Warm deformation process for improving strength and damage resistance of erbium-containing aluminum-magnesium alloy

Abstract

The invention provides a warm deformation process for improving the strength and damage resistance of an erbium-containing aluminum-magnesium alloy and belongs to the technical field of the non-ferrous alloys. The warm deformation process comprises the steps of performing hot rolling on an erbium-containing aluminum-magnesium alloy plate which comprises the following components in percentage by weight: 5.9%-6.2% of Mg, 0.3-0.6% of Mn, 0.6%-0.9% of Zn, 0.1%-0.2% of Zr, 0.1%-0.2% of Er, less than or equal to 0.5% of inevitable impurities and the balance of Al, at a temperature of 410+ / -20 DEG C by a deformation amount of 90%, and cooling to room temperature, next, preserving heat for 1 hour at 230 DEG C and rolling at the temperature of heat preservation, wherein the amount of warm rolling deformation is 60%. The warm deformation process is capable of appropriately increasing the number of dislocations, improving the strength, and also regularizing dislocation tangle and homogenizing deformation, and therefore, the spreading speed of fatigue cracks of the material is reduced and an erbium-containing aluminum-magnesium alloy with high strength and high damage resistance is obtained.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, in particular to a warm deformation process for improving the strength and damage resistance of erbium-containing aluminum-magnesium alloys. technical background [0002] The literature survey results show that the microstructure can affect both the yield strength and the fatigue crack growth rate. The increase of dislocation density can increase the strength of the alloy, but at the same time it also increases the stress concentration, increases the rate of fatigue crack growth, and causes a decrease in damage resistance. The reduction of grain size increases the strength through fine-grain strengthening, but at the same time reduces the tortuosity of fatigue crack growth, increases the rate of fatigue crack growth, and results in a decrease in damage resistance. The improvement of strength and the improvement of damage resistance are always contradictory. [0003] Al-Mg series alloy...

AI Technical Summary

Problems solved by technology

Al-Mg series alloys, cold working deformation leads to a large increase in dislocation density, which improves the strength but reduces the damage resistance, and the hot working deformation increases the grain boundary at a larger angle, which improves the damage resistance, but the decrease in dislocation density causes Decrease in strength, neither cold rolling nor hot rolling can match the strength and damage resistance

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