Mg-Si-Sn series magnesium alloy and heat treatment process for deteriorate Chinese character shaped eutectic Mg2Si phase therein

A magnesium alloy, mg-si-sn technology, applied in the field of heat treatment technology, can solve the problems of insufficient heat resistance and poor comprehensive mechanical properties of Sn-enhanced magnesium alloys, so as to overcome the lack of heat resistance, improve production efficiency, and improve high temperature Effects of Tensile and Creep Properties

Inactive Publication Date: 2008-04-16

HARBIN ENG UNIV

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AI-Extracted Technical Summary

Problems solved by technology

By jointly adding the typical cheap elements Si and Sn with precipitation strengthening effect, the two can form a very effective high melting point strengthening phase Mg with magnesium 2 Si and Mg 2 Compo...

Abstract

The invention proposes an Mg-Si-Sn series magnesium alloy and the heat treatment technics for changing the quality of eutectic crystal Mg2Si phase with a Chinese character shape. The preferred compositions and weight percentage of the Mg-Si-Sn series magnesium alloy are as follows: 3 percent of Sil, Sn of 1 percent to 3 percent of Sn and remaining Mg. The Mg-Si-Sn series magnesium alloy adopts industrial pure magnesium ingot, industrial polyeristalline silicon powder and pure tin ingot to melt and cast. The Mg-Si-Sn series magnesium alloy casting member which is melted according to ingredient formulation is placed into box type resistance furnace with protective atmosphere for preserving heat, in which the range of temperature is from 490 DEG C to 550 DEG C and the time of heat preservation is from 1 hours to 4 hours; and then the casting member is quickly taken out and put into water for quenching. The invention opens a novel path for developing cheap heat resistant magnesium alloy. The Mg-Si-Sn series magnesium alloy is thought as one of the cheap heat resistant magnesium alloys with the most developing potential and can be used to produce parts such as automobile engine tank cover, crankcase, gear box and the like.

Technology Topic

Magnesium alloyHeat treated +6

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Examples

Experimental program(4)

Example Embodiment

[0023] Example 1:

[0024] Using industrial pure magnesium ingot (purity 99.5%), industrial crystalline silicon powder (purity 99.4%, particle size 0.5-2mm) and pure tin ingot (purity 99.9%), the alloy is prepared according to the Mg-3Si-3Sn alloy composition, and the alloy is prepared in RJ- 2 Under the protection of the flux, first melt the pure magnesium ingot in a resistance furnace, when the temperature rises to 780℃, add silicon powder and keep it for 1 hour, then add pure tin, keep it for 5 minutes, and then perform mechanical stirring to make the alloying element silicon Homogenize with tin and let it stand for 10-15 minutes. Finally, when the temperature drops to 720°C, remove the scum on the surface of the alloy liquid and pour it into a metal mold or sand mold for gravity casting. The metallographic structure observation and X-ray diffraction (XRD) analysis of the as-cast Mg-3Si-3Sn alloy obtained by the present invention are shown in Fig. 1 and Fig. 2 respectively. Combining Figure 1 and Figure 2, it can be seen that the as-cast Mg-3Si-3Sn alloy consists of α-Mg matrix and granular Mg 2 Sn phase, polygonal primary Mg 2 Si phase and Chinese character-like or fibrous eutectic Mg 2 Si phase composition.

Example Embodiment

[0025] Example 2:

[0026] The Mg-3Si-3Sn magnesium alloy smelted according to the composition ratio is poured into a metal mold or a sand mold for gravity casting. After that, the casting is placed in a box-type resistance furnace with a protective atmosphere for heat preservation, and then quickly taken out and placed in water for quenching. The isothermal heat treatment temperature is 490°C and the heat preservation time is 4 hours. The metallographic structure of the alloy obtained by the present invention was observed, and the result is shown in FIG. 3. It can be seen from the figure that compared with the as-cast metallographic structure of the Mg-3Si-3Sn magnesium alloy without isothermal heat treatment (Figure 1), after the method proposed by the present invention is processed, the alloy structure has a Chinese character shape Or fibrous eutectic Mg 2 Most of the Si phase has become granular, indicating that the method proposed in the present invention can be used to treat the Mg-3Si-3Sn magnesium alloy, which can make the alloy structure in the Chinese character or fibrous eutectic Mg 2 The Si phase changes.

Example Embodiment

[0027] Example 3:

[0028] The Mg-3Si-3Sn magnesium alloy smelted according to the composition ratio is poured into a metal mold or a sand mold for gravity casting. After that, the casting was placed in a box-type resistance furnace with a protective atmosphere for heat preservation, and then quickly taken out and put into water for quenching. The isothermal heat treatment temperature was 520°C and the heat preservation time was 2 hours. The metallographic structure of the alloy obtained by the present invention is analyzed, and the result is shown in FIG. 4. It can be seen from the figure that after the alloy is processed by the method proposed in the present invention, the Chinese-character or fibrous eutectic Mg in the alloy structure 2 Most of the Si phase has become granular, indicating that the method proposed in the present invention can be used to treat the Mg-3Si-3Sn magnesium alloy, which can make the alloy structure in the Chinese character or fibrous eutectic Mg 2 The Si phase changes.

PUM

Property	Measurement	Unit
Particle size	0.5 ~ 2.0	mm

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Mg-Si-Sn series magnesium alloy and heat treatment process for deteriorate Chinese character shaped eutectic Mg2Si phase therein

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Description & Claims & Application Information

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