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Grain refinement type cast magnesium alloy and preparation method thereof

A technology for casting magnesium alloys and grain refinement, applied in the field of metal material casting, can solve problems such as low absolute strength, and achieve the effects of improving mechanical properties, improving resistance, and increasing the number of crystal nuclei

Active Publication Date: 2015-02-11
山东蒙沃变速器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of existing cast magnesium alloys is that the absolute strength is relatively low. For example, the tensile strength of cast magnesium alloy AZ91, which is widely used at present, can reach up to 280Mpa, and the highest tensile strength of cast magnesium alloy ZK61, the highest American standard brand, can only reach 300Mpa

Method used

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  • Grain refinement type cast magnesium alloy and preparation method thereof
  • Grain refinement type cast magnesium alloy and preparation method thereof
  • Grain refinement type cast magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A grain-refined cast magnesium alloy, the components and mass percentages are: ZrC: 0.2%, HfC: 0.2%, Al: 5%, Mn: 1%, Zn 0.8%, Ca: 1%, Yl. 5%, Sr 0.5%, the balance Mg and impurities;

[0035] The preparation method is as follows:

[0036] (1) Ingredients: The mass percentages of raw materials and various substances are: ZrC: 0.2%, HfC: 0.2%, Al: 5%, Mn: 1%, Zn 0.8%, Ca: 1%, Y 1.5%, Sr 0.5%, the balance Mg and impurities;

[0037] (2) Smelting: Use an iron crucible to smelt in an ordinary resistance furnace. First, metal Mg is smelted. Measured and preheated pure metal Al, metal Mn, metal Ca, metal Y and metal Sr, control the melting temperature of 720°C to 770°C, and use Cl salt molten salt as the melting protective layer to obtain liquid metal;

[0038] (3) Casting: quickly cool the molten metal to 710°C to 750°C for pouring, and ensure that the casting is completed within 45 minutes;

[0039] (4) Heat treatment: solid solution the product obtained in step (3) at 38...

Embodiment 2

[0042] A grain-refined cast magnesium alloy, the components and mass percentages are: ZrC: 0.8%, HfC: 0.8%, Al: 6%, Mn: 2%, Zn 1%, Ca: 3%, Y 2 %, Sr 0.58%, the balance Mg and impurities;

[0043] The preparation method is as follows:

[0044] (1) Ingredients: The mass percentages of raw materials and various substances are ZrC: 0.8%, HfC: 0.8%, Al: 6%, Mn: 2%, Zn 1%, Ca: 3%, Y 2%, Sr 0.58% , the balance Mg and impurities;

[0045] (2) Smelting: Use an iron crucible to smelt in an ordinary resistance furnace. First, metal Mg is smelted. Measured and preheated pure metal Al, metal Mn, metal Ca, metal Y and metal Sr, control the melting temperature of 720°C to 770°C, and use Cl salt molten salt as the melting protective layer to obtain liquid metal;

[0046] (3) Casting: quickly cool the molten metal to 710°C to 750°C for pouring, and ensure that the casting is completed within 45 minutes;

[0047] (4) Heat treatment: solid solution the product obtained in step (3) at 380°C-4...

Embodiment 3

[0050] A grain-refined cast magnesium alloy, the components and mass percentages are: ZrC: 1.2%, HfC: 1.2%, Al: 8%, Mn: 2%, Zn 1.2%, Ca: 3%, Y3% , Sr 1%, the balance Mg and impurities;

[0051] The preparation method is as follows:

[0052] (1) Ingredients: The mass percentages of raw materials and various substances are ZrC: 1.2%, HfC: 1.2%, Al: 8%, Mn: 2%, Zn 1.2%, Ca: 3%, Y3%, Sr 1%, The balance of Mg and impurities;

[0053] (2) Smelting: Use an iron crucible to smelt in an ordinary resistance furnace. First, metal Mg is smelted. Measured and preheated pure metal Al, metal Mn, metal Ca, metal Y and metal Sr, control the melting temperature of 720°C to 770°C, and use Cl salt molten salt as the melting protective layer to obtain liquid metal;

[0054] (3) Casting: quickly cool the molten metal to 710°C to 750°C for pouring, and ensure that the casting is completed within 45 minutes;

[0055] (4) Heat treatment: solid solution the product obtained in step (3) at 380°C-420...

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Abstract

The invention relates to a grain refinement type cast magnesium alloy which comprises the following ingredients in percentage by weight: 0.2%-1.5% of ZrC, 0.2%-1.5% of HfC, 5%-9% of Al, 1%-3% of Mn, 0.8%-1.5% of Zn, 1%-3% of Ca, 1.5%-3.5% of Y, 0.5%-1.2% of Sr, and the balance of Mg and inevitable impurities. A preparation method of the magnesium alloy comprises the following steps of: (1) preparation of the ingredients; (2) melting; (3) casting; (4) thermal treatment. For the alloy, the room-temperature tensile strength is greater than or equal to 300MPa, and the elongation percentage is greater than or equal to 5%; under the condition of 175 DEG C and 75MPa, the 1000h total creep elongation percentage of the alloy is lower than 1.8%, thus providing a technology support for meeting the high-standard requirement of electronic communication, transportation, spaceflight and national defense fields on the cast magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal material casting, and in particular relates to a cast magnesium alloy capable of improving the strength of the magnesium alloy through grain refinement and a preparation method thereof. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application, with a small specific gravity (1.75~1.85×103kg / m 3 , about 64% of aluminum, 23% of steel), high specific strength and specific stiffness, good damping and machinability, large impact energy absorption, and easy recycling and other advantages, it has been widely used in automotive, aerospace, electronics and other fields With increasingly wide applications, it is considered to be an ideal material for effective weight reduction, energy saving, environmental friendliness, and sustainable development. However, the strength of ordinary magnesium alloys is not high, so they cannot be used in the man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/02
Inventor 张志东王守仁张少运吴伟刘子利彭玉兰
Owner 山东蒙沃变速器有限公司
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