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Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof

The technology of a magnesium alloy plate and its manufacturing method is applied in the field of low-cost magnesium alloy and its manufacture, which can solve problems such as difficulties in the application of rare earth magnesium alloy plates, and achieve the effects of no precious alloy elements, wide application of the process, and low production cost

Active Publication Date: 2013-08-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although rare earth elements are effective in weakening the texture of magnesium plates, due to factors such as cost, it is generally believed that the application of rare earth magnesium alloy plates in automobiles is very difficult

Method used

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  • Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof
  • Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof
  • Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0054] The chemical composition of the Mg-Ca-Zn-Zr series magnesium alloy sheet is shown in Table 1. The manufacturing method is:

[0055] The magnesium alloy billet (microstructure such as figure 1 shown) is heated to 500° C. for solution treatment, the holding time is 0.5 min / mm, and the Mg-Ca-Zn-Zr series magnesium alloy of this embodiment is obtained after rolling. During hot rolling, the roll surface is preheated to 150°C, the rolling start temperature is 450°C, the final rolling temperature is 350°C, and the single pass reduction rate is 20-30%; during warm rolling, the roll surface is preheated to 150°C , Magnesium alloy plate on-line heat supplement, rolling temperature is 220 ℃, single pass reduction rate is 20-40%; when cold rolling, the cold rolling reduction is 10%, and the final plate thickness is 0.4mm.

[0056] The magnesium alloy billet microstructure of embodiment 1 is as follows figure 1 As shown, its structure is equiaxed crystal, and the average grain si...

Embodiment 2

[0058] Embodiment 2: (comparative example 1)

Embodiment 3

[0063] The chemical composition of the Mg-Ca-Zn-Zr series magnesium alloy sheet is shown in Table 1. The manufacturing method is:

[0064] Heat the magnesium alloy cast slab that meets the composition ratio shown in Table 1 to a temperature of 500°C for solution treatment, and the holding time is 0.5min / mm; during hot rolling, the surface of the roll is preheated to 150°C, and the rolling start temperature is 450°C , the final rolling temperature is 350°C, and the single-pass reduction rate is 20-30%; during warm rolling, the roll surface is preheated to 150°C, and the magnesium alloy plate is reheated online, and the rolling temperature is 220°C, and the single-pass reduction The rate is 20-40%; during cold rolling, the cold rolling reduction is 10%, and the final plate thickness is 0.4mm; annealing at 375°C for 17 minutes is enough.

[0065] The microstructure of the Mg-Ca-Zn-Zr series magnesium alloy plate of embodiment 3 is as follows Figure 4 As shown, the grain size d...

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Abstract

The invention discloses a Mg-Ca-Zn-Zr magnesium alloy sheet which comprises the following chemical components in percentage by weight: 0.5-1.0% of Ca, 0.4-1.0% of Zn, 0.5-1.0% of Zr and the balance of Mg and unavoidable impurities, wherein the average grain size of the magnesium alloy sheet is less than or equal to 10 microns, the texture strength of the base surface is less than or equal to 5, and after annealing at 250-400 DEG C, the texture structure of the base surface is less than or equal to 3; the room-temperature ultimate draw ratio is higher than AZ31; the grain size is obviously less than the average grain size of the AZ31B sheet manufactured under the same conditions; and the sheet texture is obviously weakened. According to the magnesium alloy sheet disclosed by the invention, the magnesium alloy has simple composition without precious alloy elements, the technology is widely applicable, the production cost is low, and the magnesium alloy sheet can be used as a plate of components such as an automobile door inner plate, an engine cover inner plate, a trunk lid inner plate, an interior plate, a rail transit vehicle body, a 3C product shell and the like.

Description

technical field [0001] The invention relates to a low-cost magnesium alloy and its manufacturing method, especially a magnesium alloy thin plate with fine grain, weak texture and good formability and its manufacturing method. The average grain size of the obtained magnesium alloy thin plate is ≤10 μm, basically The surface texture strength is ≤5, and the base surface texture strength is ≤3 after annealing at 250-400°C; the formability is higher than that of AZ31. Background technique [0002] Magnesium crystal structure is hexagonal close-packed, and magnesium alloy sheets with strong texture exhibit mechanical property anisotropy and low formability. The fine-grained structure and discrete weak texture are the fundamental ways to improve the deformation properties and reduce the deformation anisotropy of magnesium plates under the conditions of medium and low temperature and fast strain rate. At the same time, this microstructure feature can improve the surface quality of f...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/04C22F1/06
CPCB22D21/007B22D23/00C22C23/00C22C23/04C22F1/06
Inventor 梁高飞张永杰杨旗王刚
Owner BAOSHAN IRON & STEEL CO LTD
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