Rapid age hardening multi-element microalloy weak texture magnesium alloy and preparation method thereof

Abstract

The invention relates to the field of metal material magnesium alloys, in particular to a rapid age hardening multi-element microalloy weak texture magnesium alloy and a preparation method thereof. The alloy comprises the following components of 0.5 wt.%-2.0 wt.% of Zn, 0.1 wt.%-1.0 wt.% of Ca, 0 wt.%-1 wt.% of Sn, 0.05 wt.%-1 wt.% of manganese, and the balance commercial pure Mg and inevitable impurities, wherein the content of the impurities is less than 0.02%. The preparation method of the alloy comprises the steps of smelting, hot extrusion, multi-pass controlled rolling, recrystallization treatment, low-temperature aging and the like, wherein the low-temperature aging comprises low-temperature aging after pre-deformation stretching and low-temperature aging after cold rolling. The magnesium alloy subjected to recrystallization treatment is subjected to pre-deformation stretching and low-temperature aging treatment, the average size of alloy grains is 2-7 micrometers, in addition, the obtained magnesium alloy has a good age hardening effect, and it can be seen from an EBSD diagram that the alloy shows weak texture characteristics distributed in the TD direction, and the electrode density is 4.0; and in addition, the magnesium alloy has good mechanical properties, the yield strength of the alloy is larger than or equal to 300 MPa, and the ductility is larger than or equal to 15%.

Description

technical field [0001] The invention relates to the field of magnesium alloys as metal materials, in particular to rapid aging hardening multi-element trace alloy weak texture magnesium alloys and a preparation method thereof. Background technique [0002] As the lightest metal material for engineering structures, magnesium alloy has many excellent properties, such as high specific strength, high electrical and thermal conductivity, high damping and shock absorption, high electrostatic shielding, and good regeneration and reuse. It is favored in the selection of materials in the fields of aviation, aerospace, automobile and communication. Especially in terms of light weight, it has significant advantages that are difficult to replace. However, the commonly used magnesium alloys have low yield strength and poor plastic deformation ability, which limit their application in many occasions. [0003] Alloying is an important means to improve the strength of magnesium alloys. Th...

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Problems solved by technology

However, the introduction of excessive elements is likely to cause severe segregation during the casting solidification process, which requires high temperature and long-term heat treatment to alleviate it; at the same time, the addition of high alloying elements will easily lead to complex subsequent processing procedures and narrow processing window, which not only increases the preparation cost of the alloy, but also extremely The earth consumes energy, which is not conducive to sustainable development

For low-alloy content magnesium alloys, although the processing process is generally easier for high-alloy content magnesium alloys, the yield strength is low (<200MPa), which is far from meeting industrial needs.

[0004] Generally, aging heat treatment can further improve the strength of the alloy. However, the commonly used Mg-Al-Zn (AZ) series commercial magnesium alloys have weak low-temperature aging ability, and the peak aging generally takes dozens or even hundreds of hours; for the AZ series with low alloy content alloy, due to the large solid solubility of Al and Zn in the Mg matrix (at 200 ° C, the content of Al or Zn in the magnesium matrix can reach 2wt.%), there is almost no age hardening response

At the same time, deformed magnesium alloys generally exhibit strong texture characteristics, dislocation slip is not easy to open during the subsequent deformation process, and the plastic deformation ability is poor. Therefore, it is urgent to develop new low-alloy alloys with weak texture and strong artificial aging at low temperature or natural aging at room temperature. Content magnesium alloy

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