Single-phase supersaturated solid solution magnesium-aluminum alloy and preparation method thereof

Abstract

The invention discloses a preparation method of a single-phase supersaturated solid solution magnesium-aluminum alloy. The method is characterized by comprising steps as follows: (1) magnesium, aluminum and a few alloy elements are heated and then smelted; (2) metal melt smelted in the step (1) is subjected to stirring and refining treatment; (3) the metal melt refined in the step (2) is cast to form an alloy ingot; (4) the alloy ingot completed in the step (3) is subjected to equal channel angular pressing operation; (5) a magnesium-aluminum alloy completed in the step (4) is subjected to solid solution treatment, and heating and heat insulation operations are performed during solid solution treatment; (6) the magnesium-aluminum alloy completed in the step (5) is subjected to cooling quenching, and then the micro-structure of the single-phase supersaturated solid solution magnesium-aluminum alloy can be obtained. The method has the advantages that defects in the prior art can be overcome, and the method is reasonable and novel in design.

Description

technical field [0001] The invention relates to a single-phase supersaturated solid solution magnesium-aluminum alloy and a preparation method thereof, belonging to the field of metallurgy. Background technique [0002] Magnesium-aluminum alloys have excellent mechanical properties and processing properties, and are widely used in the fields of aviation, aerospace, automobiles and electronics. Common magnesium-aluminum alloys are AZ31 (Mg-3Al-1Zn), AM60 (Mg-6Al-0.5Mn), AZ91 (Mg-9Al-1Zn) and domestic AZ61M, AZ62M, AZ80M, etc., which are characterized by good It can carry out large plastic deformation, so it is often used as a deformed magnesium alloy. The strength and plasticity of magnesium-aluminum alloys mainly depend on the form of aluminum in the alloy, because the solubility of aluminum in magnesium has a high rate of change with temperature, and the saturation solubility at high temperatures is extremely high (437 ° C, aluminum in magnesium The saturated solubility c...

AI Technical Summary

Problems solved by technology

However, the currently used heat treatment process is difficult to completely dissolve aluminum for high-alumina-magnesium alloys to obtain single-phase supersaturated solid solution high-alumina-magnesium alloys. Generally speaking, this method has two shortcomings. One is that long-term heating causes coarse grains, The mechanical properties and processing properties of the material are reduced. Second, it is difficult to completely dissolve the second phase in the matrix even if it is homogenized for a long time, and it is difficult to obtain the structure of a single-phase supersaturated solid solution.