Deformed magnesium alloy and casting method and deformation processing method thereof

A wrought magnesium alloy and deformation processing technology, applied in the field of wrought magnesium alloy and its melting and casting method and deformation processing

Active Publication Date: 2012-10-10
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Both of the above two patents obtain good strength and plasticity by adding Y, but the tensile mechanical properties of the alloy at room temperature still need to be improved, especially to further increase the strength on the basis of maintaining good plasticity

Method used

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  • Deformed magnesium alloy and casting method and deformation processing method thereof
  • Deformed magnesium alloy and casting method and deformation processing method thereof
  • Deformed magnesium alloy and casting method and deformation processing method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] The weight percent of the alloy composition is: Zn5.5%, Zr0.6% and Dy0.3%, and the rest is Mg.

[0023] The alloy is prepared according to the above composition, and the casting method is as follows: in N 2 and 0.2vol% SF 6 Under the protection of mixed gas, after the industrial pure Mg is melted, the temperature is raised to 730°C, and the industrial pure Zn, Mg-Zr, and Mg-Dy intermediate alloys are sequentially added to the melt every 5 minutes; the melt is stirred twice within 1 hour; and then added JDMJ-type refining agent is stirred and heated to 750-760°C, and left to stand for 30 minutes; finally, after the melt temperature is cooled to 715°C, it is poured into a forced-cooled cylindrical mold after removing slag, and is rapidly solidified into a billet. The deformation processing method is as follows: the above casting slab is homogenized at 400°C for 8 hours, adopts a forward extrusion method, the extrusion ratio is 40, the extrusion temperature is 320°C, and ...

Embodiment 2

[0026] The weight percent of the alloy composition is: Zn6.0%, Zr0.9% and Dy2.1%, and the rest is Mg.

[0027] The alloy is prepared according to the above composition, and the casting method is as follows: in N 2 and 0.2vol.%SF 6 Under the protection of mixed gas, after the industrial pure Mg is melted, the temperature is raised to 730°C, and the industrial pure Zn, Mg-Zr, and Mg-Dy intermediate alloys are sequentially added to the melt every 5 minutes; the melt is stirred twice within 1 hour; and then added JDMJ-type refining agent is stirred and heated to 750-760°C, and left to stand for 30 minutes; finally, after the melt temperature is cooled to 715°C, it is poured into a forced-cooled cylindrical mold after removing slag, and is rapidly solidified into a billet. The deformation processing method is as follows: the billet is homogenized at 400°C for 8 hours, using a forward extrusion method, with an extrusion ratio of 40, an extrusion temperature of 330°C, and an extrusi...

Embodiment 3

[0030] The weight percent of the alloy composition is: Zn5.0%, Zr0.3% and Dy4.3%, and the rest is Mg.

[0031] The alloy is prepared according to the above composition, and the casting method is as follows: in N 2 and 0.2vol.%SF 6 Under the protection of mixed gas, after the industrial pure Mg is melted, the temperature is raised to 730°C, and the industrial pure Zn, Mg-Zr, and Mg-Dy intermediate alloys are sequentially added to the melt every 5 minutes; the melt is stirred twice within 1 hour; and then added JDMJ-type refining agent is stirred and heated to 750-760°C, and left to stand for 30 minutes; finally, after the melt temperature is cooled to 715°C, it is poured into a forced-cooled cylindrical mold after removing slag, and is rapidly solidified into a billet. The deformation processing method is as follows: the casting billet is homogenized at 400°C for 8 hours, adopts the forward extrusion method, the extrusion ratio is 40, the extrusion temperature is 340°C, and th...

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Abstract

The invention relates to a deformed magnesium alloy and a casting method and a deformation processing method thereof. The deformed magnesium alloy comprises the following components in percentage by weight: 5.0 to 6.0 percent of Zn, 0.3 to 0.9 percent of Zr, 0.3 to 4.3 percent of Dy and the balance of Mg. The casting method for the magnesium alloy comprises the following steps of: raising the temperature to 730 DEG C under the protection of gas after Mg is melted, and adding Zn, a Mg-Zr intermediate alloy and a Mg-Dy intermediate alloy into a melt in sequence; adding a refining agent, stirring, raising the temperature to 750 to 760 DEG C, and standing for 30 minutes; and after the temperature of the melt is reduced to 715 DEG C, deslagging, and performing rapid solidification to obtain a casting blank. The deformation processing method for the magnesium alloy comprises the following steps of: performing homogenization treatment on the casting blank at the temperature of 400 DEG C, and performing forward extrusion under the conditions that the extrusion ratio is 40, extrusion temperature is 320 to 340 DEG C and extrusion speed is 1.5 to 2.5m/min. The defect of insufficient strength and plasticity of the conventional Mg-Zn-Zr series alloy is overcome, and the Mg-Zn-Zr-Dy alloy has a fine as-extruded structure and high room temperature and high temperature tensile mechanical properties.

Description

technical field [0001] The invention relates to a deformed magnesium alloy and its melting and casting method and deformation processing method, in particular to a deformed magnesium alloy added with rare earth element Dy and its melting and casting method and deformation processing method. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength and specific stiffness. It has been widely used in the fields of automobile, communication electronics and aerospace, and has become one of the important lightweight, high-strength and environmentally friendly structural materials. Wrought magnesium alloys exhibit better ductility and comprehensive properties. High-strength ZK60 wrought magnesium alloy is one of the most widely used commercial magnesium alloys at present. Its specific strength has exceeded that of 7075 aluminum alloy, but its comprehensive properties still cannot meet all application requirements, and its mechanical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22F1/06
Inventor 黄正华戚文军徐静周楠蔡畅郑开宏
Owner GUANGDONG INST OF NEW MATERIALS
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