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Heterogeneous high damping magnesium alloy

A high damping, magnesium alloy technology, applied in the field of magnesium alloy production, can solve the same problems such as the reduction of damping performance

Inactive Publication Date: 2015-06-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alloy treated by T5 has more second phases, so the damping performance is reduced more in the same way.

Method used

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Effect test

preparation example Construction

[0010] The preparation method of alloy of the present invention comprises the steps:

[0011] 1. The raw material is industrial magnesium ingot (purity is 99.95wt%), melted in SG2-5-12 well-type resistance furnace, and SF6 protective gas is used in the melting process;

[0012] 2. After melting the magnesium ingot at 750°C, add a certain proportion of tin ingot (99.98wt% purity) and other alloying elements, and keep it in the furnace at 680-730°C for 20-40min;

[0013] 3. After the end, let it cool down and cast it in a protective atmosphere;

[0014] 4. The as-cast alloy is solidified at 460-500°C for 24 hours, then water-cooled, and then aged at 200-240°C for 10-24 hours;

[0015] 5. Damping performance test

[0016] The damping performance was characterized by the JN-1 Gerner pendulum tester. For the samples of each alloy composition in the as-cast state, T4 state, and T6 state, the circular cross-section alloy wire with a diameter of 1.5 mm and a length greater than 5 m...

Embodiment 1

[0019] The purity of magnesium and tin is respectively selected as Mg99.95wt%, Sn99.98wt%. First, put the pure magnesium ingot into the melting furnace, after it is completely melted, raise the temperature of the melt to 750°C, then add the preheated tin ingot into the melt, stir evenly, let it stand for 15 minutes, and then lower the temperature to 680°C ℃ casting, casting process is always in N 2 Gas and SF 6 under a protective atmosphere. The composition of the castings obtained is shown in Table 1.

[0020] Table 1 1# sample composition (weight percentage)

[0021]

[0022] As-cast microstructure such as figure 1 As shown, lamellar eutectic Mg2Sn can be seen. The as-cast alloy was dissolved in water at 500°C for 24 hours and then water-cooled, the eutectic Mg2Sn phase disappeared as figure 2 As shown, and then aged at 220°C for 12 hours, intermetallic compounds dispersed in the alloy such as image 3 shown. Respectively cut the cast state, T4, T6 state samples...

Embodiment 2

[0024] The purity of magnesium and tin is Mg99.95wt%, Sn99.98wt%, and Zr is Mg-30%Zr master alloy. First put the pure magnesium ingot into the melting furnace, after it is completely melted, raise the temperature of the melt to 750°C, then add the preheated tin ingot and Mg-Zr intermediate alloy into the melt, stir evenly, and let it stand for 15 minutes , and then cooling down to 680°C for casting, the casting process is always under N 2 Gas and SF 6 under a protective atmosphere. The composition of the castings obtained is shown in Table 2.

[0025] Table 2 2# sample composition (weight percentage)

[0026]

[0027] As-cast microstructure such as Figure 5 As shown, lamellar eutectic Mg2Sn can be seen. The as-cast alloy was dissolved in water at 500°C for 24 hours and then water-cooled, the eutectic Mg2Sn phase disappeared as Figure 6 As shown, and then aged at 220°C for 12 hours, dispersed intermetallic compounds were precipitated in the alloy such as Figure 7 s...

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Abstract

The invention discloses a heterogeneous high damping magnesium alloy. The content of Sn in the alloy is 0.01-50wt%. The alloy is prepared through the following steps: adding magnesium ingots into a well resistance furnace, melting, and adopting an SF6 protection gas in the melting process; heating the magnesium ingots to 750DEG C for fusion, adding a certain proportion of tin ingots and other alloy elements, and carrying out heat insulation in the 680-730DEG C furnace for 20-40min; standing for cooling after the heat insulation ends, and casting in protection atmosphere; and carrying out solid solution treatment on the above obtained cast alloy at 460-500DEG C for 24h, carrying out water cooling, and ageing by carrying out heat insulation at 200-240DEG C for 10-24h. The heterogeneous high damping magnesium alloy has dislocation and phase boundary composite controlled damping characteristic, and has excellent damping performance.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy production, in particular to a Mg-Sn series multi-phase high damping magnesium alloy. Background technique [0002] In recent years, with the development of many fields such as aerospace, transportation, light and heavy industry, large buildings and civil structures, lightweight has become a key area of ​​concern, but the vibration and noise problems caused by lightweight not only cause environmental problems Pollution affects the quality of life, and also affects the use of each part structure and even causes disastrous consequences. The use of damping materials such as magnesium alloys is a very effective way to reduce vibration and noise. It has the characteristics of high strength, light weight and small size, and can absorb vibration energy to reduce vibration and noise. [0003] Traditional damping alloys such as Mn-Cu, Zn-Al, etc. have high alloy density and poor heat resistance, w...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02C22F1/06
CPCC22C23/00C22C1/02C22F1/06
Inventor 刘红梅胥永刚陈辉陈宇高天学孙兵
Owner SOUTHWEST JIAOTONG UNIV
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