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Casting heat-resistant magnesium alloy

A magnesium alloy and heat-resistant technology, which is applied in the field of light metal materials and cast heat-resistant magnesium alloys, can solve the problems of low product stability, increased thermal cracking tendency, difficult processing deformation, etc., and achieves convenient operation and slow strength decline , the effect of good mechanical properties

Inactive Publication Date: 2007-10-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of alloy is characterized by high rare earth content and good heat resistance. The long-term use temperature is above 120°C, but the casting process is difficult to control, the product stability is low, and the plasticity is poor, so it is difficult to process and deform.
In addition, there are AS series (such as AS41; Mg-4Al-1Si), which have the advantages of low cost, high plasticity, and better heat resistance than general magnesium alloys such as AZ91, but due to the low aluminum content, the casting performance is poor, and its strengthening phase Mg 2 Si will form thick "Chinese characters" under the condition of slow solidification, so that the tensile strength and yield strength of the alloy are lower
In recent years, researchers in Japan and the United States have researched and developed some magnesium alloys containing Ca, such as ZAC8506 (Mg-8Zn-5Al-0.6Ca) in the United States, Mg-2Zn-0.8Ca-2Mn-0.5Zr in Japan, etc. It is said that the creep resistance performance reaches or exceeds that of AE42 and other rare earth magnesium alloys, but with the addition of Ca, the grains of the alloy become coarser, and the tendency of thermal cracking increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Components and weight percentages of the heat-resistant magnesium alloy: Gd: 5%; Mn: 1.0%; Sc: 0.5%; the balance is magnesium and unavoidable impurities in the casting process. The mechanical properties of the alloy are as follows:

[0015] At 25°C, tensile strength: 148.65Mpa, yield strength: 101.12Mpa, elongation: 6.44%

[0016] At 200°C, tensile strength: 155.18Mpa, yield strength: 110.05Mpa, elongation: 12.43%

[0017] At 250°C, tensile strength: 150.24Mpa, yield strength: 108.2Mpa, elongation: 12.95%

[0018] At 300°C, tensile strength: 136.28Mpa, yield strength: 96.95Mpa, elongation: 13.68%

Embodiment 2

[0020] Components and weight percentages of the heat-resistant magnesium alloy: Gd: 10%; Mn: 1%; Sc: 0.3%; the balance is magnesium and unavoidable impurities in the casting process. After the alloy is heat-preserved for 6 hours at 500°C for solid solution, and then aged at 250°C for 16 hours, its mechanical properties are as follows:

[0021] At 25°C, tensile strength: 210.78Mpa, yield strength: 170.82Mpa, elongation: 4.28%

[0022] At 200°C, tensile strength: 228.08Mpa, yield strength: 185.35Mpa, elongation: 5.20%

[0023] At 250°C, tensile strength: 211.34Mpa, yield strength: 165.32Mpa, elongation: 6.31%

[0024] At 300°C, tensile strength: 186.23Mpa, yield strength: 142.77Mpa, elongation: 6.91%

Embodiment 3

[0026] The composition and weight percentage of the heat-resistant magnesium alloy: Gd: 7%; Mn: 1.0%; Sc: 0.8%; the balance is magnesium and unavoidable impurities in the casting process. The mechanical properties of the alloy are as follows:

[0027] At 25°C, tensile strength: 180.65Mpa, yield strength: 150.82Mpa, elongation: 5.28%

[0028] At 200°C, tensile strength: 191.08Mpa, yield strength: 156.35Mpa, elongation: 6.18%

[0029] At 250°C, tensile strength: 186.34Mpa, yield strength: 147.32Mpa, elongation: 6.81%

[0030] At 300°C, tensile strength: 161.23Mpa, yield strength: 122.77Mpa, elongation: 7.11%

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Abstract

The invention discloses a casting heat-proof magnesium alloy material in the light metal material domain, which comprises the following parts: 5%-10% gadolinium, 0. 5%-1. 0% manganese, 0. 3%-0. 8% scandium and residual magnesium, wherein Gd is main alloy element, which can form stable Mg-Gd compound under high temperature; Mn and Sc can form Mn2Sc in the heat disposing course; the property of alloy possesses dynamic property under normal temperature, which reduces the strength of the alloy slowly under 200-300 deg. c to satisfy aviation and automobile industry.

Description

technical field [0001] A cast heat-resistant magnesium alloy relates to a light metal material, especially a cast heat-resistant magnesium alloy material. technical background [0002] As the lightest structural metal material, magnesium alloy has significantly higher specific strength than aluminum alloy and steel, and its specific stiffness is comparable to aluminum alloy and steel but much higher than engineering plastics. At present, automobiles, rail transit, and aviation industry have become the largest fields of application of magnesium alloys. However, when the temperature of general magnesium alloys exceeds 120°C, their high-temperature strength and creep strength will drop significantly, which limits the application of magnesium alloys in automotive engines and transmissions. Components (such as gearbox housings, cylinder blocks, cylinder heads, intake / exhaust pipes) and aircraft engine casings and other applications in the transportation and aerospace fields, for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06
Inventor 姚素娟褚丙武梁冬梅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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