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Heat working technological process for high strength deformed magnesium alloy

A technology of deformed magnesium alloy and process method, which is applied in the field of magnesium alloy processing, can solve the problems affecting the processing ability of the product, the decrease of alloy strength and plasticity, and the coarsening of precipitated phases, so as to achieve excellent plasticity, improved thermal deformation ability, Wrinkle-free and crack-free effect

Inactive Publication Date: 2009-07-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, the plasticity of these alloys is poor
In order to obtain sufficient deformability and deformation processing capacity, such high-strength magnesium alloys often need to be extruded and rolled at temperatures above 400 °C, but such high temperatures can easily cause grain growth and precipitated phase coarsening, thus Reduce the strength and plasticity of the alloy, affecting the performance of the product or subsequent processing capabilities

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  • Heat working technological process for high strength deformed magnesium alloy

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Embodiment Construction

[0012] In one embodiment of the present invention, the alloy system is ZK60, and its chemical composition is shown in Table 1.

[0013] Table 1 Chemical composition of ZK60 alloy (wt%)

[0014]

[0015] Magnesium alloy ingots cast by semi-continuous process were homogenized at 340°C for 14 hours and then cooled to room temperature with the furnace; then heated and kept at 410°C for 85 minutes; then hot extrusion was carried out immediately with an extrusion ratio of 25 and an extrusion speed of 4.6 m / min.

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Abstract

The invention relates to hot working process of a high-strength deformation magnesium alloy. The method comprises selecting appropriate thermal treatment temperature and time, controlling processes of dissolving of compound phases, exsolution, precipitation and the like, on the basis of stability of different compound phases and different characteristics of thermodynamics and kinetics in magnesium alloys, therefore effectively controlling the histological structure of the alloy for making that the magnesium alloy both have excellent plastic property and obtain high strength. According to the invention, a hot working system is formulated according to the character of magnesium alloy compounds and the system having a wide applicability is prone to realize industrialization scale production, is suitable for magnesium-zincium base aging strengthening type magnesium alloy and is especially suitable for ZK system high-strength deformation magnesium alloy with the zincium bigger than or equal to 6.0.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing, and in particular relates to a thermal processing method of high-strength deformed magnesium alloy. Background technique [0002] Magnesium has a close-packed hexagonal crystal structure. At room temperature, only the basal plane slips, and the plastic deformation ability is poor. When it is higher than 225°C, the facets slide and the plastic deformation ability is improved. As the hot working temperature increases, the flow stress decreases and the plasticity increases. Commercial high-strength wrought magnesium alloys usually refer to the ZK series, that is, magnesium-zinc-zirconium alloys, typical grades such as ZK60 and ZK61. The alloys in this series disperse and precipitate MgZn compound phases during the artificial aging process, thus having obvious aging strengthening effects. However, the plasticity of such alloys is poor. In order to obtain sufficient deformability ...

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Application Information

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IPC IPC(8): C22F1/06
Inventor 张静杨亮潘复生张海涛
Owner CHONGQING UNIV
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