Yb-containing deformation magnesium alloy and dynamic precipitation strengthening-toughening preparation thereof

A deformed magnesium alloy, strengthening and toughening technology, applied in the field of metal material strengthening and processing, can solve the problems of insignificant strengthening effect, difficulty in obtaining precipitation strengthening effect, single strengthening and toughening effect, etc.

Inactive Publication Date: 2009-04-15
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alloying method is mainly to use various rare earth elements and Sn, Cu, Ag, etc. to alloy magnesium or to modify the existing Mg-Al and Mg-Zn series magnesium alloys, although many elements have been found to be effective on magnesium and magnesium. Alloys have a certain strengthening effect, but the strengthening effect is not significant, especially the plastic deformation ability of magnesium alloys cannot be significantly improved or even deteriorated. Therefore, special processing technologies for magnesium alloys have received extensive attention, such as ECAE and other large plastic deformation technologies. , semi-solid extrusion, reciprocating extrusion, hydrostatic extrusion, low temperature extrusion and rapid solidification-powder metallurgy-hot extrusion, etc. These methods can indeed obtain high mechanical properties and superplastic deformation capabilities, but they are all due to It is difficult to put into application due to their special manufacturing, efficiency and cost issues
[0005] The essence of the above problems is that these technical methods have the problem of single strengthening and toughening effects. For example, the alloying method pursues the second phase strengthening effect, but because no satisfactory dispersed precipitate has been found, especially after deformation processing, the

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  • Yb-containing deformation magnesium alloy and dynamic precipitation strengthening-toughening preparation thereof
  • Yb-containing deformation magnesium alloy and dynamic precipitation strengthening-toughening preparation thereof

Examples

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Example Embodiment

[0032] Example 1: Melt magnesium ingots in a resistance heating furnace, then add Mg-Zr alloy containing 1.5% of the total mass of the materials added in this step at 770°C, and stir for 6min to boost under solvent protection, then Add Mg-Yb alloy with Yb content of 2.0% of the total mass of the materials added in this step at 750°C, stir for 4 minutes to boost, and finally add 6.0% of the total mass of zinc ingots in this step at 730°C, and stir for 1 minute to boost. After standing at 730°C for 15 minutes, the slag was removed and the ingot was poured. Place the ingot in a resistance heating temperature-controlled heat treatment furnace, pass SO 2 After the gas is kept at 380°C for 20 hours, the temperature is then raised to 420°C for 6 hours, and then it is discharged out of the furnace to cool naturally; the homogenized ingot is removed from the 2mm outer skin by the machine tool cart, and then placed in the temperature control at 370°C Preheated in the extrusion die for 20 mi...

Example Embodiment

[0033] Example 2: Melt magnesium ingots in a resistance heating furnace, then add Mg-Zr alloy containing 2.0% of the total mass of the materials added in this step at 780°C, and stir for 5min to boost the flux under solvent protection conditions. Add the Mg-Yb alloy containing 0.5% of the total mass of the materials added in this step at 740°C, stir for 3min to boost the flux, and finally add 5% of the total mass of the zinc ingots added in this step at 740°C, stir for 2min to boost the flux, After standing for 20 minutes at 740°C, the slag was removed and the ingot was poured. Place the ingot in a resistance heating temperature-controlled heat treatment furnace. After keeping it at 340°C for 16 hours, it is then heated to 405°C for 10 hours, and then taken out of the furnace and placed in a water tank for cooling; the solution treated ingot is removed by a machine tool by 1mm The outer skin is then placed in an extrusion die with a temperature controlled at 320°C for 30 minutes t...

Example Embodiment

[0034]Example 3: Melt magnesium ingots in a resistance heating furnace, then add Mg-Zr alloy containing 1.8% of the total mass of the materials added in this step at 750°C, and stir for 10 min to boost under gas protection, and then Add Mg-Yb alloy with Yb content 0.2% of the total mass of the materials added in this step at 760°C, stir for 5min to boost, and finally add 7% zinc ingots of the total mass of the materials added in this step at 750°C, stir for 3min to boost, After standing at 750°C for 10 minutes, the slag was removed and the ingot was poured. Place the ingot in a resistance heating temperature-controlled heat treatment furnace, keep it at 330°C for 24 hours, then heat it up to 400°C for 4 hours, then take it out of the furnace and put it into the water tank for cooling; remove the solution-treated ingot by 1mm with a machine tool The outer skin is then placed in an extrusion die with a temperature controlled at 380°C for 15 minutes. The extrusion process is carried ...

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Abstract

The invention discloses deformed magnesium alloy containing Yb and a dynamic separation strengthening and toughening preparation method thereof. A strengthening phase is effectively dispersed and separated out during a deformation process by selecting a special alloy element and utilizing the universal homogenization treatment and thermal squeezing technologies during the production of the deformed magnesium alloy, thereby obtaining the compound strengthening and toughening effects of deformation strengthening, refined crystalline strengthening and precipitation hardening of the deformed magnesium alloy; the obtained high intensity deformed magnesium alloy simultaneously has the characteristics of refined crystalline strengthening, separation strengthening, intercrystalline strengthening and deformed substructure strengthening, thereby obtaining very high mechanical property; the tensile strength is larger than 380MPa; the yield strength is larger than 320MPa; and the percentage of elongation is larger than 5 percent.

Description

technical field [0001] The invention relates to the technical field of metal material strengthening and processing, in particular to a production method of a high-strength deformed magnesium alloy, in particular to a Yb-containing deformed magnesium alloy and a preparation method thereof for dynamic precipitation strengthening and toughening. Background technique [0002] Magnesium alloy is currently a lightweight metal material that is highly valued at home and abroad. It has broad application prospects in the production of automobiles, aerospace, and electromechanical and electronic products. It is an ideal lightweight substitute for steel and aluminum alloy materials. Known as "the green material of the 21st century", it is of great significance to solve or alleviate the energy crisis and environmental crisis that the world is facing now. [0003] However, due to the inherent atomic structure and crystal arrangement characteristics of magnesium alloys, their low strength ...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C1/02C22F1/06
Inventor 于文斌
Owner SOUTHWEST UNIVERSITY
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