Mg-Mn-Er wrought magnesium alloy and preparation method thereof

Abstract

The invention discloses an Mg-Mn-Er wrought magnesium alloy and a preparation method thereof. The Mg-Mn-Er wrought magnesium alloy comprises the following components in percentage by weight: 0.3-1.5% of Mn, 1-3% of Er and the balance of Mg and inevitable impurities. The preparation method comprises the following steps of: S1, preparing raw materials, namely weighing a pure magnesium ingot, a magnesium-manganese intermediate alloy and a magnesium-erbium intermediate alloy according to the component proportions of the Mg-Mn-Er wrought magnesium alloy; S2, performing smelting, specifically, firstly melting the pure magnesium ingot to obtain a magnesium melt, then adding the magnesium-manganese intermediate alloy and the magnesium-erbium intermediate alloy into the magnesium melt, and melting the magnesium-manganese intermediate alloy and the magnesium-erbium intermediate alloy, and cooling to obtain a magnesium alloy cast ingot; S3, performing solution treatment on the magnesium alloy cast ingot for 12-36 h under the condition that the temperature ranges from 400 DEG C to 560 DEG C, and performing water cooling on the magnesium alloy cast ingot to the room temperature; and S4, performing hot extrusion on the magnesium alloy cast ingot under the condition that the temperature ranges from 250 DEG C to 350 DEG C so as to obtain a magnesium alloy bar, namely the Mg-Mn-Er wrought magnesium alloy. The Mg-Mn-Er wrought magnesium alloy has high strength and plasticity. The preparation method is simple in technological process, low in equipment requirement and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy materials, in particular to a Mg-Mn-Er series deformed magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest structural material among practical metals, its specific gravity is 2 / 3 of that of aluminum and 1 / 4 of that of iron. In addition, magnesium alloys have excellent properties such as strong shock resistance, excellent wear resistance and thermal conductivity, and easy recycling of waste materials. They have been widely used in aerospace, automotive, electronics, and instrumentation industries. Magnesium alloys can be divided into cast magnesium alloys and deformed magnesium alloys. Compared with cast magnesium alloys, deformed magnesium alloys have been deformed to eliminate a series of casting defects such as macro segregation and pores, and have better mechanical properties. Therefore, in the structure On stressed components...

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Problems solved by technology

[0004] Large plastic deformation of magnesium alloys, such as equal-channel angular extrusion and high-pressure torsion, can produce magnesium alloys with good performance, but it requires high equipment. In addition, the texture of magnesium alloys produced by equal-channel angular extrusion is strong, and high-pressure torsion is difficult. Prepare bulk samples

In conventional extrusion, lowering the extrusion temperature can obtain finer grains, but the plastic deformation ability of the magnesium alloy is too low, and it is usually difficult to deform due to the effects of precipitation and other factors.

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