Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy

A technology for semi-solid forming and magnesium alloys, which is applied in the field of preparation of Mg-Gd-Zn-Zr magnesium alloys and semi-solid blanks, which can solve the problems of increased risk of oxidation and combustion of magnesium alloys, lower quality of finished magnesium alloys, and increased semi-solid Solve the problems of solid state forming energy consumption and production cost, and achieve the effects of high roundness of solid phase particles, low forming temperature, less oxidation and combustion

Inactive Publication Date: 2016-08-31
NANCHANG HANGKONG UNIVERSITY
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AI Technical Summary

Problems solved by technology

However, due to the high melting point of Mg in Mg-RE high-strength rare earth magnesium alloys, the temperature for semi-solid isothermal heat treatment to prepare semi-solid billets and the corresponding semi-solid forming temperature is relatively high, often higher than 600 °C ( For example, "Microstructure evolution during reheating of extruded Mg-Gd-Y-Zr alloy into semisolid state" published by Gao Lei, "Transactions of NonferrousMetals Society of China" 2010, Volume 20, pages 1585-1590; Guohua Wu published "Microstructure evolution of semi-solid Mg-10Gd-3Y-0.5Zr alloy during isothermal heat treatment", "Journal of Magnesium and alloys" 2013, Volume 1, pages 39-46), leading to an increase in the risk of magnesium alloy oxidation and combustion, thereby reducing the risk of magnesium alloy finished products Reduced quality, increased energy consumption and production costs for semi-solid forming

Method used

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  • Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy
  • Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy
  • Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and preparation method for semisolid blank of semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Mg-15Gd-2Zn-0.5Ni-0.3Zr alloy, wherein Gd: 15%, Zn: 2.0%, Ni: 0.5%, Zr: 0.3% (weight percentage), and the rest is Mg.

[0025] The preparation method of the semi-solid blank of the alloy comprises the following steps:

[0026] The first step, batching: use pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr master alloy as raw materials, and batch according to the Mg-15Gd-2Zn-0.5Ni-0.3Zr alloy formula.

[0027] The second step, melting: After melting Mg, the temperature is raised to 750°C, after adding pure Gd, pure Zn, and pure Ni, then the temperature is raised to 780°C and kept for 120 minutes, and then the molten metal is evenly stirred; then the temperature drops to 750°C , add Mg-30wt.%Zr master alloy, keep warm for 30 minutes, and finally stir evenly to obtain a metal liquid with uniform composition.

[0028] The third step, solidification: heat the metal liquid obtained in the second step at 710°C for 10 minutes, then cool it at a cooling rate of 20...

Embodiment 2

[0031] Example 2: Mg-15Gd-2.8Zn-0.3Ni-0.5Zr alloy, wherein Gd: 15%, Zn: 2.8%, Ni: 0.3%, Zr: 0.5% (weight percentage), and the rest is Mg.

[0032] The preparation method of the semi-solid blank of the alloy comprises the following steps:

[0033] The first step, batching: use pure Mg, pure Gd, pure Zn, pure Ni and Mg-30wt.%Zr master alloy as raw materials, and batch according to the Mg-15Gd-2.8Zn-0.3Ni-0.5Zr alloy formula.

[0034] The second step, melting: After melting Mg, the temperature is raised to 750°C, after adding pure Gd, pure Zn, and pure Ni, then the temperature is raised to 780°C and kept for 120 minutes, and then the molten metal is evenly stirred; then the temperature drops to 750°C , add Mg-30wt.%Zr master alloy, keep warm for 30 minutes, and finally stir evenly to obtain a metal liquid with uniform composition.

[0035] The third step, solidification: heat the metal liquid obtained in the second step at 710°C for 10 minutes, then cool it at a cooling rate of ...

Embodiment 3

[0038] Example 3: Mg-15Gd-3.6Zn-0.7Zr alloy, wherein Gd: 15%, Zn: 3.6%, Zr: 0.7% (weight percentage), and the rest is Mg.

[0039] The preparation method of the semi-solid blank of the alloy comprises the following steps:

[0040] The first step, batching: use pure Mg, pure Gd, pure Zn and Mg-30wt.%Zr master alloy as raw materials, and batch according to the Mg-15Gd-3.6Zn-0.7Zr alloy formula.

[0041] The second step, melting: After melting Mg, the temperature is raised to 750°C, after adding pure Gd and pure Zn, then the temperature is raised to 780°C and kept for 120 minutes, and then the molten metal is evenly stirred; then when the temperature drops to 750°C, add Mg -30wt.% Zr master alloy, keep it warm for 30 minutes, and finally stir evenly to obtain a metal liquid with uniform composition.

[0042] The third step, solidification: heat the metal liquid obtained in the second step at 710°C for 10 minutes, then cool it at a cooling rate of 5°C / s, and obtain a master alloy...

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Abstract

The invention discloses an Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy for semisolid forming and a preparation method for a semisolid blank of the semisolid Mg-Gd-Zn-Ni-Zr rare-earth magnesium alloy. The alloy comprises the following components in percentage by weight: 15-21% of Gd, 2.0-3.6% of Zn, 0-0.5% of Ni, 0.3-0.7% of Zr and Mg in balancing amount. The preparation method for the semisolid blank comprises the following steps: taking pure Mg, pure Gd, pure Zn, pure Ni and an Mg-30wt.%Zr intermediate alloy as raw materials, first smelting the raw materials to prepare a master alloy ingot, then performing low-temperature semisolid isothermal heat treatment of the master alloy ingot, and finally performing water quenching to obtain the semisolid blank. The magnesium alloy for semisolid forming, provided by the invention, belongs to an Mg-RE series high-strength magnesium alloy, the semisolid forming temperature of the magnesium alloy is low, the solid-phase content of the magnesium alloy has low susceptibility to temperature variation, and the roundness of obtained solid-phase particles is high. According to the preparation method for the semisolid blank, provided by the invention, the preparation temperature is low, less oxidation and combustion are caused, the process is easy to control, and a semisolid forming technology is appropriate for preparing high-strength and complex-shaped magnesium alloy parts.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a Mg-Gd-Zn-Zr magnesium alloy for semi-solid forming and a preparation method of the semi-solid blank. Background technique [0002] Semi-solid metal forming technology has many advantages such as high efficiency, energy saving, near (net) forming production, and high performance of formed parts. It is known as the most promising metal material processing technology in the 21st century, especially the semi-solid forming of magnesium alloys, which can greatly reduce Defects such as oxidation, combustion, porosity, and shrinkage porosity in the production of magnesium alloy parts by ordinary die-casting methods lay the foundation for the wide-scale promotion and application of magnesium alloys. The preparation of high-quality blanks with non-dendritic structure is the premise of semi-solid forming. There are many methods for preparing magnesium alloy semi-solid...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/06C22C1/12
Inventor 尹健卢春辉
Owner NANCHANG HANGKONG UNIVERSITY
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