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Method for deep cooling extruded magnesium-zinc magnesium alloy

A technology for cryogenic treatment and magnesium alloys, applied in the field of cryogenic treatment of magnesium alloys, can solve the problems of difficulty in guaranteeing process quality, time-consuming and labor-intensive, etc., and achieve the effects of improved wear resistance, simple process method, and convenient operation.

Inactive Publication Date: 2013-09-04
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of process is time-consuming and laborious, and the quality of the process is difficult to guarantee.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The sample is an extruded Mg-1.5Zn-0.15Gd magnesium alloy rod. The preparation method of the sample is as follows: the raw materials are 98.35% commercially pure Mg, 1.5% commercially pure Zn and 0.15% commercially pure Gd in the atomic ratio. After the raw materials of the above ratio are made into ingots, the alloy is extruded into rods with a diameter of 30mm at a temperature of 673K. The extrusion ratio is 11:1.

[0015] Put the extruded Mg-1.5Zn-0.15Gd magnesium alloy at a low temperature of 77K for 24 hours and then take it out after cryogenic treatment, and let it rise naturally to room temperature. The cryogenic medium used is liquid nitrogen. The treated Mg-1.5Zn-0.15Gd magnesium alloy was tested on a ball-on-disk wearer. The friction pair is a GCr15 steel ball with a diameter of 10mm. The wear loads are 5N, 6N, 7N and 8N respectively, the sliding speed of the friction pair is 0.105m / s, and the wear time is uniformly 5min. Tests have shown that the wear re...

Embodiment 2

[0019] The sample is an extruded ZA84 magnesium alloy rod. The sample preparation method is as follows: the raw material is a commercial ZA84 magnesium alloy ingot. The alloy was extruded into rods with a diameter of 30mm at a temperature drop of 673K ​​from the ingot. The extrusion ratio was 11:1.

[0020] Place the extruded ZA84 magnesium alloy at a low temperature of 77K for 32 hours, take it out, and let it rise to room temperature naturally. The cryogenic medium used is liquid nitrogen. The treated ZA84 magnesium alloy was subjected to wear tests on a ball-on-disk wearer. The friction pair is a GCr15 steel ball with a diameter of 10mm. The wear loads are 5N, 6N, 7N and 8N respectively, the sliding speed of the friction pair is 0.105m / s, and the wear time is uniformly 5min. Tests have shown that the wear resistance of the ZA84 magnesium alloy after cryogenic treatment for 24 hours has been significantly improved, as shown in the specific performance.

[0021] 1. Sign...

Embodiment 3

[0024] The sample is an extruded Mg-6Zn-1Y magnesium alloy rod. The preparation method of the sample is as follows: the raw materials are 93% commercially pure Mg, 6% commercially pure Zn and 1% commercially pure Y in atomic ratio. The alloy was extruded into rods with a diameter of 30mm at a temperature drop of 673K ​​from the ingot. The extrusion ratio was 15:1.

[0025] Place the extruded Mg-6Zn-1Y magnesium alloy at a low temperature of 87K for 32 hours and then take it out, and let it rise to room temperature naturally. The cryogenic medium used is helium. The treated Mg-6Zn-1Y magnesium alloy was tested on a ball-on-disc wearer. The friction pair is a GCr15 steel ball with a diameter of 10mm. The wear loads are 5N, 6N, 7N and 8N respectively, the sliding speed of the friction pair is 0.105m / s, and the wear time is uniformly 5min. Tests have shown that the wear resistance of the Mg-6Zn-1Y (at. %) magnesium alloy after cryogenic treatment for 24 hours is significantly...

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Abstract

A method for deep cooling an extruded magnesium-zinc magnesium alloy is provided, and comprises the following steps of: putting the extruded magnesium-zinc magnesium alloy into low-temperature liquid nitrogen or low-temperature helium gas at the temperature of 43 K to 243 K for deep cooling, wherein the deep cooling time is longer than or equal to 2 h; and after deep cooling, taking out the magnesium alloy, and recovering naturally to room temperature. The magnesium-zinc magnesium alloy is an Mg-Zn-X ternary alloy, wherein X is aluminum, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium or lutetium. The method has the advantages of simple process, convenient operation and low production cost, has great improvement of abrasion resistance, and enables abrasion rate to be reduced by at least more than 30%; and the method is suitable for the industrializing-scale improvement of the abrasion resistance of the magnesium alloy.

Description

technical field [0001] The invention relates to a cryogenic treatment process for magnesium alloys. Background technique [0002] Magnesium alloy is currently the lightest engineering structural material. In addition to its light specific gravity, it also has the advantages of low density, high specific strength and specific stiffness, easy molding, and good thermal conductivity. Therefore, magnesium alloys are widely used in automobiles, electronics, 3C and other related industries. However, the wear resistance of magnesium alloys is poor, which greatly limits the use of magnesium alloys as key components. For commercial magnesium alloys, such as AZ91D (Mg-9Al-1Zn), the dry coefficient of friction is usually around 0.4. [0003] At present, research on improving the wear resistance of magnesium alloys mainly focuses on special treatment on its surface, such as coating TiN or other anti-wear coatings composed of dense oxides. However, this kind of process is time-consumin...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 刘勇曾效舒邵爽金斌付东明
Owner NANCHANG UNIV
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