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Process for improving age hardening effect of high-zinc deformed magnesium alloy

A technology for deforming magnesium alloy and process method, applied in the field of magnesium alloy processing, can solve the problems of reducing supersaturation, over-burning of alloy, coarse size, etc., and achieve the effect of improving deformability

Active Publication Date: 2014-12-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since ZA series alloys contain more alloying elements (≥10wt%) than commercial Mg-Al series alloys, a large number of non-equilibrium eutectic structures often appear in the alloy during casting, and the size of these eutectic structures is coarse. The diffusion rate of alloying elements Zn and Al in the magnesium matrix is ​​very slow, and the conventional T6 treatment is difficult to effectively dissolve these compounds, thus reducing the supersaturation of Zn and Al elements in the magnesium matrix before aging and inhibiting the age hardening effect. As a result, the alloy can only obtain a limited increase in strength and hardness, and the potential advantage of the alloy's high strength and hardness has not been fully utilized.
In order to promote the dissolution of the non-equilibrium eutectic structure in the as-cast structure, currently only by prolonging the solution time or increasing the solution temperature, however, the extension of the solution time will lead to grain growth, and too high solution temperature is easy to Causes the alloy to overburn, these phenomena will deteriorate the mechanical properties of the alloy

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Examples

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Effect test

Embodiment 1

[0019] Example 1: A high-zinc-magnesium alloy ingot was prepared by semi-continuous casting (other casting methods are also applicable), the composition of which is Mg-7Zn-3Al-0.7%Er, and the ingot was homogenized at 325°C for 20h annealed and then cooled to room temperature. figure 1 is the metallographic microstructure of the Mg-7Zn-3Al-0.7%Er alloy before and after homogenization, determined by figure 1 It can be seen that there are a large number of non-equilibrium eutectic compounds in the as-cast structure ( figure 1 a), After homogenization annealing, some non-equilibrium eutectic compounds are dissolved, but there are still many undissolved compound phases in the alloy. Quantitative metallographic results show that the volume percentage of the homogenized compound is 4.7%. The homogenized ingot was face-milled, kept at 350°C for 120 minutes, and then hot-extruded on a horizontal extruder with an extrusion ratio of 25, and then air-cooled to room temperature after ext...

Embodiment 2

[0020] Example 2: A high-zinc-magnesium alloy ingot was prepared by a semi-continuous casting process, and its composition was Mg-10Zn-4Al-0.4%Y. The ingot was subjected to homogenization annealing at 320°C for 40 hours, and then cooled to room temperature with the furnace. The homogenized ingot was face-milled, kept at 340°C for 90 minutes, then hot-extruded on a horizontal extruder with an extrusion ratio of 16, and then air-cooled to room temperature after extrusion. The extruded deformed material is subjected to two-step gradual solution treatment. First, it is held at 315°C for 3 hours, then heated to 360°C at a heating rate of ~ 2K / min, and held at 0.5h, and then placed in warm water at 60°C. Water quenching. Compared with the conventional T6 solid solution treatment process, the compound quantity in the alloy is greatly reduced after the gradual solid solution treatment of the present invention. Finally, the quenched alloy was aged at 150°C for 35h. After the solid so...

Embodiment 3

[0021]Example 3: A high-zinc-magnesium alloy ingot was prepared by a semi-continuous casting process, and its composition was Mg-8Zn-3.5Al-0.4%Er. The ingot was subjected to homogenization annealing at 315°C for 50 hours, and then cooled to room temperature with the furnace . The homogenized ingot was face-milled, kept at 345°C for 60 minutes, then hot-extruded on a horizontal extruder with an extrusion ratio of 28, and then air-cooled to room temperature after extrusion. The extruded deformed material was subjected to two-step gradual solution treatment. First, it was kept at 320°C for 2h, then heated to 355°C at a heating rate of ~ 2K / min, and kept at 1h, and then watered in warm water at 50°C. Quenching. Compared with the conventional T6 solid solution treatment process, the compound quantity in the alloy is greatly reduced after the gradual solid solution treatment of the present invention. Finally, the quenched alloy was aged at 180°C for 20h. After the solid solution ...

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Abstract

The invention discloses a process for improving an age hardening effect of a high-zinc deformed magnesium alloy. The method comprises the following steps of: firstly, carrying out homogenization treatment onto an alloy ingot; then, crushing non-equilibrium compounds in the alloy by thermally processing; and finally, facilitating the compounds to dissolve as much as possible by adopting two-step gradient-type solid solution treatment. The process disclosed by the invention can be used for effectively facilitating the dissolving of non-equilibrium eutectic crystals in a high-zinc Mg-ZN-Al ternary alloy, improving the super-saturation degree of Zn and Al elements in the matrix and strengthening the age hardening effect of the high-zinc deformed magnesium alloy. Compared with the conventional T6 treatment, the treatment time is greatly shortened and the production efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing, in particular to a process method for improving the age hardening effect of high-zinc deformed magnesium alloys. Background technique [0002] As the lightest commercial metal engineering structural material at present, magnesium alloy is widely used in aerospace, transportation, 3C products and many other fields due to its excellent specific strength, excellent damping, shock absorption and noise reduction performance, good machining and surface decoration performance, etc. It has important application value and broad application prospect. At present, Mg-Al series (AZ series, AM series) alloys are the most widely used, but this type of alloy still has the problem of insufficient absolute strength. In recent years, studies have found that a type of τ-type Mg-Zn-Al alloy (ZA), which is formed by adding a large amount of Zn on the basis of Mg-Al alloys and strictly controlling t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/04
Inventor 张静杨亮左汝林
Owner CHONGQING UNIV
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