Homogenization treatment and subsequent processing method suitable for magnesium alloy ingots

Abstract

The invention discloses a homogenization treatment and subsequent processing method suitable for magnesium alloy ingots. The method comprises the following steps: (1) analyzing components of a magnesium alloy and number of low melting point phases; (2) performing the following steps according to the number of low melting point phases: preheating at a temperature which is 10-20 DEG C lower than an initial melting temperature of the low melting point phase change, performing deformation comprising one or a combination of optional two in forging, extruding and rolling on the alloy, and performing long-term homogenization on the deformed alloy; (3) performing subsequent alloy treatment, comprising the following sub-steps: performing direct ageing, continuously deforming and performing ageing, raising the temperature to 10-20 DEG C below the initial melting temperature of the next low melting point phase change, deforming, homogenizing, repeating until the low melting point phases are completely eliminated, and directly deforming and ageing without cooling after the homogenization is finished finally.

Description

technical field [0001] The invention relates to a method suitable for homogenization treatment and subsequent processing of magnesium alloys, which belongs to the category of industrial magnesium alloys. Background technique [0002] Due to its high specific strength, specific stiffness, and electromagnetic shielding properties, magnesium alloys are increasingly used in aerospace and other related fields. Aging strengthening, as one of the most important strengthening methods for magnesium alloys, is currently a research hotspot and difficulty both at home and abroad. As a common smelting and casting magnesium alloy, there are often a large number of undecomposed eutectic structures, which form relatively serious specific gravity segregation, especially For magnesium alloys with high alloy element content, this limits and reduces the subsequent aging strengthening effect of the alloy. Therefore, in order to improve the precipitation strengthening efficiency of the alloy, it ...

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Problems solved by technology

There are many ways to control the grain size of the alloy. For example, Zr element is often added to the rare earth magnesium alloy. Because it has a crystal structure and lattice constant similar to Mg, it can be used as a heterogeneous core to refine the grain size of the magnesium alloy. It is considered the most It is an effective refiner for refining the structure of magnesium alloys. In addition, it can also add alkaline earth elements and rare earth elements to refine the grains of magnesium alloys. However, these methods of adding alloy elements from outside have the following disadvantages: First, the way of adding elements Improper, prone to segregation or burning loss, lower yield, affecting the subsequent deformation of the alloy; second, the addition of precious elements increases the cost of the alloy

In addition, during the solidification process of the alloy, it is currently widely used to add an external field to achieve the purpose of refining the alloy structure, such as ultrasonic field, electromagnetic field, pulse field, etc., using the relevant principle of action to promote the breaking of large grains. However, these methods have the following disadvantages: first, the cost of equipment is relatively high, and the maturity of the process applied in magnesium alloy is not large; second, the range of action is very limited and it is easy to have the possibility of unevenness The range is limited by the power of the device