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Refining method of Mg2Si phase in Mg-Al-Si series alloy

A mg-al-si and alloy technology, applied in the field of metal materials, can solve the problems of plasticity decline in mechanical properties of alloys, and achieve the effect of improving strength and plasticity

Inactive Publication Date: 2019-11-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the AS52 series alloy that exists in the above-mentioned prior art and easily form thick Chinese character shape Mg 2 Si phase, which makes the mechanical properties of the alloy, especially the plasticity, etc. insufficient, providing a Mg-Al-Si alloy in Mg 2 Refining method of Si phase

Method used

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  • Refining method of Mg2Si phase in Mg-Al-Si series alloy
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  • Refining method of Mg2Si phase in Mg-Al-Si series alloy

Examples

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Effect test

Embodiment 1

[0033] Taking 10kg as an example, prepare a cast magnesium alloy according to the ratio of Mg-5Al-2Si-0.1Ce (that is, the composition content of the magnesium alloy is: 5% Al, 2% Si, 0.1% Ce, and the rest is Mg and unavoidable impurities) . Specific steps are as follows:

[0034] (1) The Mg-5Al-2Si alloy ingot is melted in a crucible furnace at 690° C. according to the conventional magnesium alloy smelting method;

[0035] (2) Inoculation and modification treatment: when the temperature of the melt rises to 765°C, quickly add the Mg-Ce master alloy into the metal melt to reduce the burning loss of the Ce element, and keep it warm for 25 minutes to ensure that all the added Mg-Ce alloy is melt;

[0036] (3) Stirring and slag removal: keep the temperature of the molten metal at 745°C, and stir the molten metal clockwise from top to bottom twice every 10 minutes. Stirring should be uniform and efficient to ensure that all the added intermediate alloys are melted , and the Ce e...

Embodiment 2

[0040] Taking 10kg as an example, prepare a cast magnesium alloy according to the ratio of Mg-5Al-2Si-0.4Ce (that is, the composition content of the magnesium alloy is: 5% Al, 2% Si, 0.4% Ce, and the rest is Mg and unavoidable impurities) ; Concrete steps are with embodiment 1.

[0041] In the cast magnesium alloy of this embodiment, Chinese character-shaped Mg 2 Si phase length is about 50μm, polygonal shape Mg 2 The Si phase is about 8 μm; at room temperature (25°C), the yield strength is 76MPa, the tensile strength is 133MPa, and the plasticity is 2.6%; at 150°C, the yield strength is 85MPa, the tensile strength is 128MPa, and the plasticity is 7.5%; at 200°C, the yield strength is 78MPa, Tensile strength 101MPa, plasticity 5.8%.

Embodiment 3

[0043] Taking 10kg as an example, prepare a cast magnesium alloy according to the ratio of Mg-5Al-2Si-0.8Ce (that is, the composition content of the magnesium alloy is: 5% Al, 2% Si, 0.8% Ce, and the rest is Mg and unavoidable impurities) ; Concrete steps are with embodiment 1.

[0044] In the cast magnesium alloy of this embodiment, Chinese character-shaped Mg 2 Si phase length is about 30μm, polygonal shape Mg 2 The Si phase is about 3 μm; at room temperature (25°C), the yield strength is 61MPa, the tensile strength is 122MPa, and the plasticity is 3.3%; at 150°C, the yield strength is 72MPa, the tensile strength is 108MPa, and the plasticity is 10.1%; at 200°C, the yield strength is 70MPa, The tensile strength is 83MPa, and the plasticity is 8.7%.

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Abstract

The invention discloses a refining method of a Mg2Si phase in an Mg-Al-Si series alloy. In the smelting process of the Mg-Al-Si series alloy, 0.1%-0.8% of the Ce element is added in the form of an Mg-Ce intermediate alloy within a required temperature range, inoculation and modification treatment is performed for a certain time duration, and the Mg2Si phase separated out after the Mg-Al-Si seriesalloy is solidified is effectively refined. By means of the refining method provided by the invention, the mechanical performance of a material under the room temperature and a high temperature is improved, and the strength and plasticity of the alloy are obviously improved; and an Mg-Al-Si-Ce alloy prepared needs no subsequent heat treatment, the coarse Mg2Si phase in the alloy is modified, the size is remarkably decreased, the tensile strength reaches up to 134 MPa and the plasticity is 3.3% under the room temperature, the tensile strength reaches up to 128 MPa and the plasticity is 10.1% atthe temperature of 150 DEG C, and the tensile strength reaches up to 101 MPa and the plasticity is 8.7% at the temperature of 200 DEG C.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to Mg in a Mg-Al-Si alloy 2 Si phase refinement method. Background technique [0002] Magnesium alloy is the lightest metal structural material. Due to its low density, high specific strength and specific stiffness, good machinability and casting properties, it has great application potential in the automotive and aerospace industries in recent years. With the development of lightweight in the automotive and communication industries, new materials and new processes for automotive lightweight will be the future demand. Lightweight new materials are the main means of lightweighting, and safety is the premise of lightweighting. While people are optimizing the traditional structure, they also put forward higher requirements for the performance of magnesium alloy materials. Magnesium alloys are required to have relatively High strength and plasticity, also need to have better heat resis...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C23/02
CPCC22C1/03C22C23/02
Inventor 李德江朱文杰曾小勤应韬
Owner SHANGHAI JIAO TONG UNIV
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