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Low-cost rare earth casting magnesium alloy and manufacturing method of casting thereof

A technology for casting magnesium alloys and manufacturing methods, which is applied in the field of magnesium alloys, can solve problems such as no explanations or reports, and no information has been found, and achieve the effects of low shrinkage defects and segregation tendencies, and reduced casting process difficulty

Inactive Publication Date: 2018-05-01
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is no description or report of a similar technology to the present invention, and no similar information has been searched at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The low-cost rare earth cast magnesium alloy of Mg-1.8%Y-1.1%Gd-1.1%Sm-0.4%Zr is prepared by smelting and pouring, comprising the following steps:

[0021] Step 1. Weigh pure magnesium, returned charge, Mg-Gd master alloy, Mg-Y master alloy, Mg-Sm master alloy, Mg-Zr master alloy according to the above mass percentage, and pre- Heat, treat for 8 hours;

[0022] Step 2. Melt the preheated raw materials in a crucible resistance furnace, add covering agent JDMF to cover, and refining agent RJ6 to refine, mix the alloy components evenly, remove inclusions, and cast at 710°C to obtain the original as-cast castings;

[0023] Step 3: Perform solution treatment on the obtained as-cast casting at 400°C for 300 hours and air cooling; perform aging treatment at 150°C for 100 hours and air cooling to obtain a casting blank.

[0024] After testing, the casting produced by the low-cost rare earth cast magnesium alloy obtained in this embodiment has good mechanical properties, and t...

Embodiment 2

[0026] The low-cost rare earth cast magnesium alloy of Mg-2.5%Y-0.7%Gd-1.8%Sm-0.7%Zr is prepared by smelting and pouring, comprising the following steps:

[0027] Step 1. Weigh pure magnesium, returned charge, Mg-Gd master alloy, Mg-Y master alloy, Mg-Sm master alloy, Mg-Zr master alloy according to the above mass percentage, and pre- Heat treatment for 8 hours;

[0028] S2. The raw materials after the preheating treatment are smelted in a crucible resistance furnace, covered with JDMF as a covering agent, and refined with RJ6 as a refining agent, so that the alloy components are evenly mixed, and inclusions are removed, and poured at 690°C to obtain the original as-cast castings;

[0029] Step 3. Perform solution treatment on the obtained original cast casting at 430° C. for 25 hours and air cooling; perform aging treatment at 170° C. for 75 hours and air cooling to obtain a casting blank.

[0030] After testing, the castings manufactured by the low-cost rare earth cast mag...

Embodiment 3

[0032] The low-cost rare earth cast magnesium alloy of Mg-3.2%Y-2.8%Gd-0.5%Sm-1.0%Zr prepared by smelting and casting comprises the following steps:

[0033] Step 1. Weighing pure magnesium, return charge, Mg-Gd master alloy, Mg-Y master alloy, Mg-Sm master alloy and Mg-Zr master alloy according to the above mass percentage. All raw materials were preheated at 200°C for 8 hours.

[0034] Step 2. The raw materials after the preheating treatment are smelted in a crucible resistance furnace, and the covering agent JDMF is added to cover, and the refining agent RJ6 is refined. After the alloy components are uniformly mixed, the inclusions are removed, and the casting is carried out at 680 ° C to obtain As-cast castings.

[0035] Step 3. Perform solution treatment on the obtained original cast casting at 450° C. for 20 hours and air cooling; perform aging treatment at 190° C. for 50 hours and air cooling to obtain a casting blank.

[0036] After testing, the castings manufactured...

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Abstract

The invention discloses a low-cost rare earth casting magnesium alloy and a manufacturing method of a casting thereof. The magnesium alloy is prepared from the components in percentage by weight: 1.8to 3.2 percent of Y, 0.4 to 2.2 percent of Sm, 1.0 to 2.8 percent of Gd, 0.4 to 1.0 percent of Zr, and the balance Mg, wherein the sum of the mass percent of the Y, the Gd and the Sm is between 4.0 and 6.5 percent. Compared with the prior art, the rare earth magnesium alloy adopts cheap rare earth elements, is low in total rare earth content, and has a certain ageing strengthening capacity; meanwhile, during a casting process, a formation tendency of various metallurgical defects is low; and compared with other rare earth casting magnesium alloys, the manufactured casting has the advantages oflow raw material and process cost, high yield and high performance cost ratio.

Description

technical field [0001] The invention relates to a magnesium alloy in the technical field of metal materials, in particular to a low-cost rare earth cast magnesium alloy and a manufacturing method thereof. Background technique [0002] Magnesium alloys have the advantages of low density and high specific strength, and are widely used in aerospace, military and various industrial fields. Cast magnesium alloys are suitable for liquid forming and can be used to manufacture complex thin-walled components. Among the existing cast magnesium alloys at home and abroad, they can be divided into aluminum-containing cast magnesium alloys and zirconium-containing cast magnesium alloys. In order to achieve certain mechanical properties, aluminum-containing cast magnesium alloys generally use high aluminum content, wide solidification interval, tendency to form micro-shrinkage and reverse segregation, poor casting processability, and high process cost for manufacturing large complex thin-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/06C22F1/06C22C1/03
CPCC22C23/06C22C1/03C22C1/06C22F1/06
Inventor 肖旅杨力祥王先飞陈舸李中权袁勇李宝辉田莹孔振邹文兵
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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