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Magnesium-tin-based alloy and preparation method thereof

A technology of tin-based alloy and five elements, applied in the field of new magnesium-tin-based alloy and its smelting and heat treatment process, can solve the problems of long time to reach the peak of aging, which is not conducive to industrial production, and achieve energy saving and high temperature stability. The effect of good performance and equipment cost saving

Inactive Publication Date: 2010-07-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This series of magnesium-tin-based alloys has a certain aging strengthening effect, but the time to reach the aging peak is longer
The alloy is aged at 200-250°C, the aging peak is between 70 and 75HV, and the time required to reach the aging peak is between 70h and 100h, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Prepare magnesium-tin-based alloy billet

[0027] (1) Ingredients are prepared according to the following components and mass percentages: 6% tin, 2% zinc, 0.2% manganese, 0.1% silver, and the rest are magnesium; the purity of the raw materials is 99.999%, and the crucible and casting molds are made of low carbon steel material. The target temperature of the crucible is set at 700°C; then the various ingredients are preheated to 160°C in an oven, and at the same time, the RJ-2 covering agent that accounts for 2wt% of the total weight of the prepared magnesium-tin-based alloy is put into the oven and baked ;Preheat the casting mold to 300°C in another box furnace;

[0028] (2) When the temperature of the crucible rises to 300°C, CO 2 Gas into the crucible for gas replacement, then add about 1 / 2 of the baked covering agent at the bottom of the crucible, and then put the preheated pure magnesium ingredients into the crucible;

[0029] (3) After the magnesium ing...

Embodiment 2

[0037] Step 1: Prepare magnesium-tin-based alloy billet

[0038] (1) Dosing according to the following components and mass percentage content: 7% tin, 2.5% zinc, 0.3% manganese, 0.3% silver, and the rest is magnesium. The purity of the raw materials is 99.999%, and the crucible and casting molds are made of low carbon steel. Set the target temperature of the crucible to 710°C, then preheat the various ingredients in an oven to 160°C, and simultaneously put the RJ-2 covering agent that accounts for 2wt% of the total weight of the prepared magnesium-tin-based alloy into the oven for baking ;Preheat the casting mold to 300°C in another box furnace;

[0039] (2) When the temperature of the crucible rises to 300°C, CO 2 Gas into the crucible for gas replacement, then add about 1 / 2 of the baked covering agent at the bottom of the crucible, and then put the preheated pure magnesium ingredients into the crucible;

[0040] (3) After the magnesium ingredients are melted and the tempe...

Embodiment 3

[0048] Step 1: Prepare magnesium-tin-based alloy billet

[0049](1) Dosing according to the following components and mass percentage content: 8% tin, 3% zinc, 0.5% manganese, 0.5% silver, and the rest is magnesium. The purity of the raw materials is 99.999%, and the crucible and casting molds are made of low carbon steel. Set the target temperature of the crucible to 720°C and start heating. Then various ingredients are placed in the oven and preheated to 160 ° C, and the RJ-2 covering agent that accounts for 2wt% of the total weight of the prepared magnesium-tin-based alloy is put into the oven and baked; the casting mold is placed in another box Preheat the furnace to 300°C.

[0050] (2) When the temperature of the crucible rises to 300°C, CO 2 Gas into the crucible for gas replacement, then add about 1 / 2 of the baked covering agent to the bottom of the crucible, and then put the preheated pure magnesium ingredients into the crucible.

[0051] (3) After the magnesium ing...

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Abstract

The invention relates to a magnesium-tin-based alloy and a preparation method thereof, which belong to the technical field of the metal structural material and the preparation. The magnesium-tin-based alloy comprises the following components by weight percent: 6 to 8 percent of tin, 2 to 3 percent of zinc, 0.2 to 0.5 percent of manganese, 0.1 to 0.5 percent of silver and rest magnesium. The preparation method comprises the following steps that: the components are sequentially arranged inside a crucible to be heated, mixed and settled into alloy liquid, and the alloy liquid is poured into a cold mould to form a magnesium-tin-based alloy ingot; the magnesium-tin-based alloy ingot is arranged into a resistance furnace to be heated at an air atmosphere and to be quenched with cold water to obtain the homogenized magnesium-tin-based alloy; and finally the homogenized magnesium-tin-based alloy is arranged inside a conventional resistance furnace to be undertaken the timely heat treatment at the air atmosphere and to be quenched with cold water to obtain the timely-reinforced magnesium-tin-based alloy. The method has simple smelting process, the sedimentation strengthening can be performed through the heat treatment, the timely peak value can be reached within a short time, the hardness value is above 80HV, the structure at high temperature is stable, the additive amount of the silver is less, the cost is within the available range, and the magnesium-tin-based alloy has commercial potential.

Description

technical field [0001] The invention belongs to the technical field of metal structural materials and preparation, in particular to a novel rare earth-free magnesium-tin-based alloy and its smelting and heat treatment processes. Background technique [0002] Magnesium alloy is a new type of light alloy. Compared with aluminum alloy and titanium alloy, it has the advantages of lower density, better damping performance and superior casting performance. The development of high-performance magnesium alloys has become a hot spot in the field of metal materials in various countries in recent years. Magnesium-aluminum series is the most commonly used magnesium alloy series, but the service temperature of existing magnesium-aluminum alloys is generally lower than 150°C, which cannot meet the requirements of many components. At present, commercial magnesium alloys that can improve high-temperature strength and creep properties mainly use rare earth elements as the main alloying elem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06
Inventor 石章智张文征
Owner TSINGHUA UNIV
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