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Long-periodic structure phase reinforced Mg-RE-Ni magnesium alloy semi-solid-state blank and preparation method thereof

A long-period structure, semi-solid technology, applied in the field of metal materials, can solve the problems that have not been found in the semi-solid billet research report of long-period structure reinforced Mg-RE-Ni magnesium alloy, and achieve high roundness and semi-solid forming Effect of low temperature and low sensitivity

Inactive Publication Date: 2016-11-09
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the literature search, there is no research report on the semi-solid blank of the long-period structurally reinforced Mg-RE-Ni magnesium alloy prepared by semi-solid isothermal heat treatment.

Method used

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  • Long-periodic structure phase reinforced Mg-RE-Ni magnesium alloy semi-solid-state blank and preparation method thereof
  • Long-periodic structure phase reinforced Mg-RE-Ni magnesium alloy semi-solid-state blank and preparation method thereof
  • Long-periodic structure phase reinforced Mg-RE-Ni magnesium alloy semi-solid-state blank and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Mg 97.3 Gd 2 Ni 0.7 A semi-solid magnesium alloy blank, which contains the following components (in atomic percentage): Mg: 97.3%, Gd: 2%, and Ni: 0.7%.

[0022] The preparation method of the semi-solid blank of the alloy is as follows:

[0023] Using pure Mg, pure Gd, and pure Ni as raw materials, according to Mg 97.3 Gd 2 Ni 0.7 Alloy formula ingredients; first melt Mg and raise the temperature to 760°C, then add pure Gd and pure Ni, then heat up to 790°C for 90 min, and stir evenly; then cool down to 690°C and hold for 5 min, then liquid metal It is cooled at a cooling rate of 30°C / s and solidified to obtain a master alloy ingot.

[0024] Thermal analysis of the master alloy ingot shows that the melting temperature of the long-period structure phase in the master alloy ingot is 537℃, while the melting temperature of the Mg phase is 585℃; it is higher than the melting temperature of the long-period structure phase and lower than the Mg phase. For the temperature ...

Embodiment 2

[0026] Example 2: Mg 97.3 Gd 1 Y 1 Ni 0.7 Magnesium alloy semi-solid billet, the billet contains the following composition (in atomic percentage): Mg: 97.3%, Gd: 1%, Y: 1%, Ni: 0.7%.

[0027] The preparation method of the semi-solid blank of the alloy is as follows:

[0028] Using pure Mg, pure Gd, pure Y, and pure Ni as raw materials, according to Mg 97.3 Gd 1 Y 1 Ni 0.7 Alloy formula ingredients; first melt Mg and raise the temperature to 760℃, then add pure Gd, pure Y and pure Ni, then heat up to 790℃ for 90 min, and stir evenly; then cool to 690℃ for 5 min, then The liquid metal is cooled at a cooling rate of 30°C / s and solidified to obtain a master alloy ingot.

[0029] Thermal analysis of the master alloy ingot shows that the melting temperature of the long-period structural phase in the master alloy ingot is 545℃, while the melting temperature of the Mg phase is 583℃; it is higher than the melting temperature of the long-period structural phase and lower than the Mg phase. Fo...

Embodiment 3

[0031] Example 3: Mg 97.3 Y 2 Ni 0.7 Magnesium alloy semi-solid billet, the billet contains the following composition (in atomic percentage): Mg: 97.3%, Y: 2%, Ni: 0.7%.

[0032] The preparation method of the semi-solid blank of the alloy is as follows:

[0033] Using pure Mg, pure Y, and pure Ni as raw materials, according to Mg 97.3 Y 2 Ni 0.7 Alloy formula ingredients; first melt the Mg and raise the temperature to 760°C, then add pure Y and pure Ni, then heat up to 790°C for 90 minutes, and stir evenly; then cool to 690°C and hold for 5 minutes, then melt the metal liquid It is cooled at a cooling rate of 30°C / s and solidified to obtain a master alloy ingot.

[0034] Thermal analysis of the master alloy ingot shows that the melting temperature of the long-period structural phase in the master alloy ingot is 552℃, while the melting temperature of the Mg phase is 595℃; it is higher than the melting temperature of the long-period structural phase and lower than the Mg phase. For th...

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Abstract

The invention discloses long-periodic structure phase reinforced Mg-RE-Ni magnesium alloy semi-solid-state blank and a preparation method thereof. The composition (in atomic percentage) of the semi-solid-state blank is as follows: Mg(100-x-y)RExNiy, wherein RE is at least one of an element Gd and an element Y; x is greater than 2 and smaller than 4; and y is greater than 0.7 and smaller than 1.5. The preparation method for the semi-solid-state blank comprises the following steps: taking pure Mg, pure Gd, pure Y and pure Ni as raw materials; smelting the raw materials to prepare master alloy ingot; carrying out low-temperature semi-solid-state equal-temperature thermal treatment on the master alloy ingot; and carrying out water quenching to obtain the magnesium alloy semi-solid-state blank. According to the long-periodic structure phase reinforced Mg-RE-Ni magnesium alloy semi-solid-state blank provided by the invention, the Mg-RE-Ni magnesium alloy is the high-strength magnesium alloy, the semi-solid-state forming temperature is low, sensitivity that the solid phase content changes with the temperature is low, and obtained solid phase is high in particle roundness. The preparation method for the semi-solid-state blank provided by the invention is low in preparation temperature, is less in oxidization and combustion, is easy to control in process, and is suitable for preparing a magnesium alloy part with high strength and a complex shape by adopting a semi-solid-state forming technology.

Description

Technical field [0001] The invention relates to an alloy semi-solid blank in the technical field of metal materials and a preparation method thereof, in particular to a long-period structural phase reinforced magnesium alloy semi-solid blank and a preparation method thereof. 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 The defects of oxidation, combustion, porosity and shrinkage in the production of magnesium alloy parts by ordinary die-casting methods lay the foundation for the large-scale promotion and application of magnesium alloys. The preparation of high-quality semi-solid blanks with non-dendritic structure is a prerequisite for semi-solid forming. There a...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/06C22F1/06
CPCC22C23/00C22C23/06C22F1/06
Inventor 尹健卢春辉
Owner NANCHANG HANGKONG UNIVERSITY
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