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Modification design and preparation method of Mg-Al-Ca magnesium alloy for in-situ generation of Al8Mn4Gd phase

A mg-al-ca, in-situ generation technology is applied in the field of modification design and preparation of Mg-Al-Ca magnesium alloys in which Al8Mn4Gd phase is generated in-situ, and can solve the application limitations of AE-series magnesium alloys, expensive rare earth metals, Reduce the mechanical properties of magnesium alloys, and achieve the effects of up to ductility, up to rolling deformation rate, and up to tensile strength

Inactive Publication Date: 2020-09-22
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the AE series magnesium alloys are only suitable for die-casting production with a faster cooling rate, because the slower cooling rate will lead to coarse Al 2 Formation of RE compounds, thereby reducing the mechanical properties of magnesium alloys【Zhang J, Zhang M, Materials Science and Engineering A 2010,527:2527- 2537】
On the other hand, due to the relatively expensive rare earth metals, the application of AE magnesium alloys in the automotive industry and power system fields is greatly limited [Pan F, Journal of Materials Science and Technology, 2016,32(12):1211-1221]

Method used

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  • Modification design and preparation method of Mg-Al-Ca magnesium alloy for in-situ generation of Al8Mn4Gd phase
  • Modification design and preparation method of Mg-Al-Ca magnesium alloy for in-situ generation of Al8Mn4Gd phase
  • Modification design and preparation method of Mg-Al-Ca magnesium alloy for in-situ generation of Al8Mn4Gd phase

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Embodiment 1

[0028] 1. According to the mass percentage of alloying elements: aluminum: 5.919%, manganese: 0.527%, calcium: 4.008%, gadolinium: 0.377%, and the rest is magnesium. Weigh the required pure magnesium, pure aluminum, aluminum-10% manganese or magnesium -10% manganese master alloy, aluminum-5% gadolinium or magnesium-5% gadolinium master alloy, pure calcium or magnesium-10% calcium master alloy, pure antimony; coat the bottom of the crucible with boron nitride, add pure magnesium ingots, and then Add the required aluminum ingot on top of the magnesium ingot, under the influence of CO 2 and SF 6 Heating and melting under the protection of mixed gas; adding the above-mentioned content and preheated magnesium-5% gadolinium master alloy into the melt; adding the preheated aluminum-manganese master alloy into the melt, stirring evenly, to remove iron and Silicon impurities; add the above-mentioned content and preheated magnesium-10% calcium master alloy into the melt, keep the tempe...

Embodiment 2

[0030] 1. According to the mass percentage of alloy elements: aluminum: 5.919%, manganese: 0.527%, calcium: 4.008%, gadolinium: 0.377%, zinc: 0.9%, and the rest is magnesium. Weigh the required pure zinc, pure magnesium, pure aluminum , aluminum-10% manganese or magnesium-10% manganese master alloy, aluminum-5% gadolinium or magnesium-5% gadolinium master alloy, pure calcium or magnesium-10% calcium master alloy, pure antimony; the bottom of the crucible is coated with boron nitride , add pure magnesium ingots, and then add the required aluminum ingots on top of the magnesium ingots, under CO 2 and SF 6Heating and melting under the protection of mixed gas; adding the above-mentioned content and preheated magnesium-5% gadolinium master alloy into the melt; adding the preheated pure zinc and aluminum-manganese master alloy into the melt, stirring evenly, and carrying out Remove iron and silicon impurities; add the above content and preheated magnesium-10% calcium master alloy i...

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Abstract

The invention discloses a modification design and a preparation method of an Mg-Al-Ca magnesium alloy for in-situ generation of an Al8Mn4Gd phase. Based on heterogeneous nucleation and modification treatment mechanisms, the content of calcium and gadolinium is regulated and controlled, and the nucleation and growth process of an Al2Ca phase is controlled through the Al8Mn4Gd phase generated firstly, so that a novel heat-resistant high-strength Mg-Al-Ca magnesium alloy suitable for casting and deformation working conditions is successfully developed. The technical scheme of the invention is asfollows: a magnesium ingot and aluminum needing to be added are molten together; the gadolinium element is added before the manganese element; a magnesium-gadolinium intermediate alloy is added to introduce gadolinium; after stirring, aluminum-manganese or a magnesium-manganese intermediate alloy is added to introduce manganese for removing iron and silicon impurities; the element calcium needingto be added or a magnesium-calcium intermediate alloy is added to introduce calcium for refining treatment; after standing and heat preservation, a melt is directly cast into a cast ingot; or the castingot is cast firstly, and then is extruded and rolled into a thin plate.

Description

technical field [0001] The invention relates to an in-situ Al 8 mn 4 Modification design and preparation method of Mg-Al-Ca magnesium alloy with Gd phase Background technique [0002] Magnesium alloy is the lightest metal structure material in the world, and has important application value and broad development prospects in the competitive field of lightweight and low emission in the automotive industry【Joost W J, Scripta Materialia, 2017,128:107-112.】 . However, the absolute strength of magnesium alloy is low, especially the poor high temperature performance, which limits its application in engine and transmission parts, but this type of parts plays a pivotal role in reducing the weight of the whole vehicle [4] . Therefore, the development of high-performance heat-resistant magnesium alloys and the research on their creep rupture mechanism have strong application prospects and urgent needs [Wen Lihua, Light Alloy Processing Technology, 2016,44(9):7-11]. [0003] The de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 于文波马超胜黄振莺李翠伟李世波周洋
Owner BEIJING JIAOTONG UNIV