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A method for modifying LPSO structure in magnesium alloy by native nano-dispersed phase

A disperse phase, magnesium alloy technology, applied in the field of non-ferrous metal alloy preparation, can solve the problems of lack of second phase particle pinning, high temperature thermal stability to be verified and other problems, achieve good application prospects, significant strengthening effect, overcome weak binding force Effect

Active Publication Date: 2021-10-15
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, with the further research on the structure and properties of LPSO, it was found that the LPSO-type Mg-RE alloys still have the following two main problems: On the one hand, the LPSO structure itself is still a metal-type compound, and its deformation is still based on the basic Kink mechanism dominated by dislocation slip movement, and has strong anisotropy
However, such small-sized LPSO grains only appear at local recrystallization sites, and most of the grain sizes are still in the micron scale
In addition, due to the lack of second-phase particle pinning inside and on the grain boundaries of the LPSO structure, its high-temperature thermal stability remains to be verified.

Method used

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  • A method for modifying LPSO structure in magnesium alloy by native nano-dispersed phase
  • A method for modifying LPSO structure in magnesium alloy by native nano-dispersed phase
  • A method for modifying LPSO structure in magnesium alloy by native nano-dispersed phase

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Embodiment 1

[0045] In this embodiment, a method for modifying the LPSO structure in the original nanometer dispersed phase in the magnesium alloy is carried out according to the following steps:

[0046] (1) Preparation of LPSO pre-alloyed powder: LPSO alloy ingots were prepared by conventional magnesium alloy melting method, and the whole process was carried out in CO 2 with SF 6 Carried out under a mixed gas atmosphere, the main steps are as follows: according to the mass ratio of Mg: Zn: Y = 63.4: 12.0: 24.6 for batching; preheat the melting furnace to 400 ~ 500 ° C, and then add pure magnesium ingots to the crucible of the melting furnace In the middle, reheat to 700-750°C; after the magnesium ingot is melted, add Zn and Mg-Y intermediate alloys, then raise the furnace temperature by 10-30°C, keep it warm for 10-15 minutes, and then mechanically stir for 2-5 minutes; put the melting furnace Adjust the temperature to 700-720°C, keep it warm for 10-15 minutes, pour it into the mold, an...

Embodiment 2

[0050] In this embodiment, a method for modifying the LPSO structure in the original nanometer dispersed phase in the magnesium alloy is carried out according to the following steps:

[0051] (1) The first step of this embodiment is the same as step (1) in embodiment 1.

[0052] (2) Mechanical alloying and oxygen doping treatment: perform mechanical alloying and oxygen doping treatment on the pre-alloyed powder by an air oxidation method. The pre-alloyed powder was ultrasonically cleaned in alcohol for 10 min, and then dried in a vacuum oven. The drying temperature is 150°C, and the drying time is 5h. Weigh 5g of dried pre-alloyed powder, together with 10g of grinding steel balls, put it into a 50ml ball mill jar in air and seal it for mechanical alloying. The parameters of mechanical alloying are ball-to-material ratio of 2:1, rotation speed of 1000rpm, and scraping once every 0.5h of ball mill shutdown. The scraping of the first three shutdowns is carried out in the air, an...

Embodiment 3

[0056] In this embodiment, a method for modifying the LPSO structure in the original nanometer dispersed phase in the magnesium alloy is carried out according to the following steps:

[0057] (1) The first step of this embodiment is the same as step (1) in embodiment 1.

[0058] (2) Mechanical alloying and oxygen doping treatment: perform mechanical alloying and oxygen doping treatment on the pre-alloyed powder by magnesium oxide decomposition method. The pre-alloyed powder was ultrasonically cleaned in alcohol for 10 min, and then dried in a vacuum oven. The drying temperature is 150°C, and the drying time is 5h. The mixture powder is configured according to the proportion of MgO mass fraction being 5%, 5 g in total. Among them, LPSO pre-alloyed powder 4.75g, MgO powder 0.25g. Put the prepared mixture powder together with 10 g of grinding steel balls into a 50 ml ball mill jar in a glove box and seal it for mechanical alloying. The parameters of mechanical alloying are ba...

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Abstract

The invention provides a method for modifying the LPSO structure in a primary nano-dispersed phase in a magnesium alloy, which belongs to the technical field of non-ferrous metal alloy preparation and comprises the following steps: preparing an LPSO alloy ingot by a conventional magnesium alloy smelting method, and then processing the LPSO alloy ingot into fine debris to obtain LPSO pre-alloyed powder; perform mechanical alloying and oxygen doping treatment on LPSO pre-alloyed powder by air oxidation method or magnesium oxide decomposition method to obtain magnesium alloy precursor powder with oxygen solid solution; then cold press the precursor powder After sintering and molding, the LPSO structure alloy modified by the original nano-dispersed phase is obtained. The invention innovatively introduces an oxide nano-dispersed phase with an ultra-high melting point in situ into the LPSO structure, thereby realizing the modification of the non-heat-treatable LPSO structure. At the same time, the prepared LPSO has fine grain size and high thermal stability. The technology adopted in the invention is simple, the equipment environment requirements are low, the prepared material has excellent mechanical properties, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of preparation of nonferrous metal alloys, in particular to a method for modifying the LPSO structure in a magnesium alloy by an original nanometer dispersed phase. Background technique [0002] As the lightest metal structural material, magnesium alloy has broad application prospects in the field of lightweight. However, the disadvantages of traditional magnesium alloys, such as low absolute strength and poor heat resistance, severely limit its promotion and use in various fields. For example, when the service temperature of the traditional Mg-Al alloy exceeds 120°C, the strength drops sharply, mainly because there is a large amount of Mg in the alloy. 17 Al 12 Low melting point precipitated phase. Rare earth magnesium alloys (Mg-RE series) are typical representatives of high-strength and heat-resistant magnesium alloys in the existing magnesium alloy system. Rare earth elements are added to the existin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/04C22C1/10B22F9/04B22F3/02B22F3/105B22F3/14
CPCB22F3/02B22F3/105B22F3/14B22F9/04B22F2003/1051B22F2009/041B22F2009/043C22C1/1084C22C23/06
Inventor 蔡学成沈同德许利东丁帅军宋健刘永
Owner YANSHAN UNIV
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