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Preparation method of Mg-Ce-Mn-Sc heat-resistant magnesium alloy

A mg-ce-mn-sc, magnesium alloy technology, applied in the field of heat-resistant magnesium alloys, can solve the problems of high energy consumption, unfavorable high-temperature creep resistance of heat-resistant magnesium alloys, and high eutectic phase stability, and achieve fine It has obvious chemical effect, good room temperature/high temperature tensile properties, and improved mechanical properties.

Active Publication Date: 2018-01-12
CHONGQING UNIV OF TECH
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Problems solved by technology

However, there are also studies that [1-EmleyE.F.Principles of Magnesium Technology, Pergamon, Oxford, 1966, pp.127-155; 2-Bamberger M, Dehm G.Trends in the development of new Mg alloys[J].AnnualReview Mater.Res.,2008,38:505-533], adding Zr to Mn-containing magnesium alloys, Zr and Mn will form compounds such as MnZr2, resulting in no obvious grain refinement effect of Zr on Mn-containing magnesium alloys
Obviously, there is still a lot of controversy about whether adding Zr to the Mg-Ce-Mn-Sc heat-resistant magnesium alloy can refine the grains of the alloy, but no matter whether there is a refining effect, one thing is certain, That is, according to the calculation of the phase diagram, after Zr is added to the Mg-Ce-Mn-Sc quaternary heat-resistant magnesium alloy, Zr and Mn will form MnZr 2 Compound thus consumes Mn and ultimately affects Mn 2 The formation of Sc phase and reduce its number, which is obviously detrimental to the high temperature creep resistance of Mg-Ce-Mn-Sc heat-resistant magnesium alloys
As for heat treatment strengthening, considering that the solid solubility of Sc in Mg is high, the maximum solid solubility is 25.9%, while the solid solubility of Ce in Mg is very low, the maximum solid solubility is 1.9%, and the Mg formed in the alloy structure 12 The Ce eutectic phase has high stability, and it is difficult to decompose and dissolve the Mg12Ce eutectic phase into the matrix by traditional solution treatment methods. Therefore, the heat treatment strengthening of Mg-Ce-Mn-Sc heat-resistant magnesium alloys is mainly from the perspective of T5 aging treatment. Considered from the perspective of solid solution + aging treatment, it is basically not involved
Moreover, the existing solution treatment of magnesium alloys is carried out under the condition of reheating to the solution treatment temperature after the alloy casting is cooled to room temperature; this traditional solution treatment method has problems such as long heating and holding time, and large energy consumption; in addition , It is also necessary to strictly control the process factors such as heating method and heating speed, because once the heating method and heating speed are selected improperly, uneven heating will occur, making it difficult to achieve the purpose of solid solution treatment, and even cause defects such as overburning of the alloy in severe cases. and ultimately lead to the comprehensive mechanical properties of the alloy being affected
Obviously, the T5 aging treatment strengthening of Mg-Ce-Mn-Sc heat-resistant magnesium alloy can only make the role of Sc be brought into play, while the role of Ce is basically not reflected.

Method used

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  • Preparation method of Mg-Ce-Mn-Sc heat-resistant magnesium alloy
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  • Preparation method of Mg-Ce-Mn-Sc heat-resistant magnesium alloy

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Embodiment 1

[0029] Embodiment 1, a kind of preparation method of Mg-Ce-Mn-Sc heat-resistant magnesium alloy, it comprises the following steps:

[0030] Step 1, batching, prepare the Mg-3Ce-1.2Mn-0.9Sc magnesium alloy according to the composition of 94.86wt.%Mg, 3wt.%Ce, 1.2wt.%Mn and 0.9wt.%Sc, wherein Mg has a purity>99.99 wt.% was added in the form of industrially pure Mg, Ce, Mn and Sc were added in the form of Mg-29wt.%Ce, Mg-4wt.%Mn and Mg-3wt.%Sc master alloys, and pure Mg, Mg-29wt. %Ce, Mg-4wt.%Mn and Mg-3wt.%Sc master alloys are preheated;

[0031] Step 2, smelting, under the protection of flux or gas, when the temperature of the furnace reaches 250°C, add preheated pure Mg and Mg-4wt.%Mn master alloy and melt them, and heat up to 740°C after melting, and then Add the preheated Mg-29wt.%Ce and Mg-3wt.%Sc master alloys, stir the alloy melt to 760°C after these master alloys melt, remove the scum on the surface of the alloy liquid, and then Treat it with refining agent for 8 minut...

