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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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  • Summary
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  • Claims
  • Application Information

AI 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 Composite strengthening of magnesium alloys with Sn overcomes the problem of simply using Mg 2 Si or Mg 2 Insufficient heat resistance and poor comprehensive mechanical properties of Sn-enhanced magnesium alloys

Method used

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

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Embodiment 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%), according to the composition of Mg-3Si-3Sn alloy formulation alloy, in RJ- 2 Under the protection of flux, first melt the pure magnesium ingot in a resistance furnace, when the temperature rises to 780°C, add silicon powder and keep it warm for 1 hour, then add pure tin, keep it warm for 5 minutes, and then carry out mechanical stirring to make the alloying element silicon Homogenize with tin, let it stand for 10-15 minutes, and finally when the temperature drops to 720°C, remove the scum on the surface of the alloy liquid, 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 ca...

Embodiment 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. Afterwards, the casting is kept in a box-type resistance furnace with a protective atmosphere, and then quickly taken out and put into water for quenching. The isothermal heat treatment temperature is 490 ° C, and the holding time is 4 hours. The metallographic structure of the alloy obtained by adopting the present invention is observed, and the result is shown in FIG. 3 . As can be seen from the figure, compared with the as-cast metallographic structure diagram (Fig. 1) of Mg-3Si-3Sn magnesium alloy without isothermal heat treatment, after adopting the method proposed by the present invention to process, the alloy structure has the shape of Chinese characters or fibrous eutectic Mg 2 Most of the Si phase has become granular, indicating that the method proposed by the present invention is used to process the Mg-3Si-3Sn magnesium all...

Embodiment 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. Afterwards, the casting is kept in a box-type resistance furnace with a protective atmosphere, and then quickly taken out and put into water for quenching. The isothermal heat treatment temperature is 520 ° C, and the holding time is 2 hours. The metallographic structure analysis of the alloy obtained by adopting the present invention is shown in Figure 4. As can be seen from the figure, after adopting the method proposed by the present invention to process the alloy, 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 by the present invention is used to process the Mg-3Si-3Sn magnesium alloy, which can make the Chinese character or fibrous eutectic Mg in the alloy structure 2 Si phase modification.

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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.

Description

[0001] Technical field [0002] The invention relates to a Mg-Si-Sn series magnesium alloy and a heat treatment process for modifying the eutectic Mg2Si phase in Chinese characters. Background technique [0003] As the lightest engineering metal structure material, magnesium alloy has many excellent properties such as high specific strength and specific stiffness, good electrical and thermal conductivity, good damping and shock absorption and electromagnetic shielding performance, easy to form, and good recycling And so on, it is considered as the "green engineering material" with the most development prospect and application potential in this century. However, the low heat resistance (thermal strength and thermal stability) of magnesium alloys limits its further application. [0004] At present, the heat-resistant magnesium alloy system mainly includes magnesium-aluminum system, magnesium-zinc system and magnesium-rare earth system. For magnesium-aluminum series, there are ...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22F1/06
Inventor 李新林肖柳李莉王香郑玉峰马国睿冯丹
Owner HARBIN ENG UNIV
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