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Method for adjusting and regulating long-periodic structure phase of magnesium alloy

A long-period structure and magnesium alloy technology, which is applied in the field of metal material preparation, can solve the problems of limiting the application of magnesium alloys, low strength of magnesium alloys, and easy oxidation corrosion, etc., and achieve the effect of reducing splitting, strengthening alloys, and eliminating LPSO phases

Active Publication Date: 2017-02-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to basic problems such as low strength, poor plasticity, and easy oxidation and corrosion of magnesium alloys, the application of magnesium alloys is greatly limited. Therefore, finding effective strengthening methods is a key issue in the development of high-strength magnesium alloys.

Method used

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  • Method for adjusting and regulating long-periodic structure phase of magnesium alloy
  • Method for adjusting and regulating long-periodic structure phase of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] An alloy with a chemical composition of Mg-2.8Ni-3.8Y-0.4Zr (wt.%) was prepared. Using 99.9% pure magnesium, 99.9% pure nickel, Mg-30%Y and Mg-30%Zr master alloy as raw materials, and drying at 200°C for 30min. Put the magnesium ingot into the crucible 2 in the smelting furnace 1, heat it up to 500°C for 10 minutes, and continue to heat up to 700°C. After the magnesium ingot is completely melted, add nickel chips into the melt and heat up to 770°C; after the nickel chips dissolve, add Mg-30%Zr and Mg-30%Y master alloys and keep warm for 30min; then heat up to 780°C for stirring . After all the raw materials are melted, adjust the temperature of the melt to stabilize the temperature of the melt at 730°C, then introduce high-purity argon for refining, adjust the flow of argon to ensure that the molten metal does not splash, last for 12 minutes, and remove surface scum , let stand for 30min. The whole smelting process is fed with N through the vent pipe 3 2 and SF 6 M...

Embodiment 2

[0041] An alloy with a chemical composition of Mg-1.4Zn-3.0Y-0.3Zr (wt.%) was prepared. 99.9% pure magnesium, 99.9% pure zinc, Mg-10%Y and Mg-20%Zr master alloys are used as raw materials, and dried at 150°C for 50min. First put the magnesium ingot into the crucible 2 in the smelting furnace 1, heat it up to 500°C with the furnace, keep it warm for 10 minutes, and continue to heat up to 700°C. After the magnesium ingot is completely melted, heat up to 770°C, add small pieces of zinc and Mg-30%Zr, Mg-30%Y alloys and keep warm for 30min; then heat up to 780°C for stirring. After all the raw materials are melted, adjust the temperature of the melt to 730°C, pass high-purity argon into it for refining, adjust the flow rate of argon to ensure that the molten metal does not splash, continue to ventilate for 10 minutes, then remove the surface scum, and let it stand for 30 minutes . The whole smelting process is fed with N through the vent pipe 3 2 and SF 6 Mixed gas protection. ...

Embodiment 3

[0044] An alloy with a chemical composition of Mg-1.0Ni-2.0Y (wt.%) was prepared. 99.9% pure magnesium, 99.9% pure nickel, and Mg-20% Y master alloy are used as raw materials, and dried at 200°C for 60 minutes. Put the magnesium ingot into the crucible 2 in the smelting furnace 1, heat it up to 500°C for 10 minutes, and continue to heat up to 700°C. After the magnesium ingots are completely melted, nickel chips are added to the melt, and the temperature is raised to 770°C and kept for 30 minutes; after the nickel chips are dissolved, Mg-30%Y master alloy is added and kept for 30 minutes; then the temperature is raised to 780°C for stirring. After all the raw materials are melted, adjust the temperature control of the smelting furnace to stabilize the melt temperature at 740°C, then feed high-purity argon for refining, adjust the flow of argon to ensure that the molten metal does not splash, last for 15 minutes, and remove the surface Scum, let stand for 40min. The whole smel...

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Abstract

The invention discloses a method for adjusting and regulating a long-periodic structure phase of magnesium alloy. The method comprises the steps of: firstly preparing Mg-Ni (or Zn)-Y alloy containing LPSO, and then adjusting and regulating form and distribution of a long-periodic structure by applying ultrasonic vibration and pressure in sequence in an alloy solidification process. The alloy preparing and processing comprises the following steps: melting the alloy under protection of mixed gas of N2 and SF6, after temperature reaches 720-730 DEG C, placing a melt in a container in a holding furnace, cooling to a temperature more than a liquidus temperature of the alloy by more than 10-50 DEG C, then performing ultrasonic vibration processing on the melt, lasting for 1-5min, after the vibration is finished, pouring into a preheated die of 200-300 DEG C for extruding to solidify under pressure, wherein an extruding pressure is 50-500 MPa, and pressure holding time is 1-3min. The LPSO phase in the alloy prepared by such method is obviously refined and uniformly distributed, and performances of the alloy are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a method for regulating the long-period structural phase of magnesium alloys. Background technique [0002] Magnesium alloy is the lightest metal structural material in engineering applications. It has the characteristics of low density, excellent casting performance and machinability, good vibration reduction and damping performance, etc. It has significant advantages in realizing light weight and reducing energy consumption. It has been widely used in the fields of automobile, aerospace, electronic technology and so on. However, due to basic problems such as low strength, poor plasticity, and easy oxidation and corrosion of magnesium alloys, the application of magnesium alloys is greatly limited. Therefore, finding effective strengthening methods is a key issue in the development of high-strength magnesium alloys. [0003] The long-period structure (LPSO) in m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/09C22C23/06C22C1/03
CPCB22D27/09C22C1/03C22C23/06
Inventor 吕书林杨雄吴树森郝良彦
Owner HUAZHONG UNIV OF SCI & TECH
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