Embodiment 2

[0034] Embodiment two, a kind of preparation method of Mg-Ce-Mn-Sc heat-resistant magnesium alloy, it comprises the following steps:

[0035] Step 1, batching, prepare the Mg-4Ce-1.1Mn-0.8Sc magnesium alloy according to the composition of 94.26wt.%Mg, 4wt.%Ce, 1.1wt.%Mn and 0.8wt.%Sc, wherein Mg has a purity of >99.99% wt.% was added in the form of industrially pure Mg, Ce, Mn and Sc were added in the form of Mg-29wt.%Ce, Mg-4wt.%Mn and Mg-3wt.%Sc master alloys, and pure Mg, Mg-29wt. %Ce, Mg-4wt.%Mn and Mg-3wt.%Sc master alloys are preheated;

[0036] Step 2, smelting, under the protection of flux or gas, when the temperature of the furnace reaches 200°C, add preheated pure Mg and Mg-4wt.%Mn master alloy and melt them, and heat up to 720°C after melting, and then Add the preheated Mg-29wt.%Ce and Mg-3wt.%Sc master alloys. After these master alloys are melted, stir the alloy melt and raise the temperature to 740°C, remove the scum on the surface of the alloy liquid, and then ...

Embodiment 3

[0039] Embodiment three, a kind of preparation method of Mg-Ce-Mn-Sc heat-resistant magnesium alloy, it comprises the following steps:

[0040] Step 1, batching, prepare the Mg-5Ce-1.0Mn-0.7Sc magnesium alloy according to the composition of 93.06wt.%Mg, 5wt.%Ce, 1.0wt.%Mn and 0.7wt.%Sc, wherein Mg has a purity of >99.99% wt.% was added in the form of industrially pure Mg, Ce, Mn and Sc were added in the form of Mg-29wt.%Ce, Mg-4wt.%Mn and Mg-3wt.%Sc master alloys, and pure Mg, Mg-29wt. %Ce, Mg-4wt.%Mn and Mg-3wt.%Sc master alloys are preheated;

[0041] Step 2, smelting, under the protection of flux or gas, when the temperature of the furnace reaches 200°C, add preheated pure Mg and Mg-4wt.%Mn master alloy and melt them, and heat up to 720°C after melting, and then Add the preheated Mg-29wt.%Ce and Mg-3wt.%Sc master alloys. After these master alloys are melted, stir the alloy melt and raise the temperature to 740°C, remove the scum on the surface of the alloy liquid, and then...

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Abstract

The invention discloses a preparation method of Mg-Ce-Mn-Sc heat-resistant magnesium alloy. The preparation method comprises the following steps of 1 material mixing, 2 smelting, 3 solution treatmentand 4 aging treatment. According to the preparation method, grains of the Mg-Ce-Mn-Sc heat-resistant magnesium alloy can be significantly refined, the microscopic structure of the Mg-Ce-Mn-Sc heat-resistant magnesium alloy can be significantly improved, the tensile property and the 300-DEG C high-temperature creep resistance of the alloy are improved, and the application range of the alloy is widened.

Description

technical field [0001] The invention relates to a heat-resistant magnesium alloy, in particular to a preparation method of a Mg-Ce-Mn-Sc heat-resistant magnesium alloy. Background technique [0002] As the lightest commercial metal engineering structural material, magnesium alloy is known as the "21st century" because of its light specific gravity, high specific strength and specific stiffness, strong damping and vibration reduction, excellent liquid forming performance and easy recycling. Green Structural Materials". However, at present, due to the poor high-temperature creep resistance of existing magnesium alloys, the long-term working temperature cannot exceed 120°C, making it impossible to be used in the manufacture of automotive engines and other transmission parts that require high-temperature creep performance, thus greatly hindering the development of magnesium alloys. The further promotion and application of the alloy. It is precisely because of this that the res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C1/06C22C23/06C22F1/06
Inventor 杨明波沈威武刘婧林翰钟罗喜肖竞潘复生
Owner CHONGQING UNIV OF TECH
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