High-strength aluminum alloy material for fastener and preparation method of material

Abstract

The invention relates to a high-strength aluminum alloy material for a fastener and a preparation method of the material. The high-strength aluminum alloy material for the fastener is prepared from, by weight, 0.3%-0.5% of iron, 0.2%-1.0% of silicon, 0.4%-1.2% of copper, 0.1%-0.6% of scandium, 0.3%-1.1% of manganese, 0.01%-0.1% of lithium, 0.1%-0.5% of zirconium, 0.5%-1.3% of magnesium, 0.01%-0.1%of cerium, 0.01%-0.1% of yttrium, 0.05%-0.25% of chromium, 0.002%-0.02% of nickel, 0.1%-0.5% of zinc, 0.01%-0.06% of boron, 0.01%-0.05% of titanium, 0.01%-0.05% of vanadium and the balance aluminum;the ratio of the weight percentages of magnesium and silicon is not smaller than 1.042, the ratio of the weight percentages of iron and silicon is not smaller than 0.32, the sum of the weight percentages of scandium and zirconium is smaller than or equal to 1.2%, the sum of the weight percentages of lithium, cerium, yttrium and zinc is smaller than or equal to 0.52%, and the sum of the weight percentages of chromium, titanium and vanadium is smaller than or equal to 0.3%. Compared with the prior art, according to the high-strength aluminum alloy material for the fastener, the high specific strength, the high shear strength, the excellent plasticity and toughness and the corrosion resistance are achieved, and the safe reliability can be significantly improved while the weight of the fastener is greatly lowered.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a material for a fastener and a preparation method thereof, in particular to a high-strength aluminum alloy material for a fastener and a preparation method thereof. Background technique [0002] Fasteners are mechanical parts used to fasten two or more parts (or components) so that they are fastened and connected as a whole. They are widely used in energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, Hydraulic industry and so on. Especially with the continuous upgrading of key industries such as automobiles, new energy, aerospace, ships, rail transit, IT, electronic appliances, and construction, the requirements for lightweight and integration continue to increase, and new requirements have been put forward for the optimization and upgrading of fasteners. requirements. [0003] The performance of fastener materials largely determines the performance...

AI Technical Summary

Problems solved by technology

[0005] There are the following disadvantages in the manufacture of the above two methods: 1. The performance is not uniform, the residual charge in the furnace cannot be completely removed, and the chemical composition of each furnace is inconsistent, resulting in fluctuations in the performance of the rod material; 2. The coil weight is small, and the coil weight is only 30kg, the length of the rod is short, and welding is required to increase the length; 3. High cost, high energy consumption, small production capacity, and low thermal efficiency of a small furnace; 4. Large grains, because the production speed is slow, and the aluminum alloy melt stays in the furnace If the time is long, the grains tend to be coarse; 5. The labor intensity is high, and the up and down rolling of the lead rod after it is rolled, the welding of the rod, the stacking, and the heat treatment require manual work; 6. Only the rod below Φ9.5mm can be produced. When the material size is larger than Φ9.5mm, it cannot be rolled