Multi-nanophase composite enhanced magnesium alloy and preparation method thereof

A composite reinforcement, nano-phase technology, applied in the field of magnesium alloys, can solve the problems of unformed, coarse LPSO structure, complex LPSO structure, etc., and achieve the effect of inhibiting grain coarsening and outstanding mechanical properties

Active Publication Date: 2016-04-20
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

It can be seen that the structure of LPSO in Mg-RE alloys containing Zn is more complex, and its regulation process needs to be more precise
However, the current research shows that the primary LPSO structure is coarse and unevenly distributed. Although the LPSO structure precipitated during heat treatment is fine, it is unevenly distributed and not formed. The key lies in the problems of alloy composition, heat treatment process and extrusion process.

Method used

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  • Multi-nanophase composite enhanced magnesium alloy and preparation method thereof
  • Multi-nanophase composite enhanced magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Now remove the scale layer of Mg-Gd master alloy, pure Zn and pure magnesium, and weigh the ingredients. Smelting in a resistance to obtain a rough cast ingot with a composition of Mg-10Gd-1Zn and a diameter of 130mm, solution treatment at a high temperature of 520°C, a holding time of 15h, water quenching at 70°C, and then turning Processing to obtain an extrusion blank with a diameter of 90 mm. The extruded billet was forward extruded on a 630-ton horizontal extruder at 500° C. to obtain a rod with a diameter of 35 mm. The obtained extruded rods are heat treated to promote the first precipitation of the high temperature phase. The heat treatment temperature is 450°C and the holding time is 100h, and then the extruded blank is subjected to secondary reverse extrusion on a 200-ton vertical extruder. pressure. The secondary extrusion temperature is 300° C., and the rod diameter obtained after extrusion is 15 mm. The rod with a diameter of 15mm was first subjected to h...

Embodiment 2

[0033] Now remove the scale layer of Mg-Gd master alloy, pure Zn and pure magnesium, and weigh the ingredients. Smelting in a resistance to obtain a rough cast ingot with a composition of Mg-15Gd-1Zn and a diameter of 130mm, solution treatment at a high temperature of 550°C, a holding time of 5h, water quenching at 70°C, and then turning Processing to obtain an extrusion blank with a diameter of 120 mm. The extruded billet was forward extruded on a 630-ton horizontal extruder at 450° C. to obtain a rod with a diameter of 55 mm. The obtained extruded bar is subjected to heat treatment to promote the first precipitation of the high-temperature phase. The heat treatment temperature is 520°C and the holding time is 10h, and then the extruded blank is subjected to secondary reverse extrusion on a 200-ton vertical extruder pressure. The secondary extrusion temperature is 425° C., and the rod diameter obtained after extrusion is 15 mm. The rod with a diameter of 15 mm was first su...

Embodiment 3

[0035] Now remove the scale layer of Mg-Gd master alloy, pure Zn and pure magnesium, and weigh the ingredients. Smelting in a resistance to obtain a rough cast ingot with a composition of Mg-20Gd-2.5Zn and a diameter of 130mm, solution treatment at a high temperature of 535°C, a holding time of 10h, water quenching at 70°C, and then Turning processing to obtain an extruded blank with a diameter of 110 mm. The extruded billet was forward extruded on a 630-ton horizontal extruder at 450° C. to obtain a rod with a diameter of 45 mm. The obtained extruded bar is subjected to heat treatment to promote the first precipitation of the high-temperature phase. The heat treatment temperature is 500°C, and the holding time is 25 hours. Then, the extruded blank is subjected to secondary reverse extrusion on a 200-ton vertical extruder. pressure. The secondary extrusion temperature is 425° C., and the diameter of the rod obtained after extrusion is 10 mm. The rod with a diameter of 10mm ...

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Abstract

The invention discloses multi-nanophase composite enhanced magnesium alloy and a preparation method thereof, and belongs to the technical field of magnesium alloy. The multi-nanophase composite reinforced and enhanced deforming magnesium alloy is Mg-Gd-Zn alloy, wherein the Gd content is 10-25 wt%, the Zn content is 1-5 wt%, the balance is Mg, and the difference between the mass percent of GD and the mass percent of Zn is not smaller than 8. The deforming magnesium alloy material excellent in mechanical performance is obtained through the multi-stage extrusion and multi-stage thermal treatment process, the yield strength can reach 250-400 MPa, and the elongation can reach 10-25%. The alloy is mainly reinforced by a nanometer needle-shaped phase and a nanometer sheet phase together, the two phases are staggered, and the comprehensive mechanical performance of the alloy can be remarkably improved.

Description

technical field [0001] The invention relates to a multi-nano-phase composite reinforced magnesium alloy and its preparation technology, in particular to a new method and a new process for preparing the alloy, belonging to the technical field of magnesium alloys. Background technique [0002] With the continuous development of social economy, the demand and consumption of metal materials are increasing day by day. Magnesium has a huge advantage due to its abundant reserves, and the abundant magnesium ore resources provide the most reliable resource guarantee for the sustainable development of my country's magnesium industry. Magnesium is the lightest metal structure material, its density is only 1.74g / cm 3 , only equivalent to 2 / 3 of aluminum and 1 / 4 of steel. At the same time, magnesium alloy also has the advantages of high specific strength, good thermal and electrical conductivity, damping and vibration reduction, electromagnetic shielding, easy machining and easy recycl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/06C22F1/002C22F1/06
Inventor 刘轲杜文博李莉莉
Owner 北京二七铁丰龙科技有限公司
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