Superplastic magnesium alloy and preparation method thereof

A magnesium alloy and superplastic technology, applied in the field of magnesium alloys, can solve the problems of poor high temperature mechanical properties, poor mechanical properties of alloys, and weak, and achieve the effects of excellent superplasticity, excellent superplasticity, and outstanding superplasticity.

Active Publication Date: 2014-09-03
北京二七铁丰龙科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, although this type of alloy is cheap and rich in resources, the mechanical properties of this type of alloy are poor, especially its high-temperature mechanical properties are even worse, so it cannot be used to prepare key load-bearing parts or parts used at high temperatures
On the other hand, a large number of low-melting second phases (mainly Mg-Al and Mg-Zn phases) inevitably exist in this type of alloy, and they cannot exist in the alloy as effective stable particles. conditions have softened
The lack of stable particles will inevitably lead to the coarsening of alloy grains and the suppression of dynamic recrystallization (PSN mechanism) under high-temperature plastic working conditions, which seriously damages the high-strain superplastic forming ability of such magnesium alloys.
(2) The current research on the superplastic behavior of Mg-Zn-RE (rare earth) alloys is relatively weak, relatively concentrated on Mg-Zn-Y alloys, and other Mg-Zn-RE alloys other than Y elements less research
There are relatively few studies on superplastic deformation at lower temperatures, and there are no reports of alloy materials with superplasticity at lower temperatures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Now remove the scale layer of Mg-Er master alloy, pure Zn and pure magnesium, etc., and weigh the ingredients, in which the content of Zn is 10%, and the ratio of Zn / Er in the prefabricated alloy is 1:1. Place the divided master alloy, pure Zn and pure magnesium in a heating furnace for preheating, the preheating temperature is 200° C., and keep warm for 1 hour. Transfer the preheated master alloy to a mild steel crucible, and 6 / CO 2 Melting is carried out under the protection of mixed gas. First, set the melting temperature to 720°C, wait for the alloy to melt, keep it warm for 5 minutes, then stir and remove the scale on the surface of the alloy liquid, then lower the furnace temperature to 680°C, add Mg, stir and remove slag after the magnesium is melted, keep warm 5min. Continue to lower the furnace temperature to 650°C, add Zn, stir and remove slag after melting. Then the furnace temperature was raised to 720°C, the alloy liquid was stirred and slag removed, a...

Embodiment 2

[0033] Now remove the scale layer of the Mg-Er master alloy, pure Zn and pure magnesium, and weigh the ingredients. The ratio of Zn / Er in the prefabricated alloy is 1.5:1, and the content of Zn is 15%. Place the divided master alloy, pure Zn and pure magnesium in a heating furnace for preheating, the preheating temperature is 200° C., and keep warm for 1 hour. Transfer the preheated master alloy to a mild steel crucible, and 6 / CO 2 Melting is carried out under the protection of mixed gas. First, set the melting temperature to 730°C, wait for the alloy to melt, keep it warm for 10 minutes, then stir and remove the scale on the surface of the alloy liquid, then lower the furnace temperature to 700°C, add Mg, stir and remove slag after the magnesium is melted, keep warm 5min. Continue to lower the furnace temperature to 650°C, add Zn, stir and remove slag after melting. Then the furnace temperature was raised to 730°C, the alloy liquid was stirred and slag removed, and fina...

Embodiment 3

[0041] Now remove the scale layer of the Mg-Er master alloy, pure Zn and pure magnesium, and weigh the ingredients. The ratio of Zn / Er in the prefabricated alloy is 2:1, and the content of Zn is 30%. Place the divided master alloy, pure Zn and pure magnesium in a heating furnace for preheating, the preheating temperature is 200° C., and keep warm for 1 hour. Transfer the preheated master alloy to a mild steel crucible, and 6 / CO 2 Melting is carried out under the protection of mixed gas. First, set the melting temperature to 750°C, wait for the alloy to melt, keep it warm for 15 minutes, then stir and remove the scale on the surface of the alloy liquid, then lower the furnace temperature to 720°C, add Mg, stir and remove slag after the magnesium is melted, keep warm 15min. Continue to lower the furnace temperature to 680°C, add Zn, stir and remove slag after melting. Then raise the furnace temperature to 740°C, stir the alloy liquid and remove slag, and finally keep it at...

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PUM

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Abstract

The invention relates to a superplastic magnesium alloy and a preparation method thereof and belongs to the technical field of magnesium alloys. The magnesium alloy comprises the following components in percentage by weight: 10-30wt.% of Zn, 10-15wt.% of Er, and the balance of Mg, wherein Zn and Er are taken as main alloying elements and the ratio of Zn/Er is 1-2. The magnesium alloy is prepared by a melting process and an extruding process. The alloy has good plasticity at an initial strain rate of 0.5-5mm/min at 100-150 DEG C and shows good superplasticity in a low temperature range from 175 to 300 DEG C. The alloy is a potential magnesium alloy material which can be applied to superplastic forming and processing.

Description

technical field [0001] The invention relates to a low-temperature superplastic Mg-Zn-Er alloy and a preparation method thereof, in particular to preparation through certain alloy components, smelting process and extrusion conditions. The alloy has significant superplasticity in a lower temperature range, is a superplastically formable magnesium alloy material with potential application prospects, and belongs to the technical field of magnesium alloys. Background technique [0002] In the 21st century, resource shortage and environmental degradation have become the primary issues affecting the sustainable development of human beings. Compared with the increasingly depleted metal mineral resources, magnesium has more advantages in the effective and environmentally friendly use of resources due to its abundant reserves. Similarly, magnesium alloy, as the lightest energy-saving and environmentally friendly structural material, has extremely important industrial value and applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C23/00C22C1/03C22F1/06
Inventor 刘轲杜文博王朝辉李淑波
Owner 北京二七铁丰龙科技有限公司
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