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Wrought magnesium alloy with high intensity and method for preparing its extruded material

A technology for deforming magnesium alloys and magnesium alloys, applied in metal extrusion dies and other directions, can solve the problems of expensive alloy materials, inability to prepare large-sized materials, hot cracking, etc., and achieve the effect of high surface quality

Active Publication Date: 2012-03-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Improving the strength of magnesium alloy materials is generally achieved through the following methods: one is to adopt complex preparation processes, such as rapid solidification process and strong deformation process, etc.; the other is to achieve through particle or fiber reinforced composite materials, but both exist The problem of not being able to prepare large-scale materials
At present, the high-strength magnesium alloys that can be used as structural materials are all realized by high-rare-earth alloying, but the problem that follows is that the alloy materials are expensive, except for a small amount of military use, civilian use is almost impossible, and there are also significant increases in density and plasticity. Problems such as hot cracking and segregation caused by large volume solidification caused by poor and high alloying

Method used

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  • Wrought magnesium alloy with high intensity and method for preparing its extruded material
  • Wrought magnesium alloy with high intensity and method for preparing its extruded material
  • Wrought magnesium alloy with high intensity and method for preparing its extruded material

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Embodiment 1

[0038] Using a resistance melting furnace, under the protection of the No. 5 flux, the metal magnesium is heated to 730°C to melt. According to the mass percentage of the magnesium alloy, 4% Zn, 3% Cu and 0.4% Y are added, and hexachloroethyl Alkanes and No. 5 flux are used to purify the magnesium alloy melt, and the melt is cooled to 670°C after stirring. 6 with CO 2 Under the protective atmosphere of mixed gas with a volume ratio of 1:10, magnesium alloy ingots were prepared by low-frequency electromagnetic oil-lubricated semi-continuous casting. The applied electromagnetic conditions were: electromagnetic frequency 30Hz, ampere-turns 6000AT, casting speed 140mm / min, water volume It is 70L / min, and the magnesium alloy ingot whose size is 165mm in diameter and 1800mm in height is obtained by chemical analysis and is annealed at 410±10°C for 10h; 50mm, 120mm high sample heated to 180 ° C, heat preservation for 2 hours, will be as attached image 3The extrusion cylinder, ext...

Embodiment 2

[0042] Using a resistance melting furnace, under the protection of No. 5 flux, the metal magnesium is heated to 730°C and melted. According to the mass percentage of the magnesium alloy, 4% of Zn, 3% of Cu, 0.2% of Y, and 0.6% of Zr are added. , using hexachloroethane and No. 5 flux to purify the magnesium alloy melt, the melt was cooled to 665°C after stirring, and the 6 with CO 2 Under the protective atmosphere of mixed gas with a volume ratio of 1:10, magnesium alloy ingots were prepared by low-frequency electromagnetic oil-lubricated semi-continuous casting. The applied electromagnetic conditions were: electromagnetic frequency 30Hz, ampere-turns 6000AT, casting speed 140mm / min, water volume It is 70L / min, and the magnesium alloy ingot with a diameter of 165mm and a height of 1800mm is obtained, and the chemical analysis composition is Mg-3.48Zn-3.23Cu-0.212Y-0.547Zr, annealed at 410±10°C for 10h, and peeled off after the annealing is completed ; Get a diameter of 50mm a...

Embodiment 3

[0046] Using a resistance melting furnace, under the protection of No. 5 flux, the metal magnesium is heated to 740°C to melt. According to the mass percentage of the magnesium alloy, 4% Zn, 3% Ni, 0.4% Y are added, and hexachloroethane and No. 5 flux is used to purify the magnesium alloy melt, and the melt is cooled to 680°C after stirring. 6 with CO 2 Under the protective atmosphere of mixed gas with a volume ratio of 1:10, magnesium alloy ingots were prepared by low-frequency electromagnetic oil-lubricated semi-continuous casting. The applied electromagnetic conditions were: electromagnetic frequency 30Hz, ampere-turns 6000AT, casting speed 140mm / min, water volume It is 70L / min, and the obtained specification is a magnesium alloy ingot with a diameter of 165mm and a height of 1800mm, and the chemical analysis composition is Mg-4.01Zn-2.98Ni-0.370Y, annealed at 410±10°C for 10h; peel off the skin after annealing ends; take the diameter 50mm, 120mm high sample heated to 180...

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Abstract

The invention belongs to the metal material technical field and the metallurgy technical field, and concretely relates to a wrought magnesium alloy with high intensity and a method for preparing an extruded material. The wrought magnesium alloy with high intensity is a Mg-Zn-(Cu or Ni)-RE-based magnesium alloy, which comprises the following ingredients by mass percentage: 2.0%-6.0% of Zn, 1.5%-6.0% of Cu or Ni, 0.1%-0.5% of Y, Nd, Gd, Ce or MM, 0-0.8% of Zr and the balance of Mg, wherein the content of impurity Fe is less than 0.005% and the density is (1.84-1.86) *10<3>kg / m<3>. The method ischaracterized in that a magnesium alloy ingot blank is semi-continuous casted by using low frequency electromagnetic oil lubrication, then performed reverse temperature extrusion and T5 heat treatment to obtain the extruded material of the wrought magnesium alloy with high intensity. The density of the extruded material of the Mg-Zn-(Cu or Ni)-RE-based magnesium alloy is (1.84-1.86) *10<3>kg / m<3>, the room temperature tensile mechanical properties after T5 heat treatment is carried out are that: the tensile strength is 390-420MPa, the yield strength ratio is greater than 0.96, the elongation percentage is greater than 7%.

Description

technical field [0001] The invention belongs to the field of metal material technology and metallurgy technology, and in particular relates to a high-strength deformed magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, excellent vibration damping, electromagnetic shielding and machinability, and is an ideal material for lightweight structures. In recent years, the research and application of magnesium alloys have been highly valued. However, magnesium alloys also have problems such as difficult melting and casting, low strength, poor plasticity, heat resistance and corrosion resistance. Among them, low strength and easy yield deformation are an important reason for the limited application of magnesium alloys. Therefore, magnesium Alloys can generally only be used as secondary force-bearing parts, which seriously restricts their application fields. At present, the general-...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C23/00C22F1/06B21C23/20B21C25/02B21C23/32
Inventor 乐启炽张志强崔建忠
Owner NORTHEASTERN UNIV
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