure; adopting a refining agent and a modifier and a C2Cl6 degasifier to perform modifying and refining treatment; slagging-off and standing; pouring melt into spraying depositing equipment, switching on powder feeding equipment, feeding low-alloying aluminum alloy powder with content being 5%-30% into a spraying, depositing and atomizing cone to spray, deposit and form billets; and performing extrusion compacting treatment and thermal treatment. The preparation method is simple in process, keeps strength and toughness of the prepared aluminum alloy at relatively high level, is short in preparation process time, is reliable in process, greatly reduces the production cost, improves production efficiency, and is easy for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy materials, and relates to a method for preparing an ultrahigh-strength and high-toughness aluminum alloy. Background technique [0002] The 7000 series aluminum alloy is a kind of high-strength and high-toughness aluminum alloy material developed and developed internationally in the 1940s with the background of aviation materials. The traditionally used 7000 series aluminum alloy material is generally processed through ingot casting, cold and hot deformation processing, and heat treatment. And other processes to obtain the final various profile products, which have been widely used in the manufacture of various aircraft fuselages, wing beams, cabin panels and high-strength structural parts in rockets for a long time. Material. At present, dozens of 7000 series aluminum alloy products with different alloy composition standard grades have been developed in the world, and there are hundreds o...

AI Technical Summary

Problems solved by technology

During the large deformation process, the internal structure of the material will also undergo collaborative deformation, such as grain elongation, enhanced phase flow line arrangement, etc. This process will cause anisotropy of the formed part, which will affect subsequent applications

Moreover, improper deformation methods will also form crack defects inside, which will affect its performance.

At the same time, the blind pursuit of high strength will inevitably lead to low plasticity and toughness of the alloy. For example, the tensile strength of a typical spray-deposited ultra-high-strength aluminum alloy can reach more than 800MPa, but its fracture toughness is only 15MPa m 1 / 2 around, seriously affecting the application of the material

[0005] Therefore, it is necessary to develop a method for preparing ultra-high-strength and high-toughness aluminum alloys to meet the needs of aerospace materials. At present, the technology of using spray deposition technology to prepare ultra-high-strength and high-toughness aluminum alloys has not been reported.

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