Preparation method for adjusting and controlling high-toughness magnesium alloy containing fine LPSO structure through spark plasma sintering

A discharge plasma, tough magnesium alloy technology, applied in the field of non-ferrous metal alloy preparation, can solve the problems of limited mechanical properties, coarse grains, and no fine LPSO structure can be prepared, and achieve good mechanical properties, high repeatability, and fine grains. Effect

Active Publication Date: 2018-12-07
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation of magnesium alloys by spark plasma sintering gold is limited to common pure magnesium powder ([2]Cheng Y,Cui Z,Cheng L,et al.Effect of particle size on densification of pure magnesium during spark plasma sintering[J].Advanced Powder Technology,2017,28(4):1129-1135), AZ series powders ([3]Mondet M, Barraud E, Lemonnier S, et al.Microstructure and mechanical properties of AZ91magnesium alloy developed by Spark PlasmaSintering[J].Acta Materialia, 2016,119:55-67) most of the prepared products have coarse grains and limited mechanical properties
In addition, no small LPSO structure was prepared in the above literature [1-3]

Method used

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  • Preparation method for adjusting and controlling high-toughness magnesium alloy containing fine LPSO structure through spark plasma sintering
  • Preparation method for adjusting and controlling high-toughness magnesium alloy containing fine LPSO structure through spark plasma sintering
  • Preparation method for adjusting and controlling high-toughness magnesium alloy containing fine LPSO structure through spark plasma sintering

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Experimental program
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Embodiment 1

[0035] This embodiment provides a method for preparing a high-strength and tough magnesium alloy containing a fine LPSO structure controlled by spark plasma sintering. The following steps are specifically adopted:

[0036] 1) Mg-2.5Gd-1Zn (atomic percentage) alloy powder is prepared by atomization powder making, and the alloy powder is classified, and the alloy powder with a particle size of 325 mesh and a particle size of less than 45um is selected and loaded into a graphite mold.

[0037] 2) After the powder is pre-pressed, the spark plasma sintering furnace (such asfigure 1 ) for sintering. The sintering temperature of the spark plasma sintering process is 450°C, and the vacuum degree of the sintering furnace chamber is 2.5×10 -3 Below Pa, it is advisable to apply a pressure of 30MPa, a holding time of 5min, and a heating rate of 20°C / min. The block obtained after sintering is magnesium rare earth alloy.

[0038] 3) The alloy is subjected to aging treatment at a temperatu...

Embodiment 2

[0041] This embodiment provides a method for preparing a high-strength and tough magnesium alloy containing a fine LPSO structure controlled by spark plasma sintering. The following steps are specifically adopted:

[0042] 1) Prepare the Mg-2.5Gd-0.5Zn-0.18Zr (atomic percentage) alloy powder by atomization powder making, and classify the alloy powder, select the alloy powder with 325 mesh and particle size less than 45um and put it into the graphite mold .

[0043] 2) After the powder is pre-pressed, it is sintered in a spark plasma sintering furnace. The sintering temperature of the spark plasma sintering process is 480°C, and the vacuum degree of the sintering furnace chamber is 2.5×10 -3 Below Pa, the pressure should be 30MPa, the holding time should be 8min, and the heating rate should be 30℃ / min. The block obtained after sintering is magnesium rare earth alloy.

[0044] 3) The alloy is subjected to aging treatment at a temperature of 200° C. for 64 hours.

[0045] The...

Embodiment 3

[0047] This embodiment provides a method for preparing a high-strength and tough magnesium alloy containing a fine LPSO structure controlled by spark plasma sintering. The following steps are specifically adopted:

[0048] 1) Prepare the Mg-2Gd-0.5Y-1Zn-0.18Mn (atomic percentage) alloy powder by atomization powder making, and classify the alloy powder, select the alloy powder with 325 mesh and particle size less than 45um and put it into the graphite mold middle.

[0049] 2) After the powder is pre-pressed, it is sintered in a spark plasma sintering furnace. The sintering temperature of the spark plasma sintering process is 500°C, and the vacuum degree of the sintering furnace chamber is 2.5×10 -3 Pa, the applied pressure is 50MPa, the holding time is 10min, and the heating rate is 20℃ / min. The block obtained after sintering is magnesium rare earth alloy.

[0050] 3) The alloy is subjected to aging treatment at a temperature of 225° C. for 32 hours.

[0051] The alloy can ...

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Abstract

The invention provides a preparation method for adjusting and controlling a high-toughness magnesium alloy containing a fine LPSO structure through spark plasma sintering. The preparation method comprises the following steps: A, Mg-RE-Zn-Zr/Mn alloy powder is prepared through atomizing powder; B, the Mg-RE-Zn-Zr/Mn alloy powder is subject to the spark plasma sintering to obtain the high-toughnessmagnesium alloy with the fine LPSO structure; and C, aging treatment is carried out on the magnesium alloy prepared in the step B. According to the preparation method, the pressure, temperature, timeand heating rate of the spark plasma sintering are regulated and controlled, the tissue of the alloy is regulated and controlled, and compared with an existing magnesium alloy forming mode, the forming temperature of the method is low, the forming speed is high, the tissue of products can be regulated and controlled, the crystal grain is small, the LPSO structure is fine, and therefore the mechanical property is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of non-ferrous metal alloys, in particular to a method for preparing a high-strength and tough magnesium alloy containing a fine LPSO structure controlled by spark plasma sintering. Background technique [0002] Due to the advantages of low density, high specific strength and specific stiffness, magnesium alloys have been widely used in automotive, aerospace, military and other fields. But the current weak strength of magnesium alloy is the main reason that limits its wide application. Among the many systems of magnesium alloys, Mg-RE alloys have stronger solid solution strengthening and precipitation strengthening effects than magnesium alloys without RE, so that they have greater room for strength improvement. The strength of the developed Mg-RE series alloys far exceeds that of traditional Mg-Al alloys. A new type of long period stacking order structure (Long Period Stacking Order Structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/06C22C1/04
CPCC22C1/0408C22C23/00C22C23/06
Inventor 吴玉娟罗远航彭立明宿宁陈娟郑飞燕赵倩衡相文丁文江
Owner SHANGHAI JIAO TONG UNIV
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