Mg-Gd alloy with low Gd content and preparation and heat treatment method thereof

A heat treatment method and mg-gd technology, applied in the field of magnesium alloys, can solve the problems of easy segregation of Gd content, increase the density of magnesium alloys, low Gd content, etc., and achieve the effects of improving comprehensive mechanical properties, not easy to segregate, and improving mechanical properties.

Active Publication Date: 2021-09-17
CHONGQING UNIV OF ARTS & SCI
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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems of high Gd content in the existing Mg-Gd alloys, which are prone to segregation, increase the density of magnesium alloys and high cost, and provide a Mg-Gd alloy with a low Gd content. Gd alloy

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  • Mg-Gd alloy with low Gd content and preparation and heat treatment method thereof
  • Mg-Gd alloy with low Gd content and preparation and heat treatment method thereof
  • Mg-Gd alloy with low Gd content and preparation and heat treatment method thereof

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Effect test

Embodiment 1

[0033] 1. Preparation of Mg-Gd alloy

[0034] According to the batching of Mg-3%Gd-3%Li-2%Y-1%Nd-0.4%Zr (mass fraction), after the surface is polished, add it to the preheated resistance furnace, and pass it into SF 6 + CO 2 The mixed gas is used as protection, and the temperature is gradually raised to 760°C. After all the charge in the crucible is melted, refine for 2~4 minutes. The temperature is controlled at 720°C, and the alloy is poured after standing in the furnace for 25-30 minutes. After the ingot is cooled in the mold, the mold is opened and taken out.

[0035] The metallographic structure of the as-cast magnesium alloy that present embodiment makes is as follows figure 1 shown. figure 1 Among them, the brighter part is the matrix Mg phase, the grains are in the dendrite state, and the contrast at the grain boundary is darker, which is the second phase. Carry out X-ray diffraction analysis to sample, the result sees figure 2 , the phase composition of the a...

Embodiment 2

[0042] 1. Preparation of Mg-Gd alloy

[0043] Dosing according to the composition Mg-4%Gd-3%Li-3%Y-2%Nd-0.4%Zr (mass fraction), after the surface is polished clean, put it into the preheated resistance furnace, and pass it into SF 6 + CO 2 The mixed gas is used as protection, and the temperature is gradually raised to 760°C. After all the charge in the crucible is melted, refine for 2~4 minutes. The temperature is controlled at 720°C, and the alloy is poured after standing in the furnace for 25-30 minutes. After the ingot is cooled in the mold, the mold is opened and taken out.

[0044] 2. Heat treatment of Mg-Gd alloy

[0045]Embed the prepared magnesium alloy in a stainless steel crucible with graphite, put the crucible in a muffle furnace, raise the temperature from room temperature to 500°C, the heating rate is 1°C / min, and carry out heat preservation after reaching the set temperature of 500°C. The time is 4 h. After the heat preservation is completed, the power is ...

Embodiment 3

[0050] 1. Preparation of Mg-Gd alloy

[0051] Dosing according to the composition Mg-3%Gd-2%Li-2%Y-2%Nd-0.3%Zr (mass fraction), after the surface is polished clean, put it into the preheated resistance furnace, and pass it into SF 6 + CO 2 The mixed gas is used as protection, and the temperature is gradually raised to 760°C. After all the charge in the crucible is melted, refine for 2~4 minutes. The temperature is controlled at 720°C, and the alloy is poured after standing in the furnace for 25-30 minutes. After the ingot is cooled in the mold, the mold is opened and taken out.

[0052] 2. Heat treatment of Mg-Gd alloy

[0053] Embed the prepared magnesium alloy in a stainless steel crucible with graphite, put the crucible in a muffle furnace, raise the temperature from room temperature to 500°C, the heating rate is 1°C / min, and carry out heat preservation after reaching the set temperature of 500°C. The time is 3 h. After the heat preservation is completed, the power is...

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Abstract

The invention discloses a low-Gd-content Mg-Gd alloy and a preparation and heat treatment method thereof. The Mg-Gd alloy with the low Gd content is prepared from the following chemical components in percentage by mass: 2-5% of Gd, 2-5% of Li, 1-3% of Y, 1-2% of Nd, 0.2-0.6% of Zr and the balance of magnesium and inevitable impurities. The preparation method comprises the following steps of S1, preparing materials according to the proportion of the Mg-Gd alloy with the low Gd content; and S2, under the protection of SF6+CO2 gas, melting the alloy material in a resistance furnace and then refining for 2-4 minutes, then standing for 25-30 minutes in the resistance furnace and then casting into a metal mold to obtain a casting. The heat treatment method comprises the steps that the casting is put into a crucible, the crucible is put into a muffle furnace, the temperature is increased to 480-500 DEG C, then heat preservation treatment is conducted, and the heat preservation time is 2-4 hours; and after heat preservation is completed, the crucible is taken out and immediately quenched in water, and heat treatment is completed. The Li in the solid solution state is used for promoting the formation of an MgGd phase under the condition of low alloy content, and the content of Gd in the Mg-Gd alloy is reduced.

Description

technical field [0001] The invention relates to the technical field of magnesium alloys, in particular to a Mg-Gd alloy with low Gd content and a preparation and heat treatment method thereof. Background technique [0002] As the structural material with the lowest density at present, magnesium alloy has the advantages of high specific strength and specific stiffness, good heat dissipation and shock absorption, abundant raw materials and recyclable utilization, etc., and has great potential for development. Among the currently developed high-strength magnesium alloys, Mg-Gd alloys account for a relatively high proportion. The strengthening effect of Gd element in magnesium alloy is mainly realized through the formation of MgGd strengthening phase. According to the phase diagram of the Mg-Gd binary alloy, the maximum solid solubility of Gd element in the magnesium matrix can reach 23.3% (mass percentage). In the Mg-Gd binary alloy, usually the Gd content should be more than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C23/00C22F1/06C22C1/03C21D9/00
CPCC22C23/06C22C23/00C22C1/03C22F1/002C22F1/06C21D9/0075Y02E30/30
Inventor 陈巧旺姜山邓莹周武中陶鹭王志飞张羽翔李佳颖陈琳
Owner CHONGQING UNIV OF ARTS & SCI
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