Method for refinement of rare earth-rich phase of rare earth-magnesium alloy

A technology of rare earth-rich phases and rare earth master alloys, which is applied in the field of rare earth-rich phases in rare earth magnesium alloys, can solve the problems of reducing the strengthening effect of rare earth elements on magnesium alloys, coarseness, etc., and achieve cost improvement, refinement of rare earth phase size, and improved The effect of rheological shaping technology

Active Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

However, the rare earth-rich compound phase of the magnesium alloy that is generally directly added to the magnesium alloy for smelting and casting is generally coarse and irregular in shape, and the rare-earth-rich phase is mostly distributed at the grain boundary, which seriously reduces the concentration of rare earth elements. Strengthening effect on magnesium alloy

Method used

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  • Method for refinement of rare earth-rich phase of rare earth-magnesium alloy
  • Method for refinement of rare earth-rich phase of rare earth-magnesium alloy
  • Method for refinement of rare earth-rich phase of rare earth-magnesium alloy

Examples

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Effect test

example 1

[0036] Mg-6Zn-3RE-1.4Y rare earth magnesium alloy was prepared by using pure Zn (99.9%, mass fraction, the same below), pure Mg (99.9%), Mg-RE master alloy, Mg-Y master alloy, etc. as raw materials. The melting and refining process is as follows: all tools in contact with the alloy melt are painted in advance, and tools, raw materials, and sampling water-quenched quartz tubes are all preheated at 200°C for about 1 hour. Turn on the resistance furnace, add magnesium ingots when the crucible is preheated to about 150°C, and feed N when the temperature reaches 300°C 2 +SF 6 Protective gas, adjust the temperature to 700°C, add pure metal Zn, Mg-RE master alloy, and Mg-Y master alloy in sequence after the magnesium ingot is completely melted, adjust the temperature to 750°C, feed high-purity Ar gas for refining for 10 minutes, and degas scum, and then remove the scum. Use the temperature control device to keep the temperature of the alloy liquid at about 690-700°C. Take an appro...

example 2

[0039] The Mg-4Al-2RE rare earth magnesium alloy (the content of each alloy component is in mass percentage, the same below) is treated by ultrasonic vibration, and formed in a gravity metal mold. The melting and refining process is as follows: all tools in contact with the alloy melt are painted in advance, and tools, raw materials, and sampling water-quenched quartz tubes are all preheated at 200°C for more than half an hour. Turn on the resistance furnace, add magnesium ingots when the crucible is preheated to about 150°C, and feed N when the temperature reaches 300°C 2 +SF 6 Protective gas, adjust the temperature to 700°C, after the magnesium ingot is completely melted, add pure metal Al, Mg-RE intermediate alloy, and then adjust the temperature to 750°C, feed high-purity Ar gas for refining for 15 minutes, degas and remove slag, and then remove scum. The temperature of the alloy liquid is kept at about 700°C by means of a temperature control device. Take an appropriate...

example 3

[0042] The Mg-3Zn-1.2Nd-0.6Y rare-earth magnesium alloy (the content of each alloy component is in mass percentage, the same below) is treated by ultrasonic vibration, and formed in a gravity metal mold. The melting and refining process is as follows: all tools in contact with the alloy melt are painted in advance, and tools, raw materials, and sampling water-quenched quartz tubes are all preheated at 200 ° C for more than 1 hour. Turn on the resistance furnace, add magnesium ingots when the crucible is preheated to about 150°C, and feed N when the temperature reaches 300°C 2 +SF 6 Protective gas, adjust the temperature to 700°C, add pure metal Zn, Mg-Nd master alloy, and Mg-Y master alloy in turn after the magnesium ingot is completely melted, adjust the temperature to 750°C, and feed high-purity Ar gas after the melt is completely melted Refining for 10 minutes, degassing and removing slag, and then removing scum. The temperature of the alloy liquid is kept at about 700°C ...

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Abstract

The invention belongs to the technical field of metal material preparation and casting formation, and relates to a method for refinement of a rare earth-rich phase of a rare earth-magnesium alloy. Rare earth in the rare earth-magnesium alloy comprises one, two or more of 0.5-4% of RE (which is mixture of Ce and La and comprises 50-70% by mass of Ce and the balance La), 0.5-2% of Y, 2-3% of Nd and 1-5% of Gd. The method comprises pouring a magnesium alloy liquid with the temperature 0-40 DEG C higher than that of a liquidus line into a slurry container pre-heated to a preset temperature, dropping an amplitude-change pole to a position 1-25mm lower than a metal liquid surface, simultaneously, starting ultrasonic vibration, carrying out ultrasonic vibration for 1-8min, then controlling a metal melt temperature 5-50 DEG C lower than a liquidus line temperature and carrying out molding on the metal melt subjected to ultrasonic vibration to obtain a magnesium alloy part. Crystal grain size and rare earth-rich phase size are greatly reduced than size of the microstructure before ultrasonic vibration. The method can be used for a rare earth-magnesium alloy pulping process, a follow-up rheocasting process and a rare earth-magnesium alloy part molding process.

Description

technical field [0001] The invention belongs to the technical field of preparation and casting of metal materials, and relates to a method for refining the rare earth-rich phase in the rare earth magnesium alloy. The method refines the rare earth-rich phase in the rare earth magnesium alloy by applying ultrasonic vibration, refines the grain Improve performance. technical background [0002] As a structural material, magnesium and magnesium alloys have a series of unique advantages such as low density, high specific strength and specific stiffness, good thermal conductivity, good machinability, strong electromagnetic shielding ability, good vibration and damping performance, and easy recycling. , to meet the requirements of the modern automobile industry for weight reduction and energy saving. Therefore, magnesium alloy structural materials are widely used in the fields of automobile, aerospace and electronics. [0003] Due to the low strength of magnesium alloy, especiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22B9/02C22C23/04
CPCY02P10/20
Inventor 吴树森吕书林赵立方晓刚毛有武
Owner HUAZHONG UNIV OF SCI & TECH
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