A kind of magnesium alloy with lpso and/or sfs structure and its preparation method

A magnesium alloy and alloy technology, applied in the field of magnesium alloy with LPSO and/or SFs structure and its preparation, can solve the problems of accelerated matrix corrosion, no corrosion resistance performance, uneven corrosion of alloys, etc., and achieve improved corrosion resistance Performance, reduction of galvanic corrosion, uniform distribution effect

Active Publication Date: 2019-06-14
NANJING INST OF TECH
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  • Abstract
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Problems solved by technology

Mg 88 Zn 4 Y 8 Although the alloy contains the highest volume fraction of LPSO structure, it does not show the best corrosion resistance. This is mainly because the LPSO structure in the alloy accelerates the corrosion of the matrix, and the discontinuous distribution of the structure leads to the inhomogeneous corrosion of the alloy. Behavior (Journal of Materials Science and Technology, 2012, 28(12): 1157-1162.)

Method used

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  • A kind of magnesium alloy with lpso and/or sfs structure and its preparation method
  • A kind of magnesium alloy with lpso and/or sfs structure and its preparation method
  • A kind of magnesium alloy with lpso and/or sfs structure and its preparation method

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preparation example Construction

[0050] A method for preparing a magnesium alloy with LPSO and / or SFs structure, comprising the following steps in sequence:

[0051] (1) Material preparation and drying: Weigh talcum powder and sodium silicate, mix with water to make a coating, and then coat it on the inside of the casting mold and the inside of the melting crucible furnace;

[0052] Put the casting mold, pure magnesium ingot, Mg-30wt%Gd master alloy, Mg-30wt%Cu master alloy and Mg-30wt%Zr master alloy into a 200°C blast drying oven for standby; the weight of Gd and Cu is 100% content and not more than 9%;

[0053] Weigh the raw materials required for the refining agent and put them in a blast drying oven at 180 °C to keep them warm for later use;

[0054] Heat the melting furnace to 300-350 °C, and dry the crucible;

[0055] (2) Smelting: Put pure magnesium ingots in CO with a flow ratio of 90:7:3 2 , N 2 and SF 6 Melt in a smelting furnace with a ternary mixed protective gas, and the melting temperature...

Embodiment 2

[0064] Embodiment 2: Obtaining a solid solution state Mg-6.5Gd-2.5Cu-0.4Zr magnesium alloy finished product.

[0065] The solution treatment temperature was 290 °C, and the holding time was 12 hours.

[0066] In addition to the α-Mg matrix, the structure in the alloy mainly includes eutectic phase, LPSO and SFs structure, and the content of eutectic phase at the grain boundary is less than that in Example 1, while the distribution of LPSO and SFs structure is not uniform, and its volume The score is comparable to that in Example 1, about 15%.

Embodiment 3

[0068] The solution treatment temperature was 320 °C, and the holding time was 6 hours.

[0069] In addition to the α-Mg matrix, the structure in the alloy mainly includes eutectic phase, LPSO and SFs structure, and the content of eutectic phase at the grain boundary is less than that in Example 1, while the distribution of LPSO and SFs structure is not uniform, and its volume Score is more than in embodiment one, is about 19%.

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Abstract

The invention discloses a magnesium alloy with an LPSO and / or SFs structure. The magnesium alloy is characterized by being prepared from, by weight percent, 2.5% to 7.0% of Gd, 0.5% to 3.0% of Cu, 0.2% to 1.2% of Zr and the balance Mg. The sum of the weight percent content of Gd and Cu does not exceed 9%. The magnesium alloy has a cast state and a solid solution state. The solid solution state alloy has the LPSO and / or SFs structure with the volume fraction larger than 8%. By adjusting and controlling the distribution and volume fraction of the LPSO structure and the SFs structure, the corrosion rate of the magnesium alloy is effectively controlled, and the effect of even corrosion is achieved. A preparation method of the magnesium alloy is simple, easy to achieve and remarkable in effect,and the magnesium alloy can be widely applied to the industrial and biomedical aspects.

Description

technical field [0001] The invention relates to a magnesium alloy material and a preparation method thereof, in particular to a magnesium alloy with LPSO and / or SFs structure and a preparation method thereof. Background technique [0002] Magnesium and magnesium alloys have the advantages of high specific strength and specific stiffness, low density, good casting performance, good damping and vibration reduction performance, excellent cutting performance and electromagnetic shielding performance, and recyclability. In addition, magnesium is the most abundant metal element on the earth's surface including the ocean, and it is cheap. [0003] At present, magnesium alloys containing copper (Cu) elements are gradually becoming a hotspot in industrial applications and biological applications. In Mg-Cu-Zn series alloys (CN 101805864 A, CN 102051511 A), Cu can increase the eutectic temperature of Mg-Zn alloy, promote phase transformation, age hardening and solid solution strengthe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22C1/06C22F1/06
CPCC22C1/03C22C1/06C22C23/06C22F1/06
Inventor 章晓波聂豫晋戴建伟吴琼巴志新王章忠
Owner NANJING INST OF TECH
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