High-rigidity and low-density novel aluminum-lithium alloy and preparing method thereof

Abstract

The invention provides a high-rigidity and low-density novel aluminum-lithium alloy and a preparing method thereof. The high-rigidity and low-density novel aluminum-lithium alloy comprises following metal raw materials including, by mass percent, 3%-6% of lithium, 1%-3.5% of copper, 0.5%-3% of magnesium, 0.1%-0.3% of zirconium and the balance aluminum. Through formula optimization and the preparing method, the tensile strength of the obtained aluminum-lithium alloy can exceed 580 MPa, the yield strength exceeds 610 MPa, ductility exceeds 6%, and density reaches 1.9 g / cm<3>. Chemical componentsare uniform, and casting technology component macrosegregation hardly exists; the content can be effectively controlled; flux coverage is not needed, and flux inclusion is avoided; Ar protection is adopted in the whole process, and oxide inclusion is avoided; casting cold shut and cracking defects are avoided, and the ingot blank heat stress is greatly reduced; spraying forming is uniform, rapidcooling is achieved, and an ingot blank structure is fine and uniform; water cooling is not needed in the whole production process, contact with water is avoided, the problem about casting leakage flow does not exist, and combustion, explosion and other risks are avoided.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy formula and preparation technology, and in particular relates to a high-rigidity, low-density novel aluminum-lithium alloy and a preparation method thereof. Background technique [0002] At present, national defense and military industry units are actively seeking new lightweight, high-strength and high-toughness materials in the selection of materials for aircraft fuselages, floor beams, wing longitudinal beams, rocket fuel storage tanks and spaceship resource cabins. According to statistics, for every 1% increase in lithium content in aluminum alloys, the density of the alloy decreases by 3%, while the modulus of elasticity increases by 6%. Replacing traditional aluminum alloys with aluminum-lithium alloys can reduce the weight of components by 10%-15%, and the stiffness Improve 15%-20%. The new aluminum-lithium alloy achieves a good weight reduction effect while ensuring various propert...

AI Technical Summary

Problems solved by technology

However, at present, there are few studies on aluminum-lithium alloys with high lithium (3%) at home and abroad, and the performance of aluminum-lithium alloys is mainly improved at the expense of high lithium content.