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Dual deterioration method of hypereutectic Al-Si alloy

A hypereutectic, al-si technology, applied in the field of metal materials, can solve the problems of weakened metamorphism, environmental pollution, unstable effect, etc., and achieve the effect of convenient operation and simple process

Inactive Publication Date: 2015-09-02
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still interactions between elements and weakening of metamorphism for compound metamorphism (such as: 3Na+AlP=Na 3 P+Al, 2AlP+3Sr=Al+Sr 3 P 2 and other metallurgical reactions), environmental pollution, unstable effects, etc.

Method used

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  • Dual deterioration method of hypereutectic Al-Si alloy
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Examples

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Effect test

Embodiment 1

[0022] (1) Fine-grained hypereutectic Al-17% Si alloy master alloy thin strips were prepared by rapid solidification using the single-roll stripping method. During the preparation process, the single-roll speed was 40m / s, and when the instantaneous maximum temperature was 1300°C, the solidification speed was 10 6 k / s; the obtained thin ribbon can be prepared continuously, the surface is smooth, free of flying spurs and obvious macroscopic defects, and its macroscopic morphology and microstructure are as follows figure 1 and figure 2 Shown; Among them, the primary crystal Si is small in size, with an average size of about 1 μm, and the eutectic Si is in the form of highly branched fibers.

[0023] (2) Melt the substrate hypereutectic Al-17% Si alloy in a resistance furnace, heat up to 750°C, and keep it warm for 15 minutes to obtain molten hypereutectic Al-Si alloy metal liquid; unmodified hypereutectic Al-17% Si alloy original microstructure such as image 3 As shown, the p...

Embodiment 2

[0026] (1) Fine-grained hypereutectic Al-17% Si alloy master alloy thin strips were prepared by rapid solidification using the single-roll stripping method. During the preparation process, the single-roll speed was 40m / s, the instantaneous maximum temperature was 1300°C, and the solidification speed was 10 6 k / s; the obtained master alloy strip has a width of 2-3 mm and a thickness of 10 μm, and its macroscopic appearance and microstructure are as follows figure 1 and figure 2 Shown; Among them, the primary crystal Si is small in size, with an average size of about 1 μm, and the eutectic Si is in the form of highly branched fibers.

[0027] (2) Melt the substrate hypereutectic Al-17% Si alloy in a resistance furnace, heat up to 780°C, and keep it warm for 15 minutes to obtain molten hypereutectic Al-Si alloy metal liquid; unmodified hypereutectic Al-17% Si alloy original microstructure such as image 3 As shown, the primary Si is in the shape of a thick plate with an averag...

Embodiment 3

[0030] (1) Fine-grained hypereutectic Al-17% Si alloy master alloy thin strips were prepared by rapid solidification using the single-roll stripping method. During the preparation process, the single-roll speed was 40m / s, the instantaneous maximum temperature was 1300°C, and the solidification speed was 10 6 k / s; the obtained master alloy strip has a width of 2-3 mm and a thickness of 10 μm, and its macroscopic appearance and microstructure are as follows figure 1 and figure 2 Shown; Among them, the primary crystal Si is small in size, with an average size of about 1 μm, and the eutectic Si is in the form of highly branched fibers.

[0031] (2) Melt the substrate hypereutectic Al-17% Si alloy in a resistance furnace, heat up to 790°C, and keep it warm for 15 minutes to obtain molten hypereutectic Al-Si alloy metal liquid; unmodified hypereutectic Al-17% Si alloy original microstructure such as image 3 As shown, the primary Si is in the shape of a thick plate with an averag...

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Abstract

The invention discloses a dual deterioration method of a hypereutectic Al-Si alloy. An intermediate alloy of fine grain hypereutectic Al-Si alloy is added to achieve dual deterioration of primary crystal Si and eutectic Si, the intermediate alloy has the same components as a matrix alloy, impurities and elements are prevented from being introduced into the reaction, the process is simple and the operation is convenient; the size of the primary crystal Si in the hypereutectic Al-Si alloy is thinned from 44 microns to 14 microns after deterioration, the eutectic Si is deteriorated from a faller gill shaped into a highly branched fiber shape.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a double modification method of a hypereutectic Al-Si alloy. Background technique [0002] Hypereutectic Al-Si alloy has a series of excellent properties such as small linear expansion coefficient, high dimensional stability, good wear resistance, good corrosion resistance, good casting performance, and low casting cost. It is an ideal piston for automobiles and ships. alloy. However, with the increase of silicon content in the alloy, the structure of primary silicon and eutectic silicon becomes coarser, especially the structure of primary silicon and long needle-like eutectic silicon, which severely splits the alloy matrix. Moreover, the tip and corners of the silicon phase are likely to cause stress concentration, thereby significantly reducing the mechanical properties of the alloy, especially affecting the improvement of plasticity and wear resistance, and deterior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/04
Inventor 张静陈洪美金云学张艳熊永超
Owner JIANGSU UNIV OF SCI & TECH
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