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Preparation of magnesium alloy with high strength and ductility

A magnesium alloy, high-strength technology, applied in the field of spray deposition preparation technology, can solve the problems of high equipment requirements, high production costs, and difficult control of the preparation process

Inactive Publication Date: 2008-10-08
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A careful analysis of the invention patent shows that, in addition to the high production cost, the preparation process is complicated and difficult to control, and the equipment requirements are extremely high.

Method used

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  • Preparation of magnesium alloy with high strength and ductility
  • Preparation of magnesium alloy with high strength and ductility
  • Preparation of magnesium alloy with high strength and ductility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] AZ31 magnesium alloy adopts the following preparation process:

[0015] (1) Preparation of magnesium alloy deposition billet by spray forming

[0016] First place the AZ31 magnesium alloy ingot in the smelting furnace, vacuum the induction furnace, wash the furnace with argon 3 times during this period, when the vacuum reaches 10Pa, fill the vacuum furnace with argon until the absolute value of the vacuum gauge scale is 0.03 When the smelting furnace is powered, the ingot is melted. After the alloy is melted and mixed evenly by electromagnetic stirring, the temperature is lowered to 750°C, poured into the tundish, and flowed out through the diversion nozzle. The high-pressure atomized gas N 2 Atomization, the atomized droplets are deposited on the receiving plate to form a columnar deposition blank. The ring-hole non-restricted atomizing nozzle is adopted, and the specific process parameters are as follows: the atomizing pressure is 0.55MPa, the outlet diameter of the ...

Embodiment 2

[0021] AZ91 magnesium alloy adopts the following preparation process:

[0022] (1) Preparation of magnesium alloy deposition billet by spray forming

[0023] First place the AZ91 magnesium alloy ingot in the smelting furnace, vacuum the induction furnace, wash the furnace 3 times with argon during this period, when the vacuum reaches 30Pa, fill the vacuum furnace with argon until the absolute value of the vacuum gauge scale is 0.03 When the smelting furnace is powered, the ingot is melted. After the alloy is melted and mixed evenly by electromagnetic stirring, it is cooled to 720°C, poured into the tundish, and flows out through the diversion nozzle. The high-pressure atomized gas N 2 Atomization, the atomized droplets are deposited on the receiving plate to form a columnar deposition blank. The ring-hole non-restricted atomizing nozzle is adopted, and the specific process parameters are as follows: the atomization pressure is 0.6MPa, the outlet diameter of the diversion nozz...

Embodiment 3

[0028] Mg-9.0wt.%Al-1.8wt.%Zn alloy adopts the following preparation process:

[0029] (1) Preparation of magnesium alloy deposition billet by spray forming

[0030] First place the AZ91 magnesium alloy ingot in the smelting furnace, vacuum the induction furnace, wash the furnace twice with argon during this period, and when the vacuum reaches 50Pa, fill the vacuum furnace with argon until the absolute value of the vacuum gauge scale is 0.04 At the same time, power is supplied to the melting furnace to melt the ingot. After the alloy is melted, other alloy ingredients (pure zinc block) are added to the melting furnace through the feeding device equipped with the vacuum furnace. Pour into the tundish, flow out through the diversion nozzle, high-pressure atomizing gas N 2 Atomization, the atomized droplets are deposited on the receiving plate to form a columnar deposition blank. The ring-hole non-restricted atomizing nozzle is used, and the specific process parameters are as f...

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Abstract

A preparation method of a high-strength magnesium alloy relates to a spray deposition preparation process and proposes the spray forming technology which adopts protective atmosphere, thus solving the problems of volatilization, oxidation and safety etc. of the magnesium alloy, preparing a magnesium alloy deposition blank with complete shape, low segregation, high density and qualified components and ensuring the macro-mechanical properties of Mg-Al-Zn alloy and the plastic deformation capacity to be synchronously improved. The method is that firstly, an alloy ingot is arranged in a melting furnace, the vacuum extraction is carried out, the furnace is washed by argon for 2 to 3 times, when the vacuum degree is 10 to 70 Pa, the argon is filled till the pressure is slightly lower than the outside atmospheric pressure, the ingot is melted, electromagnetically stirred and evenly mixed, after that, the ingot is poured to a middle package when the temperature of the melt is 700 to 770 DEG C and is flown out by a flow guide nozzle, an annular hole type non-limited atomizing nozzle is adopted for high-pressure atomizing N2 gas, the atomization pressure is 0.5 to 0.6MPa, and atomized liquid is deposited on a receiving polar plate to form the columnar magnesium alloy deformation blank. The strength and the toughness of the magnesium alloy material prepared by the invention are both in better levels, thus realizing the synchronous improvement of the strength and the toughness.

Description

technical field [0001] The invention relates to a spray deposition preparation process, provides a new method for improving the structure of a magnesium alloy and improving its strength and toughness, and relates to the technical fields of metal materials, metallurgy and plastic processing. Background technique [0002] With the deepening of the application of magnesium alloys in the fields of aviation, aerospace, shipbuilding, transportation, military industry and high-tech industries, the requirements for the performance of magnesium alloys are getting higher and higher. How to improve the comprehensive performance of magnesium alloys to meet the use of structural materials Requirements become the focus and difficulty of current magnesium alloy research. Mg-Al-Zn alloys are the most widely used industrial alloy series in magnesium alloys. Under the traditional ingot metallurgy (IM) process conditions, due to unbalanced crystallization, brittle Mg 17 al 12 Intermetallic c...

Claims

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Application Information

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IPC IPC(8): B22D23/00C22C23/00
Inventor 张济山李永兵崔华蔡元华段先进
Owner UNIV OF SCI & TECH BEIJING
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