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Heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy, heat-resistant technology, applied in the field of new material preparation, can solve the problem that the alloy is not suitable for large-scale commercial use, achieve high market value, improve heat resistance, and reduce costs

Active Publication Date: 2021-01-15
西安弘如材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, alloys with high cost are not suitable for large-scale commercial use, such as automobile engine casings and transmission mechanism parts: gearbox housings, cylinder blocks, cylinder heads, intake / exhaust pipes, etc. Heat-resistant magnesium alloys lower than WE54 but lower in cost are a direction for the development of magnesium alloys

Method used

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  • Heat-resistant magnesium alloy and preparation method thereof
  • Heat-resistant magnesium alloy and preparation method thereof
  • Heat-resistant magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a heat-resistant magnesium alloy, the composition of which is: zinc Zn0.7Wt.%, zirconium Zr0.5Wt.%, rare earth neodymium Nd1.0Wt.%, rare earth yttrium Y2.3Wt.%, metal cobalt Co0.2Wt .%, metal molybdenum Mo0.2Wt.%, metal vanadium V0.5Wt.%; alkaline earth calcium Ca2.0Wt.%, alkaline earth strontium Sr0.2Wt.%, and the balance of Mg and unavoidable impurities in the casting process and / or modifying elements.

[0041] The preparation steps of the heat-resistant magnesium alloy are:

[0042] (1) Add Nd, Y, Ca, Sr and Mg to the smelting furnace respectively according to the composition and melt to prepare master alloys Mg-Ca, Mg-Sr, Mg-Nd and Mg-Y;

[0043] (2) Heat the crucible resistance furnace to 750-780°C, use graphite or stainless steel crucible to melt the magnesium ingot under the cover agent, and then add Mg-Ca, Mg-Sr, Mg-Nd, Mg-Y, Zn, Zr, Co, Mo and V, heat preservation at 750-780°C for ten minutes, pay attention to stirring the melt duri...

Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that the composition of the heat-resistant magnesium alloy is: zinc Zn0.5Wt.%, zirconium Zr0.6Wt.%, rare earth neodymium Nd1.3Wt.%, rare earth yttrium Y2.5Wt.%, metal Cobalt Co0.2Wt.%, metal molybdenum Mo0.2Wt.%, metal vanadium V0.5Wt.%; alkaline earth calcium Ca2.0Wt.%, alkaline earth strontium Sr0.2Wt.%, and the balance of Mg and unavoidable in the casting process impurities and / or modifying elements. The magnesium alloy ingot (without any treatment) prepared by the gas shielded melting casting method was subjected to a mechanical test, and the obtained mechanical performance indexes are shown in Table 2.

[0051] Table 2

[0052] Temperature T(°C) Yield strength σ s (MPa)

[0053] There is no obvious difference between Example 1 and Example 2 in room temperature and high temperature performance, the difference is that the content of rare earth Nd and rare earth Y in Example 1 is reduced, and th...

Embodiment 3

[0055] The difference between this embodiment and embodiment 1 is that the composition of the heat-resistant magnesium alloy is: zinc Zn0.7Wt.%, zirconium Zr0.6Wt.%, rare earth neodymium Nd2.0Wt.%, rare earth yttrium Y2.2Wt.%, metal Cobalt Co0.2Wt.%, metal molybdenum Mo0.2Wt.%, metal vanadium V0.5Wt.%; alkaline earth calcium Ca2.0Wt.%, alkaline earth strontium Sr0.2Wt.%, and the balance of Mg and unavoidable in the casting process impurities and / or modifying elements. The magnesium alloy ingot (without any treatment) prepared by the gas shielded melting casting method was subjected to a mechanical test, and the obtained mechanical properties are shown in Table 3, and the enlarged microstructure is shown in image 3 and Figure 4 , showing that after the appropriate increase of rare earth neodymium Nd and rare earth yttrium Y, the tensile strength at room temperature and high temperature has increased.

[0056] table 3

[0057] Temperature T(°C) Yield strength σ ...

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Abstract

The invention provides a heat-resistance magnesium alloy. The heat-resistance magnesium alloy comprises the following components including, by weight, 0.5-1.0% of zinc (Zn), 0.3-0.6% of zirconium (Zr), 1.0-1.3% of rare earth neodymium (Nd), 2.2-2.5% of rare earth yttrium (Y), 0.2% of metal cobalt (Co), 0.2% of metal molybdenum (Mo), 0.5% of metal vanadium (V), 2.0% of alkali earth calcium (Ca), 0.2% of alkali earth strontium (Sr), and the balance Mg and inevitable impurities and / or modified elements. Compared with a traditional rare earth magnesium alloy, the added alkali earth elements and rare earth elements achieve a synergistic effect; the alkali earth metal can make up the defects of rare earth compounds on the grain boundary strengthening; Mg-Ca compounds generated by Ca and Mg are distributed on the grain boundary to partially replace Mg24Y5 and Mg41Nd5 formed by magnesium and rare earth, so that the use level of the rare earth elements is obviously reduced; and the mechanical performances of the prepared magnesium alloy are improved compared with the prior art.

Description

technical field [0001] The invention relates to the field of preparation of new materials, in particular to the preparation of heat-resistant magnesium alloys, specifically heat-resistant cast magnesium alloys containing rare earth and alkaline earth elements and a preparation method thereof. Background technique [0002] Magnesium alloy is an alloy composed of magnesium and other elements. As a commercial metal engineering structural material, magnesium alloy is characterized by low density (1.8g / cm 3 About), high specific strength and specific stiffness, large specific modulus of elasticity, good heat dissipation, strong damping, vibration and noise reduction, good shock absorption, greater impact load capacity than aluminum alloy, good corrosion resistance to organic matter and alkali, Excellent electromagnetic shielding performance and easy recycling, it is known as the "green structural material" in the 21st century. The main alloying elements added to magnesium alloy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/06
Inventor 吴安如覃波陈娟
Owner 西安弘如材料科技有限公司
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