Rare earth-contained heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy and heat-resistant technology, which is applied in the field of low-cost heat-resistant magnesium alloy containing rare earth and zinc and its preparation, can solve the problems of limiting the wide application of WE43 alloy, reducing the mechanical properties of the alloy, and the mechanical properties at low room temperature, and achieving good Effect of solid solution strengthening and aging strengthening, improving high temperature properties, and excellent mechanical properties

Active Publication Date: 2013-12-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in its casting process, the molten state is easy to oxidize and produce line defects, which makes the casting process more harsh and increases the cost
The disadvantage of the above alloys is that the lower room temperature mechanical properties limit the wide application of WE43 alloys
After WE43 alloy was treated by T6, β' and coarse β were precipitated in the matrix 1 phase, see attached figure 1 , due to β 1 The appearance of the phase leads to a decrease in the mechanical properties of the alloy

Method used

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  • Rare earth-contained heat-resistant magnesium alloy and preparation method thereof
  • Rare earth-contained heat-resistant magnesium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Alloy composition (percentage by weight): 3%Sm, 2%Gd, 0.5%Zn, 0.5%Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0040] The melting process of the alloy is as follows: prepare the alloy according to the above ingredients, fully dry the raw materials in an oven at 180°C, add pure magnesium into the resistance crucible furnace, and use SF 6 and CO 2 Mixed gas (1:95) for protection, after the magnesium ingot is completely melted, add industrial pure zinc at 680 ° C, stir and melt; when the temperature of the magnesium liquid reaches 720 ° C, add Mg-Sm intermediate alloy to the magnesium liquid, After Mg-Sm is melted, when the temperature of the molten magnesium rises to 720°C, add the Mg-Gd master alloy; after raising the temperature of the magnesium liquid to 780°C, add the Mg-Zr master alloy, stir for 2 minutes to fully melt; raise the temperature to 790°C and After heat preservation for 15 minutes, cool down to 760°C, refine for 5 minutes, and stand s...

Embodiment 2

[0045] Alloy composition (percentage by weight): 4%Sm, 4%Gd, 0.5%Zn, 0.5%Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0046] The melting process of the alloy is as follows: prepare the alloy according to the above ingredients, fully dry the raw materials in an oven at 200°C, add pure magnesium into the resistance crucible furnace, and use SF 6 and CO 2 Mixed gas (1:100) for protection, after the magnesium ingot is completely melted, add industrial pure zinc at 700 ° C, stir and melt; when the temperature of the magnesium liquid reaches 720 ° C, add Mg-Sm intermediate alloy to the magnesium liquid, After Mg-Sm is melted, when the temperature of the magnesium liquid rises to 720°C, add the Mg-Gd master alloy; after the temperature of the magnesium liquid rises to 760°C, add the Mg-Zr master alloy, stir for 2 minutes to fully melt; heat up to 800°C and After heat preservation for 20 minutes, cool down to 740°C, refine for 10 minutes, and stand still after ref...

example 3

[0051] Alloy composition (percentage by weight): 5%Sm, 5%Gd, 1%Zn, 0.5%Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0052] The melting process of the alloy is as follows: prepare the alloy according to the above ingredients, fully dry the raw materials in an oven at 220°C, add pure magnesium into the resistance crucible furnace, and use SF 6 and CO 2 Mixed gas (1:105) for protection. After the magnesium ingot is completely melted, industrial pure zinc is added at 720°C; when the temperature of the magnesium liquid reaches 740°C, Mg-Sm intermediate alloy is added to the magnesium liquid, and the Mg-Sm After melting, when the temperature of the molten magnesium rises to 740°C, add the Mg-Gd master alloy; after raising the temperature of the magnesium liquid to 780°C, add the Mg-Zr master alloy, stir for 2 minutes to fully melt; keep the temperature at 780°C for 30 minutes, then cool down to 750 ℃, refining for 5 minutes, standing after refining, and the stan...

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Abstract

The invention discloses a rare earth-contained heat-resistant magnesium alloy and a preparation method thereof, belongs to the technical field of magnesium alloy preparation. The heat-resistant magnesium alloy disclosed by the invention comprises the following materials by weight: 2 to 8 percent of Sm, 0.5 to 6 percent of Gd, 0.1 to 2 percent of Zn, 0.1 to 1.5 percent of Zr, and Mg and inevitable impurity elements in balancing amount, wherein the total weight of the impurity elements is equal to or smaller than 0.02 percent. By adding ally elements (Sm, Gd and Zn) to replace Y and Nd of WE series alloies, and adjusting corresponding heat treatment processes to ensure that the prepared magnesium alloy has excellent indoor temperature intensity, high-temperature strength and plasticity, the indoor temperature intensity, high-temperature strength and plasticity of the magnesium alloy prepared according to the preparation method are more excellent than those of the conventional WE series commercial magnesium alloies; the preparation method of the magnesium alloy prepared according to the preparation method is lower than that of the conventional WE series commercial magnesium alloies. The process is simple; industrialized application is facilitated.

Description

technical field [0001] The invention relates to a heat-resistant magnesium alloy and a preparation method thereof, in particular to a low-cost heat-resistant magnesium alloy containing rare earth plus zinc and a preparation method thereof. Background technique [0002] Insufficient strength and poor heat resistance have hindered the pace of magnesium alloys replacing aluminum alloys and other materials in aerospace, military and other industries. Rare earth elements exhibit unique properties due to their unique arrangement of extranuclear electrons. During metallurgical processes, they can purify alloy melts, improve alloy structures, improve alloy room temperature and high temperature mechanical properties, and enhance alloy corrosion resistance. WE43 alloy (3.7-4.3%Y, 2.4-4.4%Nd, 0.4%Zr, balance Mg) can be used at a temperature of 200°C under the premise of ensuring performance. After T6 treatment, the tensile strength at room temperature is 250MPa, and the yield The stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06
Inventor 袁明郑子樵
Owner CENT SOUTH UNIV
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